7
7.0
Jun 30, 2018
06/18
by
A. Del Moro; J. R. Mullaney; D. M. Alexander; A. Comastri; F. E. Bauer; E. Treister; D. Stern; F. Civano; P. Ranalli; C. Vignali; J. A. Aird; D. R. Ballantyne; M. Baloković; S. E. Boggs; W. N. Brandt; F. E. Christensen; W. W. Craig; P. Gandhi; R. Gilli; C. J. Hailey; F. A. Harrison; R. C. Hickox; S. M. LaMassa; G. B. Lansbury; B. Luo; S. Puccetti; M. Urry; W. W. Zhang
texts
eye 7
favorite 0
comment 0
We report NuSTAR observations of NuSTAR J033202-2746.8, a heavily obscured, radio-loud quasar detected in the Extended Chandra Deep Field-South, the deepest layer of the NuSTAR extragalactic survey (~400 ks, at its deepest). NuSTAR J033202-2746.8 is reliably detected by NuSTAR only at E>8 keV and has a very flat spectral slope in the NuSTAR energy band (Gamma=0.55^{+0.62}_{-0.64}; 3-30 keV). Combining the NuSTAR data with extremely deep observations by Chandra and XMM-Newton (4 Ms and 3 Ms,...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1403.2491
8
8.0
Jun 30, 2018
06/18
by
B. D Lehmer; M. Berkeley; A. Zezas; D. M. Alexander; A. Basu-Zych; F. E. Bauer; W. N. Brandt; T. Fragos; A. E. Hornschemeier; V. Kalogera; A. Ptak; G. R. Sivakoff; P. Tzanavaris; M. Yukita
texts
eye 8
favorite 0
comment 0
We present direct constraints on how the formation of low-mass X-ray binary (LMXB) populations in galactic fields depends on stellar age. In this pilot study, we utilize Chandra and Hubble Space Telescope (HST) data to detect and characterize the X-ray point source populations of three nearby early-type galaxies: NGC 3115, 3379, and 3384. The luminosity-weighted stellar ages of our sample span 3-10 Gyr. X-ray binary population synthesis models predict that the field LMXBs associated with...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1405.2069
8
8.0
Jun 30, 2018
06/18
by
B. Luo; W. N. Brandt; D. M. Alexander; D. Stern; S. H. Teng; P. Arévalo; F. E. Bauer; S. E. Boggs; F. E. Christensen; A. Comastri; W. W. Craig; D. Farrah; P. Gandhi; C. J. Hailey; F. A. Harrison; M. Koss; P. Ogle; S. Puccetti; C. Saez; A. E. Scott; D. J. Walton; W. W. Zhang
texts
eye 8
favorite 0
comment 0
We report NuSTAR observations of a sample of six X-ray weak broad absorption line (BAL) quasars. These targets, at z=0.148-1.223, are among the optically brightest and most luminous BAL quasars known at z 330 times weaker than expected for typical quasars. Our results from a pilot NuSTAR study of two low-redshift BAL quasars, a Chandra stacking analysis of a sample of high-redshift BAL quasars, and a NuSTAR spectral analysis of the local BAL quasar Mrk 231 have already suggested the existence...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1408.3633
3
3.0
Jun 30, 2018
06/18
by
C. M. Harrison; A. P. Thomson; D. M. Alexander; F. E. Bauer; A. C. Edge; M. T. Hogan; J. R. Mullaney; A. M. Swinbank
texts
eye 3
favorite 0
comment 0
We present multi-frequency (1-8 GHz) VLA data, combined with VIMOS IFU data and HST imaging, of a z=0.085 radio-quiet type 2 quasar (with L(1.4GHz)~5e23 W/Hz and L(AGN)~2e45 erg/s). Due to the morphology of its emission-line region, the target (J1430+1339) has been referred to as the Teacup AGN in the literature. We identify "bubbles" of radio emission that are extended ~10-12 kpc to both the east and west of the nucleus. The edge of the brighter eastern bubble is co-spatial with an...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics, Cosmology and...
Source: http://arxiv.org/abs/1410.4198
6
6.0
Jun 30, 2018
06/18
by
C. Romero-Cañizales; R. Herrero-Illana; M. A. Pérez-Torres; A. Alberdi; E. Kankare; F. E. Bauer; S. D. Ryder; S. Mattila; J. E. Conway; R. J. Beswick; T. W. B. Muxlow
texts
eye 6
favorite 0
comment 0
We report radio observations of two stripped-envelope supernovae (SNe), 2010O and 2010P, which exploded within a few days of each other in the luminous infrared galaxy Arp 299. Whilst SN 2010O remains undetected at radio frequencies, SN 2010P was detected (with an astrometric accuracy better than 1 milli arcsec in position) in its optically thin phase in epochs ranging from ~1 to ~3yr after its explosion date, indicating a very slow radio evolution and a strong interaction of the SN ejecta with...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1403.1036
8
8.0
Jun 30, 2018
06/18
by
D. J. Rosario; D. H. McIntosh; A. van der Wel; J. Kartaltepe; P. Lang; P. Santini; S. Wuyts; D. Lutz; M. Rafelski; C. Villforth; D. M. Alexander; F. E. Bauer; E. F. Bell; S. Berta; W. N. Brandt; C. J. Conselice; A. Dekel; S. M. Faber; H. C. Ferguson; R. Genzel; N. A. Grogin; D. D. Kocevski; A. M. Koekemoer; D. C. Koo; J. M. Lotz; B. Magnelli; R. Maiolino; M. Mozena; J. R. Mullaney; C. J. Papovich; P. Popesso; L. J. Tacconi; J. R. Trump; S. Avadhuta; R. Bassett; A. Bell; M. Bernyk; F. Bournaud;...
texts
eye 8
favorite 0
comment 0
We study the relationship between the structure and star-formation rate (SFR) of X-ray selected low and moderate luminosity active galactic nuclei (AGNs) in the two Chandra Deep Fields, using Hubble Space Telescope imaging from the Cosmic Assembly Near Infrared Extragalactic Legacy Survey (CANDELS) and deep far-infrared maps from the PEP+GOODS-Herschel survey. We derive detailed distributions of structural parameters and FIR luminosities from carefully constructed control samples of galaxies,...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1409.5122
9
9.0
Jun 30, 2018
06/18
by
G. B. Lansbury; D. M. Alexander; A. Del Moro; P. Gandhi; R. J. Assef; D. Stern; J. Aird; D. R. Ballantyne; M. Balokovic; F. E. Bauer; S. E. Boggs; W. N. Brandt; F. E. Christensen; W. W. Craig; M. Elvis; B. W. Grefenstette; C. J. Hailey; F. A. Harrison; R. C. Hickox; M. Koss; S. M. LaMassa; B. Luo; J. R. Mullaney; S. H. Teng; C. M. Urry; W. W. Zhang
texts
eye 9
favorite 0
comment 0
We present NuSTAR hard X-ray (3-79 keV) observations of three Type 2 quasars at z ~ 0.4-0.5, optically selected from the Sloan Digital Sky Survey (SDSS). Although the quasars show evidence for being heavily obscured Compton-thick systems on the basis of the 2-10 keV to [OIII] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (N_H) are poorly known. In this analysis: (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1402.2666
3
3.0
Jun 30, 2018
06/18
by
G. Drouart; C. De Breuck; J. Vernet; N. Seymour; M. Lehnert; P. Barthel; F. E. Bauer; E. Ibar; A. Galametz; M. Haas; N. Hatch; J. R. Mullaney; N. Nesvadba; B. Rocca-Volmerange; H. J. A. Rottgering; D. Stern; D. Wylezalek
texts
eye 3
favorite 0
comment 0
We present results from a survey of 70 radio galaxies (RGs) at redshifts 12.5 are higher than the sSFR of typical star-forming galaxies over the same redshift range but are similar or perhaps lower than the galaxy population for RGs at z
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1404.1080
6
6.0
Jun 30, 2018
06/18
by
G. Leloudas; S. Schulze; T. Kruehler; J. Gorosabel; L. Christensen; A. Mehner; A. de Ugarte Postigo; R. Amorin; C. C. Thoene; J. P. Anderson; F. E. Bauer; A. Gallazzi; K. G. Helminiak; J. Hjorth; E. Ibar; D. Malesani; N. Morrell; J. Vinko; J. C. Wheeler
texts
eye 6
favorite 0
comment 0
Superluminous supernovae (SLSNe) are very bright explosions that were only discovered recently and that show a preference for occurring in faint dwarf galaxies. Understanding why stellar evolution yields different types of stellar explosions in these environments is fundamental in order to both uncover the elusive progenitors of SLSNe and to study star formation in dwarf galaxies. In this paper, we present the first results of our project to study SUperluminous Supernova Host galaxIES, focusing...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1409.8331
4
4.0
Jun 30, 2018
06/18
by
G. Yang; Y. Q. Xue; B. Luo; W. N. Brandt; D. M. Alexander; F. E. Bauer; W. Cui; X. Kong; B. D. Lehmer; J. -X. Wang; X. -B. Wu; F. Yuan; Y. -F. Yuan; H. Y. Zhou
texts
eye 4
favorite 0
comment 0
We derive photometric redshifts (\zp) for sources in the entire ($\sim0.4$ deg$^2$) Hawaii-Hubble Deep Field-North (\hdfn) field with the EAzY code, based on point spread function-matched photometry of 15 broad bands from the ultraviolet (\bandu~band) to mid-infrared (IRAC 4.5 $\mu$m). Our catalog consists of a total of 131,678 sources. We evaluate the \zp~quality by comparing \zp~with spectroscopic redshifts (\zs) when available, and find a value of normalized median absolute deviation...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1410.6860
6
6.0
Jun 30, 2018
06/18
by
M. Baloković; A. Comastri; F. A. Harrison; D. M. Alexander; D. R. Ballantyne; F. E. Bauer; S. E. Boggs; W. N. Brandt; M. Brightman; F. E. Christensen; W. W. Craig; A. Del Moro; P. Gandhi; C. J. Hailey; M. Koss; G. B. Lansbury; B. Luo; G. M. Madejski; A. Marinucci; G. Matt; C. B. Markwardt; S. Puccetti; C. S. Reynolds; G. Risaliti; E. Rivers; D. Stern; D. J. Walton; W. W. Zhang
texts
eye 6
favorite 0
comment 0
We present X-ray spectral analyses for three Seyfert 2 active galactic nuclei, NGC 424, NGC 1320, and IC 2560, observed by NuSTAR in the 3-79 keV band. The high quality hard X-ray spectra allow detailed modeling of the Compton reflection component for the first time in these sources. Using quasi-simultaneous NuSTAR and Swift/XRT data, as well as archival XMM-Newton data, we find that all three nuclei are obscured by Compton-thick material with column densities in excess of ~5 x $10^{24}$...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1408.5414
7
7.0
Jun 30, 2018
06/18
by
N. Laporte; A. Streblyanska; S. Kim; R. Pelló; F. E. Bauer; D. Bina; G. Brammer; M. A. De Leo; L. Infante; I. Pérez-Fournon
texts
eye 7
favorite 0
comment 0
(Abridged) The HST Frontier Fields project started at the end of 2013 with the aim of providing extremely deep images of 6 massive galaxy clusters. One of the main goals of this program is to push several telescopes to their limits in order to provide the best current view of the earliest stages of the Universe. We present a detailed analysis of $z$$\sim$8 objects behind the HFFs lensing cluster, MACS0416-2403, combining 0.3-1.6 $\mu$m imaging from HST, ground-based $K_s$ imaging from VLT...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1412.1089
5
5.0
Jun 30, 2018
06/18
by
P. Arévalo; F. E. Bauer; S. Puccetti; D. J. Walton; M. Koss; S. E. Boggs; W. N. Brandt; M. Brightman; F. E. Christensen; A. Comastri; W. W. Craig; F. Fuerst; P. Gandhi; B. W. Grefenstette; C. J. Hailey; F. A. Harrison; B. Luo; G. Madejski; K. K. Madsen; A. Marinucci; G. Matt; C. Saez; D. Stern; M. Stuhlinger; E. Treister; C. M. Urry; W. W. Zhang
texts
eye 5
favorite 0
comment 0
The Circinus galaxy is one of the nearest obscured AGN, making it an ideal target for detailed study. Combining archival Chandra and XMM-Newton data with new NuSTAR observations, we model the 2-79 keV spectrum to constrain the primary AGN continuum and to derive physical parameters for the obscuring material. Chandra's high angular resolution allows a separation of nuclear and off-nuclear galactic emission. In the off-nuclear diffuse emission we find signatures of strong cold reflection,...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1406.3345
8
8.0
Jun 30, 2018
06/18
by
P. Gandhi; G. B. Lansbury; D. M. Alexander; D. Stern; P. Arévalo; D. R. Ballantyne; M. Baloković; F. E. Bauer; S. E. Boggs; W. N. Brandt; M. Brightman; F. E. Christensen; A. Comastri; W. W. Craig; A. Del Moro; M. Elvis; A. C. Fabian; C. J. Hailey; F. A. Harrison; R. C. Hickox; M. Koss; S. M. LaMassa; B. Luo; G. M. Madejski; A. F. Ptak; S. Puccetti; S. H. Teng; C. M. Urry; D. J. Walton; W. W. Zhang
texts
eye 8
favorite 0
comment 0
We present Nustar 3-40 keV observations of the optically selected Type 2 quasar (QSO2) SDSS J1034+6001 or Mrk 34. The high-quality hard X-ray spectrum and archival XMM-Newton data can be fitted self-consistently with a reflection-dominated continuum and strong Fe Kalpha fluorescence line with equivalent-width >1 keV. Prior X-ray spectral fitting below 10 keV showed the source to be consistent with being obscured by Compton-thin column densities of gas along the line-of-sight, despite...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics, Cosmology and...
Source: http://arxiv.org/abs/1407.1844
4
4.0
Jun 30, 2018
06/18
by
T. X. Thuan; F. E. Bauer; Y. I. Izotov
texts
eye 4
favorite 0
comment 0
We present XMM-Newton and Chandra observations of two low-metallicity cometary blue compact dwarf (BCD) galaxies, Mrk 59 and Mrk 71. The first BCD, Mrk 59, contains two ultraluminous X-ray (ULX) sources, IXO 72 and IXO 73, both associated with bright massive stars and H II complexes, as well as one fainter extended source associated with a massive H II complex at the head of the cometary structure. The low-metallicity of Mrk 59 appears to be responsible for the presence of the two ULXs. IXO 72...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1404.2587
4
4.0
Jun 30, 2018
06/18
by
W. Zheng; X. Shu; J. Moustakas; A. Zitrin; H. C. Ford; X. Huang; T. Broadhurst; A. Molino; J. M. Diego; L. Infante; F. E. Bauer; D. D. Kelson; R. Smit
texts
eye 4
favorite 0
comment 0
We report the discovery of 24 Lyman-break candidates at 7
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1402.6743
