69
69
Jul 20, 2013
07/13
by
Dmitry Bizyaev; Serafim Kajsin
texts
eye 69
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We present surface photometry results for a sample of eleven edge-on galaxies observed with the 6m telescope at the Special Astrophysical Observatory (Russia). The photometric scale length, scale height, and central surface brightness of the stellar disks of our sample galaxies are estimated. We show that four galaxies in our sample, which are visually referred as objects of the lowest surface brightness class in the Revised Flat Galaxies Catalog, have bona fide low surface brightness (LSB)...
Source: http://arxiv.org/abs/astro-ph/0406498v1
55
55
Sep 17, 2013
09/13
by
Dmitry Bizyaev; Sofija Mitronova
texts
eye 55
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To analyze the vertical structure of edge-on galaxies, we have used images of a large uniform sample of flat galaxies that have been taken during the 2MASS all-sky survey. The photometric parameters, such as the radial scale length, the vertical scale height, and the deprojected central surface brightness of galactic disks have been obtained. We find a strong correlation between the central surface brightness and the ratio of the vertical scale height to the vertical scale length: the thinner...
Source: http://arxiv.org/abs/astro-ph/0207539v1
42
42
Sep 18, 2013
09/13
by
Dmitry Bizyaev; Serafim Kajsin
texts
eye 42
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We present results of surface photometry for eleven edge-on galaxies observed with the 6-m telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences. The photometric scale length, the scale height, and the central surface brightness of the stellar disks for the galaxies were found using photometric cuts made parallel to the major and the minor axes for each galaxy. We show that four galaxies in our sample that were visually classified as objects of lowest surface...
Source: http://arxiv.org/abs/astro-ph/0306190v1
41
41
Sep 22, 2013
09/13
by
Dmitry Bizyaev; Verne V. Smith
texts
eye 41
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The GGSS is a partially-filled, all-sky survey to identify K-giant stars with low level of RV-variability. We study histograms of the radial velocity (RV) variability obtained in the early phase of the Grid Giant Star Survey (GGSS, Bizyaev et al., 2006). This part of the survey has been conducted with a very limited nubmer of observations per star, and rough accuracy. We apply the Monte-Carlo simulations to infer a fraction of the RV-stable stars in the sample. Our optimistic estimate is that...
Source: http://arxiv.org/abs/astro-ph/0702318v1
47
47
Sep 21, 2013
09/13
by
Dmitry Bizyaev; Verne V. Smith; Katia Cunha
texts
eye 47
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We present results of high resolution (~ 55000) spectral observations of 830 photometrically pre-selected candidate red giants in the magnitude range of V = 9-12. We develop a pipeline for automated determination of the stellar atmospheric parameters from these spectra and estimate T_eff, logg, [Fe/H], microturbulence velocity, and projected rotational velocities, vsini, for the stars. The analysis confirms that the candidate selection procedure yielded red giants with very high success rate....
Source: http://arxiv.org/abs/1011.0744v1
83
83
Sep 23, 2013
09/13
by
Joleen K. Carlberg; Steven R. Majewski; Phil Arras; Verne V. Smith; Katia Cunha; Dmitry Bizyaev
texts
eye 83
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We have computed the fate of exoplanet companions around main sequence stars to explore the frequency of planet ingestion by their host stars during the red giant branch evolution. Using published properties of exoplanetary systems combined with stellar evolution models and Zahn's theory of tidal friction, we modeled the tidal decay of the planets' orbits as their host stars evolve. Most planets currently orbiting within 2 AU of their star are expected to be ingested by the end of their stars'...
Source: http://arxiv.org/abs/1012.1876v1
39
39
Sep 22, 2013
09/13
by
Joleen K. Carlberg; Steven R. Majewski; Richard J. Patterson; Dmitry Bizyaev; Verne V. Smith; Katia Cunha
texts
eye 39
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We present the results of a search for unusually rapidly rotating giant stars in a large sample of K giants (~1300 stars) that had been spectroscopically monitored as potential targets for the Space Interferometry Mission's Astrometric Grid. The stars in this catalog are much fainter and typically more metal-poor than those of other catalogs of red giant star rotational velocities, but the spectra generally only have signal-to-noise (S/N) of ~20-60, making the measurement of the widths of...
Source: http://arxiv.org/abs/1103.1387v1
59
59
Sep 18, 2013
09/13
by
Jacob L. Bean; Barbara E. McArthur; G. Fritz Benedict; Thomas E. Harrison; Dmitry Bizyaev; Edmund Nelan; Verne V. Smith
texts
eye 59
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We have determined a dynamical mass for the companion to HD 33636 which indicates it is a low-mass star instead of an exoplanet. Our result is based on an analysis of Hubble Space Telescope (HST) astrometry and ground-based radial velocity data. We have obtained high-cadence radial velocity measurements spanning 1.3 years of HD 33636 with the Hobby-Eberly Telescope at McDonald Observatory. We combined these data with previously published velocities to create a data set that spans nine years. We...
Source: http://arxiv.org/abs/0705.1861v2
96
96
Sep 24, 2013
09/13
by
Kevin C. Schlaufman; Constance M. Rockosi; Young Sun Lee; Timothy C. Beers; Carlos Allende Prieto; Valery Rashkov; Piero Madau; Dmitry Bizyaev
texts
eye 96
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We find that the relative contribution of satellite galaxies accreted at high redshift to the stellar population of the Milky Way's smooth halo increases with distance, becoming observable relative to the classical smooth halo about 15 kpc from the Galactic center. In particular, we determine line-of-sight-averaged [Fe/H] and [alpha/Fe] in the metal-poor main-sequence turnoff (MPMSTO) population along every Sloan Extension for Galactic Understanding and Exploration (SEGUE) spectroscopic line of...
Source: http://arxiv.org/abs/1202.2360v1
52
52
Sep 23, 2013
09/13
by
Ana Bonaca; Mario Juric; Zeljko Ivezic; Dmitry Bizyaev; Howard Brewington; Elena Malanushenko; Viktor Malanushenko; Daniel Oravetz; Kaike Pan; Alaina Shelden; Audrey Simmons; Stephanie Snedden
texts
eye 52
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We use the Eighth Data Release of Sloan Digital Sky Survey (SDSS DR8) catalog with its additional sky coverage of the southern Galactic hemisphere, to measure the extent and study the nature of the Virgo Overdensity (VOD; Juric et al. 2008). The data show that the VOD extends over no less than 2000 deg^2, with its true extent likely closer to 3000 deg^2. We test whether the VOD can be attributed to a tilt in the stellar halo ellipsoid with respect to the plane of the Galactic disk and find that...
Source: http://arxiv.org/abs/1202.6367v1
49
49
Sep 23, 2013
09/13
by
Steven R. Majewski; David L. Nidever; Verne V. Smith; Guillermo J. Damke; William E. Kunkel; Richard J. Patterson; Dmitry Bizyaev; Ana E. Garcia Perez
texts
eye 49
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We present the latitude-normalized radial velocity (vb) distribution of 3318 subsolar metallicity, V
Source: http://arxiv.org/abs/1202.1832v1
155
155
Sep 23, 2013
09/13
by
Judy Y. Cheng; Constance M. Rockosi; Heather L. Morrison; Ralph A. Schönrich; Young Sun Lee; Timothy C. Beers; Dmitry Bizyaev; Kaike Pan; Donald P. Schneider
texts
eye 155
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The observed radial and vertical metallicity distribution of old stars in the Milky Way disk provides a powerful constraint on the chemical enrichment and dynamical history of the disk. We present the radial metallicity gradient, \Delta[Fe/H]/\Delta R, as a function of height above the plane, |Z|, using 7010 main sequence turnoff stars observed by the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey. The sample consists of mostly old thin and thick disk stars, with a...
Source: http://arxiv.org/abs/1110.5933v1
5
5.0
Jun 30, 2018
06/18
by
Samuel Halverson; Suvrath Mahadevan; Lawrence Ramsey; Fred Hearty; John Wilson; Jon Holtzman; Stephen Redman; Gillian Nave; David Nidever; Matt Nelson; Nick Venditti; Dmitry Bizyaev; Scott Fleming
texts
eye 5
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We discuss the ongoing development of single-mode fiber Fabry-Perot (FFP) Interferometers as precise astro-photonic calibration sources for high precision radial velocity (RV) spectrographs. FFPs are simple, inexpensive, monolithic units that can yield a stable and repeatable output spectrum. An FFP is a unique alternative to a traditional etalon, as the interferometric cavity is made of single-mode fiber rather than an air-gap spacer. This design allows for excellent collimation, high spectral...
Topics: Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1403.6841
45
45
Sep 23, 2013
09/13
by
Verne V. Smith; Katia Cunha; Matthew D. Shetrone; Szabolcs Meszaros; Carlos Allende Prieto; Dmitry Bizyaev; Ana Garcia Perez; Steven R. Majewski; Ricardo Schiavon; Jon Holtzman; Jennifer A. Johnson
texts
eye 45
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High-resolution H-band spectra of five bright field K, M, and MS giants, obtained from the archives of the Kitt Peak National Observatory (KPNO) Fourier Transform Spectrometer (FTS), are analyzed to determine chemical abundances of 16 elements. The abundances were derived via spectrum synthesis using the detailed linelist prepared for the SDSS III Apache Point Galactic Evolution Experiment (APOGEE), which is a high-resolution near-infrared spectroscopic survey to derive detailed chemical...
Source: http://arxiv.org/abs/1212.4091v1
20
20
Jun 28, 2018
06/18
by
Qingqing Mao; Andreas A. Berlind; Kelly Holley-Bockelmann; Katharine J. Schlesinger; Jennifer A. Johnson; Constance M. Rockosi; Timothy C. Beers; Donald P. Schneider; Kaike Pan; Dmitry Bizyaev; Elena Malanushenko
texts
eye 20
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We measure the two-point correlation function of G-dwarf stars within 1-3 kpc of the Sun in multiple lines-of-sight using the Schlesinger et al. G-dwarf sample from the SDSS SEGUE survey. The shapes of the correlation functions along individual SEGUE lines-of-sight depend sensitively on both the stellar-density gradients and the survey geometry. We fit smooth disk galaxy models to our SEGUE clustering measurements, and obtain strong constraints on the thin- and thick-disk components of the...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1507.01593
68
68
Sep 23, 2013
09/13
by
Yue Shen; Gordon T. Richards; Michael A. Strauss; Patrick B. Hall; Donald P. Schneider; Stephanie Snedden; Dmitry Bizyaev; Howard Brewington; Viktor Malanushenko; Elena Malanushenko; Dan Oravetz; Kaike Pan; Audrey Simmons
texts
eye 68
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We present a compilation of properties of the 105,783 quasars in the SDSS Data Release 7 (DR7) quasar catalog. In this value-added product, we compile continuum and emission line measurements around the Halpha, Hbeta, MgII and CIV regions, as well as other quantities such as radio properties, broad absorption line quasar (BALQSO) flags, and disk emitters. We also compile virial black hole mass estimates based on various calibrations. For the fiducial virial mass estimates we use the Vestergaard...
Source: http://arxiv.org/abs/1006.5178v2
49
49
Sep 22, 2013
09/13
by
Kevin C. Schlaufman; Constance M. Rockosi; Timothy C. Beers; Dmitry Bizyaev; Howard Brewington; Young Sun Lee; Viktor Malanushenko; Elena Malanushenko; Dan Oravetz; Kaike Pan; Audrey Simmons; Stephanie Snedden; Brian Yanny
texts
eye 49
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We identify ten -- seven for the first time -- elements of cold halo substructure (ECHOS) in the volume within 17.5 kpc of the Sun in the inner halo of the Milky Way. Our result is based on the observed spatial and radial velocity distribution of metal-poor main sequence turnoff (MPMSTO) stars in 137 Sloan Extension for Galactic Understanding and Exploration (SEGUE) lines of sight. We point out that the observed radial velocity distribution is consistent with a smooth stellar component of the...
Source: http://arxiv.org/abs/0908.2627v1
3
3.0
Jun 29, 2018
06/18
by
Qingqing Mao; Andreas A. Berlind; Robert J. Scherrer; Mark C. Neyrinck; Roman Scoccimarro; Jeremy L. Tinker; Cameron K. McBride; Donald P. Schneider; Kaike Pan; Dmitry Bizyaev; Elena Malanushenko; Viktor Malanushenko
texts
eye 3
favorite 0
comment 0
We present a cosmic void catalog using the large-scale structure galaxy catalog from the Baryon Oscillation Spectroscopic Survey (BOSS). This galaxy catalog is part of the Sloan Digital Sky Survey (SDSS) Data Release 12 and is the final catalog of SDSS-III. We take into account the survey boundaries, masks, and angular and radial selection functions, and apply the ZOBOV void finding algorithm to the galaxy catalog. We identify a total of 10,643 voids. After making quality cuts to ensure that...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1602.02771
65
65
Sep 21, 2013
09/13
by
Nathan A. Kaib; Andrew C. Becker; R. Lynne Jones; Andrew W. Puckett; Dmitry Bizyaev; Benjamin Dilday; Joshua A. Frieman; Daniel J. Oravetz; Kaike Pan; Thomas Quinn; Donald P. Schneider; Shannon Watters
texts
eye 65
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We report the discovery of a minor planet (2006 SQ372) on an orbit with a perihelion of 24 AU and a semimajor axis of 796 AU. Dynamical simulations show that this is a transient orbit and is unstable on a timescale of 200 Myrs. Falling near the upper semimajor axis range of the scattered disk and the lower semimajor axis range of the Oort Cloud, previous membership in either class is possible. By modeling the production of similar orbits from the Oort Cloud as well as from the scattered disk,...
Source: http://arxiv.org/abs/0901.1690v1
3
3.0
Jun 29, 2018
06/18
by
Héctor J. Ibarra-Medel; Sebastián F. Sánchez; Vladimir Avila-Reese; Héctor M. Hernández-Toledo; Jesús González; Daniel Thomas; Niv Drory; Kevin Bundy; Mariana Cano-Díaz; Alexandre Roman-Lopes; Dmitry Bizyaev; Elena Malanushenko; Kaike Pan
texts
eye 3
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By means of the fossil record method implemented through Pipe3D, we reconstruct the global and radial stellar mass growth histories (MGHs) of an unprecedentedly large sample of galaxies, ranging from dwarf to giant objects, from the "Mapping Nearby Galaxies at the Apache Point Observatory" survey. We confirm that the main driver of the global MGHs is mass, with more massive galaxies assembling their masses earlier (downsizing), though for a given mass, the global MGHs segregate by...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.01304
6
6.0
Jun 29, 2018
06/18
by
Charli M. Sakari; Matthew D. Shetrone; Ricardo P. Schiavon; Dmitry Bizyaev; Carlos Allende Prieto; Timothy C. Beers; Nelson Caldwell; Domingo Anibal Garcia-Hernandez; Sara Lucatello; Steven Majewski; Robert W. O'Connell; Kaike Pan; Jay Strader
texts
eye 6
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Chemical abundances are presented for 25 M31 globular clusters (GCs), based on moderately high resolution (R = 22, 500) H-band integrated light spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE). Infrared spectra offer lines from new elements, of different strengths, and at higher excitation potentials compared to the optical. Integrated abundances of C, N, and O are derived from CO, CN, and OH molecular features, while Fe, Na, Mg, Al, Si, K, Ca, and Ti abundances...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1607.06811
4
4.0
Jun 28, 2018
06/18
by
M. Ness; G. Zasowski; J. A. Johnson; E. Athanassoula; S. R. Majewski; A. E. Garcia Perez; J. Bird; D. Nidever; Donald P. Schneider; J. Sobeck; P. Frinchaboy; Kaike Pan; Dmitry Bizyaev; Daniel Oravetz; Audrey Simmons
texts
eye 4
favorite 0
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We present the stellar kinematics across the Galactic bulge and into the disk at positive longitudes from the SDSS-III APOGEE spectroscopic survey of the Milky Way. APOGEE includes extensive coverage of the stellar populations of the bulge along the mid-plane and near-plane regions. From these data, we have produced kinematic maps of 10,000 stars across longitudes 0 deg < l < 65 deg, and primarily across latitudes of |b| < 5 deg in the bulge region. The APOGEE data reveal that the...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1512.04948
39
39
Sep 21, 2013
09/13
by
Brian Yanny; Heidi Jo Newberg; Jennifer A. Johnson; Young Sun Lee; Timothy C. Beers; Dmitry Bizyaev; Howard Brewington; Paola Re Fiorentin; Paul Harding; Elena Malanushenko; Viktor Malanushenko; Dan Oravetz; Kaike Pan; Audrey Simmons; Stephanie Snedden
texts
eye 39
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We show that the Sagittarius dwarf tidal stream can be traced with very red K/M-giant stars selected from SDSS photometry. A subset of these stars are spectroscopically confirmed with SEGUE and SDSS spectra, and the distance scale of 2MASS and SDSS M giants is calibrated to the RR Lyrae distance scale. The absolute g band magnitude of the K/M-giant stars at the tip of the giant branch is M_g=-1.0. The line-of-sight velocities of the M giant and BHB stars that are spatially coincident with the...
Source: http://arxiv.org/abs/0905.4502v2
53
53
Sep 21, 2013
09/13
by
Judy Y. Cheng; Constance M. Rockosi; Heather L. Morrison; Young Sun Lee; Timothy C. Beers; Dmitry Bizyaev; Paul Harding; Elena Malanushenko; Viktor Malanushenko; Daniel Oravetz; Kaike Pan; Katharine J. Schlesinger; Donald P. Schneider; Audrey Simmons; Benjamin A. Weaver
texts
eye 53
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We examine the \alpha-element abundance ratio, [\alpha/Fe], of 5620 stars, observed by the Sloan Extension for Galactic Understanding and Exploration survey in the region 6 kpc < R < 16 kpc, 0.15 kpc < |Z| < 1.5 kpc, as a function of Galactocentric radius R and distance from the Galactic plane |Z|. Our results show that the high-\alpha\ thick disk population has a short scale length (L_thick ~ 1.8 kpc) compared to the low-\alpha population, which is typically associated with the...
Source: http://arxiv.org/abs/1204.5179v1
6
6.0
Jun 29, 2018
06/18
by
Jorge K. Barrera-Ballesteros; Timothy M. Heckman; Guangtun B. Zhu; Nadia L. Zakamska; Sebastian F. Sánchez; David Law; David Wake; Jenny E. Green; Dmitry Bizyaev; Daniel Oravetz; Audrey Simmons; Elena Malanushenko; Kaike Pan; Alexandre Roman Lopes; Richard R. Lane
texts
eye 6
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We present the stellar surface mass density {\it vs.} gas metallicity ($\Sigma_*-Z$) relation for more than 500,000 spatially-resolved star-forming resolution elements (spaxels) from a sample of 653 disk galaxies included in the SDSS IV MaNGA survey. We find a tight relation between these local properties, with higher metallicities as the surface density increases. This relation extends over three orders of magnitude in the surface mass density and a factor of four in metallicity. We show that...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.01740
44
44
Sep 22, 2013
09/13
by
Richard Kessler; David Cinabro; Bruce Bassett; Benjamin Dilday; Joshua A. Frieman; Peter M. Garnavich; Saurabh Jha; John Marriner; Robert C. Nichol; Masao Sako; Mathew Smith; Joseph P. Bernstein; Dmitry Bizyaev; Ariel Goobar; Stephen Kuhlmann; Donald P. Schneider; Maximilian Stritzinger
texts
eye 44
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Large planned photometric surveys will discover hundreds of thousands of supernovae (SNe), outstripping the resources available for spectroscopic follow-up and necessitating the development of purely photometric methods to exploit these events for cosmological study. We present a light-curve fitting technique for SN Ia photometric redshift (photo-z) estimation in which the redshift is determined simultaneously with the other fit parameters. We implement this "LCFIT+Z" technique within...
Source: http://arxiv.org/abs/1001.0738v2
13
13
Jun 28, 2018
06/18
by
Mouyuan Sun; Jonathan R. Trump; Yue Shen; W. N. Brandt; Kyle Dawson; Kelly D. Denney; Patrick B. Hall; Luis C. Ho; Keith Horne; Linhua Jiang; Gordon T. Richards; Donald P. Schneider; Dmitry Bizyaev; Karen Kinemuchi; Daniel Oravetz; Kaike Pan; Audrey Simmons
texts
eye 13
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We explore the variability of quasars in the MgII and Hbeta broad emission lines and UV/optical continuum emission using the Sloan Digital Sky Survey Reverberation Mapping project (SDSS-RM). This is the largest spectroscopic study of quasar variability to date: our study includes 29 spectroscopic epochs from SDSS-RM over $6$ months, containing 357 quasars with MgII and 41 quasars with Hbeta . On longer timescales, the study is also supplemented with two-epoch data from SDSS-I/II. The SDSS-I/II...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1506.07886
21
21
Jun 26, 2018
06/18
by
Matthew Shetrone; Dmitry Bizyaev; James Lawler; Carlos Allende Prieto; Jennifer A. Johnson; Verne Smith; Katia Cunha; Jon Holtzman; Ana Garcia Perez; Szabolcs Meszaros; Jennifer Sobeck; Olga Zamora; Anibal Garcia-Hernandez; Diogo Souto; Drew Chojnowski; Lars Koesterke; Steven Majewski; Gail Zasowski
texts
eye 21
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We present the $H$-band spectral line lists adopted by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). The APOGEE line lists comprise astrophysical, theoretical, and laboratory sources from the literature, as well as newly evaluated astrophysical oscillator strengths and damping parameters. We discuss the construction of the APOGEE line list, which is one of the critical inputs for the APOGEE Stellar Parameters and Chemical Abundances Pipeline, and present three different...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics, Solar and Stellar Astrophysics,...
Source: http://arxiv.org/abs/1502.04080
13
13
Jun 26, 2018
06/18
by
Joleen K. Carlberg; Verne V. Smith; Katia Cunha; Steven R. Majewski; Szabolcs Meszaros; Matthew Shetrone; Carlos Allende Prieto; Dmitry Bizyaev; Keivan G. Stassun; Scott W. Fleming; Gail Zasowski; Fred Hearty; David L. Nidever; Donald P. Schneider; Jon A. Holtzman; Peter M. Frinchaboy
texts
eye 13
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A Li-rich red giant star (2M19411367+4003382) recently discovered in the direction of NGC 6819 belongs to the rare subset of Li-rich stars that have not yet evolved to the luminosity bump, an evolutionary stage where models predict Li can be replenished. The currently favored model to explain Li enhancement in first-ascent red giants like 2M19411367+4003382 requires deep mixing into the stellar interior. Testing this model requires a measurement of 12C/13C, which is possible to obtain from...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1501.05625
51
51
Sep 18, 2013
09/13
by
Roland de Putter; Olga Mena; Elena Giusarma; Shirley Ho; Antonio Cuesta; Hee-Jong Seo; Ashley Ross; Martin White; Dmitry Bizyaev; Howard Brewington; David Kirkby; Elena Malanushenko; Viktor Malanushenko; Daniel Oravetz; Kaike Pan; Will J. Percival; Nicholas P. Ross; Donald P. Schneider; Alaina Shelden; Audrey Simmons; Stephanie Snedden
texts
eye 51
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We present neutrino mass bounds using 900,000 luminous galaxies with photometric redshifts measured from Sloan Digital Sky Survey III Data Release Eight (SDSS DR8). The galaxies have photometric redshifts between $z = 0.45$ and $z = 0.65$, and cover 10,000 square degrees and thus probe a volume of 3$h^{-3}$Gpc$^3$, enabling tight constraints to be derived on the amount of dark matter in the form of massive neutrinos. A new bound on the sum of neutrino masses $\sum m_\nu < 0.26$ eV, at 95%...
Source: http://arxiv.org/abs/1201.1909v1
4
4.0
Jun 29, 2018
06/18
by
Trey W. Jensen; M. Vivek; Kyle S. Dawson; Scott F. Anderson; Julian Bautista; Dmitry Bizyaev; William N. Brandt; Joel R. Brownstein; Paul Green; David W. Harris; Vikrant Kamble; Ian D. McGreer; Andrea Merloni; Adam Myers; Daniel Oravetz; Kaike Pan; Isabelle Pâris; Donald P. Schneider; Audrey Simmons; Nao Suzuki
texts
eye 4
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We report on the diversity in quasar spectra from the Baryon Oscillation Spectroscopic Survey. After filtering the spectra to mitigate selection effects and Malmquist bias associated with a nearly flux-limited sample, we create high signal-to-noise ratio composite spectra from 58,656 quasars (2.1 \le z \le 3.5), binned by luminosity, spectral index, and redshift. With these composite spectra, we confirm the traditional Baldwin effect (BE, i.e., the anticorrelation of C IV equivalent width (EW)...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1611.08884
13
13
Jun 26, 2018
06/18
by
Yue Shen; Jenny E. Greene; Luis C. Ho; W. N. Brandt; Kelly D. Denney; Keith Horne; Linhua Jiang; Christopher S. Kochanek; Ian D. McGreer; Andrea Merloni; Bradley M. Peterson; Patrick Petitjean; Donald P. Schneider; Andreas Schulze; Michael A. Strauss; Charling Tao; Jonathan R. Trump; Kaike Pan; Dmitry Bizyaev
texts
eye 13
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We present host stellar velocity dispersion measurements for a sample of 88 broad-line quasars at 0.10.6) from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. High signal-to-noise ratio coadded spectra (average S/N~30 per 69 km/s pixel) from SDSS-RM allowed decomposition of the host and quasar spectra, and measurement of the host stellar velocity dispersions and black hole (BH) masses using the single-epoch (SE) virial method. The large sample size and dynamic range in...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1502.01034
6
6.0
Jun 29, 2018
06/18
by
Diogo Souto; Katia Cunha; Verne Smith; Carlos Allende Prieto; Marc Pinsonneault; Olga Zamora; D. Anibal García-Hernández; Szabolcs Meszaros; Jo Bovy; Ana Elia García Pérez; Friedrich Anders; Dmitry Bizyaev; Ricardo Carrera; Peter Frinchaboy; Jon Holtzman; Inese Ivans; Steve Majewski; Matthew Shetrone; Jennifer Sobeck; Kaike Pan; Baitian Tang; Sandro Villanova; Douglas Geisler
texts
eye 6
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NGC 2420 is a $\sim$2 Gyr-old well-populated open cluster that lies about 2 kpc beyond the solar circle, in the general direction of the Galactic anti-center. Most previous abundance studies have found this cluster to be mildly metal-poor, but with a large scatter in the obtained metallicities for this open cluster. Detailed chemical abundance distributions are derived for 12 red-giant members of NGC 2420 via a manual abundance analysis of high-resolution (R = 22,500) near-infrared...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1607.06102
4
4.0
Jun 29, 2018
06/18
by
Francesco Belfiore; Roberto Maiolino; Claudia Maraston; Eric Emsellem; Matthew A. Bershady; Karen L. Masters; Renbin Yan; Dmitry Bizyaev; Médéric Boquien; Joel R. Brownstein; Kevin Bundy; Niv Drory; Timothy M. Heckman; David R. Law; Alexandre Roman-Lopes; Kaike Pan; Letizia Stanghellini; Daniel Thomas; Anne-Marie Weijmans; Kyle B. Westfall
texts
eye 4
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We study the spatially resolved excitation properties of the ionised gas in a sample of 646 galaxies using integral field spectroscopy data from SDSS-IV MaNGA. Making use of Baldwin-Philips-Terlevich diagnostic diagrams we demonstrate the ubiquitous presence of extended (kpc scale) low ionisation emission-line regions (LIERs) in both star forming and quiescent galaxies. In star forming galaxies LIER emission can be associated with diffuse ionised gas, most evident as extra-planar emission in...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1605.07189
3
3.0
Jun 29, 2018
06/18
by
Zheng Zheng; Huiyuan Wang; Junqiang Ge; Shude Mao; Cheng Li; Ran Li; Houjun Mo; Daniel Goddard; Kevin Bundy; Hongyu Li; Preethi Nair; Lihwai Lin; R. J. Long; Rogerio Riffel; Daniel Thomas; Karen Masters; Dmitry Bizyaev; Joel R. Brownstein; Kai Zhang; David R. Law; Niv Drory; Alexandre Roman Lopes; Olena Malanushenko
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We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA integral field spectra. We derive age and metallicity gradients by fitting straight lines to the radial profiles, and explore their correlations with total stellar mass M*, NUV-r colour and environments, as identified by both the large scale structure (LSS) type and the local density. We find that the mean age and metallicity gradients are close to zero but slightly...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1612.01523
5
5.0
Jun 29, 2018
06/18
by
Baitian Tang; Roger E. Cohen; Doug Geisler; Ricardo Schiavon; Steven R. Majewski; Sandro Villanova; Ricardo Carrera; Olga Zamora; D. A. Garcia-Hernandez; Matthew Shetrone; Peter Frinchaboy; Andres Meza; J. G. Fernández-Trincado; Ricardo R. Muñoz; Chien-Cheng Lin; Richard R. Lane; Christian Nitschelm; Kaike Pan; Dmitry Bizyaev; Daniel Oravetz; Audrey Simmons
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eye 5
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Multiple populations revealed in globular clusters (GCs) are important windows to the formation and evolution of these stellar systems. The metal-rich GCs in the Galactic bulge are an indispensable part of this picture, but the high optical extinction in this region has prevented extensive research. In this work, we use the high resolution near-infrared (NIR) spectroscopic data from APOGEE to study the chemical abundances of NGC 6553, which is one of the most metal-rich bulge GCs. We identify...
Topics: Astrophysics, Solar and Stellar Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1610.06763
37
37
Sep 23, 2013
09/13
by
Rita Tojeiro; Will Percival; David A. Wake; Claudia Maraston; Ramin A. Skibba; Idit Zehavi; Ashley J. Ross; Charlie Conroy; Hong Guo; Marc Manera; Karen L. Masters; Janine Pforr; Lado Samushia; Donald P. Schneider; Daniel Thomas; Dmitry Bizyaev; Howard Brewington; Elena Malanushenko; Viktor Malanushenko; Daniel Oravetz; Kaike Pan; Alaina Shelden; Audrey Simmons; Stephanie Snedden
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eye 37
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We present a comprehensive study of 250,000 galaxies targeted by the Baryon Oscillation Spectroscopic Survey (BOSS) up to z ~ 0.7 with the specific goal of identifying and characterising a population of galaxies that has evolved without significant merging. We compute a likelihood that each BOSS galaxy is a progenitor of the Luminous Red Galaxies (LRGs) sample, targeted by SDSS-I/II up z ~ 0.5, by using the fossil record of LRGs and their inferred star-formation histories, metallicity histories...
Source: http://arxiv.org/abs/1202.6241v2
28
28
Jun 26, 2018
06/18
by
David L. Nidever; Jon A. Holtzman; Carlos Allende Prieto; Stephane Beland; Chad Bender; Dmitry Bizyaev; Adam Burton; Rohit Desphande; Scott W. Fleming; Ana Elia Garcia Perez; Fred R. Hearty; Steven R. Majewski; Szabolcs Meszaros; Demitri Muna; Duy Nguyen; Ricardo P. Schiavon; Matthew Shetrone; Michael F. Skrutskie; Jennifer S. Sobeck; John C. Wilson
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eye 28
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The Apache Point Observatory Galactic Evolution Experiment (APOGEE), part of the Sloan Digital Sky Survey III, explores the stellar populations of the Milky Way using the Sloan 2.5-m telescope linked to a high resolution (R~22,500), near-infrared (1.51-1.70 microns) spectrograph with 300 optical fibers. For over 150,000 predominantly red giant branch stars that APOGEE targeted across the Galactic bulge, disks and halo, the collected high S/N (>100 per half-resolution element) spectra provide...
Topics: Astrophysics, Instrumentation and Methods for Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1501.03742
7
7.0
Jun 29, 2018
06/18
by
Francesco Belfiore; Roberto Maiolino; Claudia Maraston; Eric Emsellem; Matthew A. Bershady; Karen L. Masters; Dmitry Bizyaev; Médéric Boquien; Joel R. Brownstein; Kevin Bundy; Aleksandar M. Diamond-Stanic; Niv Drory; Timothy M. Heckman; David R. Law; Olena Malanushenko; Audrey Oravetz; Kaike Pan; Alexandre Roman-Lopes; Daniel Thomas; Anne-Marie Weijmans; Kyle B. Westfall; Renbin Yan
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eye 7
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Using spatially resolved spectroscopy from SDSS-IV MaNGA we have demonstrated that low ionisation emission line regions (LIERs) in local galaxies result from photoionisation by hot evolved stars, not active galactic nuclei. LIERs are ubiquitous in both quiescent galaxies and in the central regions of galaxies where star formation takes place at larger radii. We refer to these two classes of galaxies as extended LIER (eLIER) and central LIER (cLIER) galaxies respectively. cLIERs are late type...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.01737
6
6.0
Jun 29, 2018
06/18
by
Samantha J. Penny; Karen L. Masters; Anne-Marie Weijmans; Kyle B. Westfall; Matthew A. Bershady; Kevin Bundy; Niv Drory; Jesús Falcón-Barroso; David Law; Robert C. Nichol; Daniel Thomas; Dmitry Bizyaev; Joel R. Brownstein; Gordon Freischlad; Patrick Gaulme; Katie Grabowski; Karen Kinemuchi; Elena Malanushenko; Viktor Malanushenko; Daniel Oravetz; Alexandre Roman-Lopes; Kaike Pan; Audrey Simmons; David A. Wake
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eye 6
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Using kinematic maps from the Sloan Digital Sky Survey (SDSS) Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, we reveal that the majority of low-mass quenched galaxies exhibit coherent rotation in their stellar kinematics. Our sample includes all 39 quenched low-mass galaxies observed in the first year of MaNGA. The galaxies are selected with $M_{r} > -19.1$, stellar masses $10^{9}$ M$_{\odot} < M_{\star} < 5\times10^{9}$ M$_{\odot}$, EW$_{H\alpha} 1.9$. They lie on...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.01299
4
4.0
Jun 30, 2018
06/18
by
Stephen S. Eikenberry; S. Drew Chojnowski; John Wisniewski; Steven R. Majewski; Matthew Shetrone; David G. Whelan; Dmitry Bizyaev; H. Jacob Borish; James R. A. Davenport; Garrett Ebelke; Diane Feuillet; Peter M. Frinchaboy; Alan Garner; Fred Hearty; Jon Holtzman; Zhi-Yun Li; Sz. Meszaros; David L. Nidever; Donald P. Schneider; Michael Skrutskie; John C. Wilson; Gail Zasowski
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The Apache Point Observatory Galactic Evolution Experiment (APOGEE) - one of the Sloan Digital Sky Survey III programs -- is using near-infrared spectra of $\sim 100,000$ red giant branch star candidates to study the structure of the Milky Way. In the course of the survey, APOGEE also acquires spectra of hot field stars to serve as telluric calibrators for the primary science targets. We report the serendipitous discovery of two rare, fast-rotating B stars of the $\sigma$ Ori E type among those...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1403.3239
6
6.0
Jun 28, 2018
06/18
by
Renbin Yan; Christy Tremonti; Matthew A. Bershady; David R. Law; David J. Schlegel; Kevin Bundy; Niv Drory; Nicholas MacDonald; Dmitry Bizyaev; Guillermo A. Blanc; Michael R. Blanton; Brian Cherinka; Arthur Eigenbrot; James E. Gunn; Paul Harding; David W. Hogg; José R. Sánchez-Gallego; Sebastian F. Sánchez; David A. Wake; Anne-Marie Weijmans; Ting Xiao; Kai Zhang
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eye 6
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Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV (SDSS-IV), is an integral-field spectroscopic (IFS) survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2 arcsec fibers to obtain resolved spectroscopy over a wide wavelength range of 3,600-10,300A. To map the internal variations within each galaxy, we need to perform accurate {\it spectral surface photometry}, which is...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1511.01496
63
63
Sep 23, 2013
09/13
by
Yue Shen; Cameron K. McBride; Martin White; Zheng Zheng; Adam D. Myers; Hong Guo; Jessica A. Kirkpatrick; Nikhil Padmanabhan; John K. Parejko; Nicholas P. Ross; David J. Schlegel; Donald P. Schneider; Alina Streblyanska; Molly E. C. Swanson; Idit Zehavi; Kaike Pan; Dmitry Bizyaev; Howard Brewington; Garrett Ebelke; Viktor Malanushenko; Elena Malanushenko; Daniel Oravetz; Audrey Simmons; Stephanie Snedden
texts
eye 63
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We present the measurement of the two-point cross-correlation function (CCF) of 8,198 Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) quasars and 349,608 DR10 CMASS galaxies from the Baryonic Oscillation Spectroscopic Survey (BOSS) at redshift ~0.5 (0.3=0.53 from the CCF measurements. This linear bias corresponds to a characteristic host halo mass of ~4x10^12 M_sun/h, compared to ~10^13 M_sun/h characteristic host halo mass for CMASS galaxies. We divide the quasar sample in luminosity and...
Source: http://arxiv.org/abs/1212.4526v1
4
4.0
Jun 29, 2018
06/18
by
Kai Zhang; Renbin Yan; Kevin Bundy; Matthew Bershady; L. Matthew Haffner; René Walterbos; Roberto Maiolino; Christy Tremonti; Daniel Thomas; Niv Drory; Amy Jones; Francesco Belfiore; Sebastian F. Sánchez; Aleksandar M. Diamond-Stanic; Dmitry Bizyaev; Christian Nitschelm; Brett Andrews; Jon Brinkmann; Joel R. Brownstein; Edmond Cheung; Cheng Li; David R. Law; Alexandre Roman Lopes; Daniel Oravetz; Kaike Pan; Thaisa Storchi-Bergmann; Audrey Simmons
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Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low H\alpha\ surface brightness regions display enhanced [SII]/H\alpha, [NII]/H\alpha, [OII]/H\beta, and [OI]/H\alpha. The gradients...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1612.02000
64
64
Sep 21, 2013
09/13
by
Deokkeun An; Jennifer A. Johnson; James L. Clem; Brian Yanny; Constance M. Rockosi; Heather L. Morrison; Paul Harding; James E. Gunn; Carlos Allende Prieto; Timothy C. Beers; Kyle M. Cudworth; Inese I. Ivans; Zeljko Ivezic; Young Sun Lee; Robert H. Lupton; Dmitry Bizyaev; Howard Brewington; Elena Malanushenko; Viktor Malanushenko; Dan Oravetz; Kaike Pan; Audrey Simmons; Stephanie Snedden; Shannon Watters; Donald G. York
texts
eye 64
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We present photometry for globular and open cluster stars observed with the Sloan Digital Sky Survey (SDSS). In order to exploit over 100 million stellar objects with r < 22.5 mag observed by SDSS, we need to understand the characteristics of stars in the SDSS ugriz filters. While star clusters provide important calibration samples for stellar colors, the regions close to globular clusters, where the fraction of field stars is smallest, are too crowded for the standard SDSS photometric...
Source: http://arxiv.org/abs/0808.0001v1
4
4.0
Jun 29, 2018
06/18
by
Daniel Goddard; Daniel Thomas; Claudia Maraston; Kyle Westfall; James Etherington; Rogerio Riffel; Nicolas D. Mallmann; Zheng Zheng; Maria Argudo-Fernandez; Matthew A. Bershady; Kevin Bundy; Niv Drory; David R. Law; Renbin Yan; David Wake; Anne-Marie Weijmans; Dmitry Bizyaev; Joel R. Brownstein; Richard R. Lane; Roberto Maiolino; Karen L. Masters; Michael R. Merrifield; Christian Nitschelm; Kaike Pan; Alexandre Roman-Lopes; Thaisa Storchi-Bergmann
texts
eye 4
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We study the internal radial gradients of stellar population properties within $1.5\;R_{\rm e}$ and analyse the impact of galaxy environment. We use a representative sample of 721 galaxies with masses ranging between $10^{9}\;M_{\odot}$ to $10^{11.5}\;M_{\odot}$ from the SDSS-IV survey MaNGA. We split this sample by morphology into early-type and late-type galaxies. Using the full spectral fitting code FIREFLY, we derive the light and mass-weighted stellar population properties age and...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1612.01545
5
5.0
Jun 29, 2018
06/18
by
Edmond Cheung; Kevin Bundy; Michele Cappellari; Sébastien Peirani; Wiphu Rujopakarn; Kyle Westfall; Renbin Yan; Matthew Bershady; Jenny E. Greene; Timothy M. Heckman; Niv Drory; David R. Law; Karen L. Masters; Daniel Thomas; David A. Wake; Anne-Marie Weijmans; Kate Rubin; Francesco Belfiore; Benedetta Vulcani; Yan-mei Chen; Kai Zhang; Joseph D. Gelfand; Dmitry Bizyaev; A. Roman-Lopes; Donald P. Schneider
texts
eye 5
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Quiescent galaxies with little or no ongoing star formation dominate the galaxy population above $M_{*}\sim 2 \times 10^{10}~M_{\odot}$, where their numbers have increased by a factor of $\sim25$ since $z\sim2$. Once star formation is initially shut down, perhaps during the quasar phase of rapid accretion onto a supermassive black hole, an unknown mechanism must remove or heat subsequently accreted gas from stellar mass loss or mergers that would otherwise cool to form stars. Energy output from...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1605.07626
14
14
Jun 27, 2018
06/18
by
C. J. Grier; P. B. Hall; W. N. Brandt; J. R. Trump; Yue Shen; M. Vivek; N. Filiz Ak; Yuguang Chen; K. S. Dawson; K. D. Denney; Paul. J. Green; Linhua Jiang; C. S. Kochanek; Ian D. McGreer; I. Pâris; B. M. Peterson; D. P. Schneider; Charling Tao; W. M. Wood-Vasey; Dmitry Bizyaev; Jian Ge; Karen Kinemuchi; Daniel Oravetz; Kaike Pan; Audrey Simmons
texts
eye 14
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We report the discovery of rapid variations of a high-velocity CIV broad absorption line trough in the quasar SDSS J141007.74+541203.3. This object was intensively observed in 2014 as a part of the Sloan Digital Sky Survey Reverberation Mapping Project, during which 32 epochs of spectroscopy were obtained with the Baryon Oscillation Spectroscopic Survey spectrograph. We observe significant (>4sigma) variability in the equivalent width of the broad (~4000 km/s wide) CIV trough on rest-frame...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1503.03076
6
6.0
Jun 30, 2018
06/18
by
Alessandra Beifiori; Daniel Thomas; Claudia Maraston; Oliver Steele; Karen L. Masters; Janine Pforr; Roberto P. Saglia; Ralf Bender; Rita Tojeiro; Yan-Mei Chen; Adam Bolton; Joel R. Brownstein; Jonas Johansson; Alexie Leauthaud; Robert C. Nichol; Donald P. Schneider; Robert Senger; Ramin Skibba; David Wake; Kaike Pan; Stephanie Snedden; Dmitry Bizyaev; Howard Brewington; Viktor Malanushenko; Elena Malanushenko; Daniel Oravetz; Audrey Simmons; Alaina Shelden; Garrett Ebelke
texts
eye 6
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We study the redshift evolution of the dynamical properties of ~180,000 massive galaxies from SDSS-III/BOSS combined with a local early-type galaxy sample from SDSS-II in the redshift range 0.12sigma significance. By combining our sample with high-redshift literature data we find that this evolution of the dynamical to stellar mass ratio continues beyond z~0.7 up to z>2 as Mdyn/Mstar~ (1+z)^{-0.30+/- 0.12} further strengthening the evidence for an increase of Mdyn/Mstar with cosmic time....
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1405.1431
4
4.0
Jun 29, 2018
06/18
by
Edmond Cheung; David V. Stark; Song Huang; Kate H. R. Rubin; Lihwai Lin; Christy Tremonti; Kai Zhang; Renbin Yan; Dmitry Bizyaev; Médéric Boquien; Joel R. Brownstein; Niv Drory; Joseph D. Gelfand; Johan H. Knapen; Roberto Maiolino; Olena Malanushenko; Karen L. Masters; Michael R. Merrifield; Zach Pace; Kaike Pan; Rogemar A. Riffel; Alexandre Roman-Lopes; Wiphu Rujopakarn; Donald P. Schneider; John P. Stott; Daniel Thomas; Anne-Marie Weijmans
texts
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The nature of warm, ionized gas outside of galaxies may illuminate several key galaxy evolutionary processes. A serendipitous observation by the MaNGA survey has revealed a large, asymmetric H$\alpha$ complex with no optical counterpart that extends $\approx8"$ ($\approx6.3$ kpc) beyond the effective radius of a dusty, starbursting galaxy. This H$\alpha$ extension is approximately three times the effective radius of the host galaxy and displays a tail-like morphology. We analyze its...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.02155
