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Arxiv.org

13 13

The XMM deep survey in the CDF-S. IX. An X-ray outflow in a luminous obscured quasar at z~1.6

Jun 28, 2018 06/18

by C. Vignali; K. Iwasawa; A. Comastri; R. Gilli; G. Lanzuisi; P. Ranalli; N. Cappelluti; V. Mainieri; I. Georgantopoulos; F. J. Carrera; J. Fritz; M. Brusa; W. N. Brandt; F. E. Bauer; F. Fiore; F. Tombesi

eye 13

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In active galactic nuclei (AGN)-galaxy co-evolution models, AGN winds and outflows are often invoked to explain why super-massive black holes and galaxies stop growing efficiently at a certain phase of their lives. They are commonly referred to as the leading actors of feedback processes. Evidence of ultra-fast (v>0.05c) outflows in the innermost regions of AGN has been collected in the past decade by sensitive X-ray observations for sizable samples of AGN, mostly at low redshift. Here we...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1509.05413

Arxiv.org

44 44

X-rays from the High-Redshift Universe: The Chandra view

Sep 18, 2013 09/13

by C. Vignali; W. N. Brandt; D. P. Schneider; G. P. Garmire; S. Kaspi; F. E. Bauer; D. M. Alexander

eye 44

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The study of the X-ray properties of z>4 quasars has grown substantially over the last few years, mostly thanks to Chandra. Here we focus on (1) the average X-ray properties of an optically selected, luminous sample of nine z>4 Palomar Digital Sky Survey quasars recently observed by Chandra, and (2) the X-ray spectral properties of three z>4 AGNs in the Chandra Deep Field-North (CDF-N) using the 2 Ms exposure.
Source: http://arxiv.org/abs/astro-ph/0210309v1

Arxiv.org

51 51

Supermassive Black Hole Growth in Starburst Galaxies over Cosmic Time: Constraints from the Deepest Chandra Fields

Sep 21, 2013 09/13

by D. A. Rafferty; W. N. Brandt; D. M. Alexander; Y. Q. Xue; F. E. Bauer; B. D. Lehmer; B. Luo; C. Papovich

eye 51

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We present an analysis of deep multiwavelength data for z ~ 0.3-3 starburst galaxies selected by their 70 um emission in the Extended-Chandra Deep Field-South and Extended Groth Strip. We identify active galactic nuclei (AGNs) in these infrared sources through their X-ray emission and quantify the fraction that host an AGN. We find that the fraction depends strongly on both the mid-infrared color and rest-frame mid-infrared luminosity of the source, rising to ~ 50-70% at the warmest colors and...
Source: http://arxiv.org/abs/1108.3229v1

Arxiv.org

4 4.0

Searching for molecular outflows in Hyper-Luminous Infrared Galaxies

Jun 29, 2018 06/18

by D. Calderón; F. E. Bauer; S. Veilleux; J. Graciá-Carpio; E. Sturm; P. Lira; S. Schulze; S. Kim

eye 4

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We present constraints on the molecular outflows in a sample of five Hyper-Luminous Infrared Galaxies using Herschel observations of the OH doublet at 119 {\mu}m. We have detected the OH doublet in three cases: one purely in emission and two purely in absorption. The observed emission profile has a significant blueshifted wing suggesting the possibility of tracing an outflow. Out of the two absorption profiles, one seems to be consistent with the systemic velocity while the other clearly...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1605.05364

Arxiv.org

8 8.0

The host galaxies of X-ray selected Active Galactic Nuclei to z=2.5: Structure, star-formation and their relationships from CANDELS and Herschel/PACS

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;...

eye 8

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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

Arxiv.org

44 44

Nuclear Activity is more prevalent in Star-Forming Galaxies

Sep 22, 2013 09/13

by D. J. Rosario; P. Santini; D. Lutz; H. Netzer; F. E. Bauer; S. Berta; B. Magnelli; P. Popesso; D. Alexander; W. N. Brandt; R. Genzel; R. Maiolino; J. R. Mullaney; R. Nordon; A. Saintonge; L. Tacconi; S. Wuyts

eye 44

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We explore the question of whether low and moderate luminosity Active Galactic Nuclei (AGNs) are preferentially found in galaxies that are undergoing a transition from active star formation to quiescence. This notion has been suggested by studies of the UV-to-optical colors of AGN hosts, which find them to be common among galaxies in the so-called "Green Valley", a region of galaxy color space believed to be composed mostly of galaxies undergoing star-formation quenching. Combining...
Source: http://arxiv.org/abs/1302.1202v2

Arxiv.org

112 112

The Mean Star Formation Rate of X-ray selected Active Galaxies and its Evolution from z=2.5: Results from PEP-Herschel

Jul 20, 2013 07/13

by D. J. Rosario; P. Santini; D. Lutz; L. Shao; R. Maiolino; D. M. Alexander; B. Altieri; P. Andreani; H. Aussel; F. E. Bauer; S. Berta; A. Bongiovanni; W. N. Brandt; M. Brusa; J. Cepa; A. Cimatti; T. J. Cox; E. Daddi; D. Elbaz; A. Fontana; N. M. Förster Schreiber; R. Genzel; A. Grazian; E. Le Floch; B. Magnelli; V. Mainieri; H. Netzer; R. Nordon; I. Pérez Garcia; A. Poglitsch; P. Popesso; F. Pozzi; L. Riguccini; G. Rodighiero; M. Salvato; M. Sanchez-Portal; E. Sturm; L. J. Tacconi; I....

eye 112

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(Abridged) We study relationships between the SFR and the nuclear properties of X-ray selected AGNs out to z=2.5, using far-IR data in three extragalactic deep fields as part of the PACS Evolutionary Probe (PEP) program. Guided by studies of intrinsic infra-red AGN SEDs, we show that the majority of the FIR emission in AGNs is produced by cold dust heated by star-formation. We uncover characteristic redshift-dependent trends between the mean FIR luminosity (L_fir) and accretion luminosity...
Source: http://arxiv.org/abs/1203.6069v2

Arxiv.org

43 43

The Chandra Deep Field North Survey. X. X-ray Emission from Very Red Objects

Sep 22, 2013 09/13

by D. M. Alexander; C. Vignali; F. E. Bauer; W. N. Brandt; A. E. Hornschemeier; G. P. Garmire; D. P. Schneider

eye 43

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The multi-wavelength properties of Very Red Objects (VROs; I-K>=4) are largely unknown as many of these sources are optically faint (I>=24) and undetected at most wavelengths. Here we provide constraints on the X-ray properties of VROs using the 1 Ms Chandra exposure of an 8.4'x8.4' region within the Hawaii Flanking-Field area containing the HDF-N. We find that VROs detected in the hard band (2-8 keV) have flat X-ray spectral slopes (Gamma ~ 0.9) and X-ray properties consistent with those...
Source: http://arxiv.org/abs/astro-ph/0111397v1

Arxiv.org

68 68

Fact: Many SCUBA galaxies harbour AGNs

Sep 18, 2013 09/13

by D. M. Alexander; F. E. Bauer; S. C. Chapman; I. Smail; A. W. Blain; W. N. Brandt; R. J. Ivison

eye 68

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Deep SCUBA surveys have uncovered a large population of ultra-luminous galaxies at z>1. These sources are often assumed to be starburst galaxies, but there is growing evidence that a substantial fraction host an AGN (i.e., an accreting super-massive black hole). We present here possibly the strongest evidence for this viewpoint to date: the combination of ultra-deep X-ray observations (the 2 Ms Chandra Deep Field-North) and deep optical spectroscopic data. We argue that upward of 38% of...
Source: http://arxiv.org/abs/astro-ph/0401129v1

Arxiv.org

58 58

The X-ray Spectral Properties of SCUBA Galaxies

Sep 20, 2013 09/13

by D. M. Alexander; F. E. Bauer; S. C. Chapman; I. Smail; A. W. Blain; W. N. Brandt; R. J. Ivison

eye 58

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Deep SCUBA surveys have uncovered a large population of massive submm galaxies (SMGs) at z>~1. Although it is generally believed that these galaxies host intense star-formation activity, there is growing evidence that a substantial fraction also harbor an AGN. We present here possibly the strongest evidence for this viewpoint to date: the combination of ultra-deep X-ray observations (the 2 Ms CDF-N) and deep Keck spectroscopic data. We find that the majority (~75%) of the spectroscopically...
Source: http://arxiv.org/abs/astro-ph/0506608v1

Arxiv.org

45 45

The 2 Ms Chandra Deep Field-North: Moderate-luminosity AGNs and dusty starburst galaxies

Sep 22, 2013 09/13

by D. M. Alexander; F. E. Bauer; W. N. Brandt; A. E. Hornschemeier

eye 45

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The 2 Ms Chandra Deep Field-North survey provides the deepest view of the Universe in the 0.5--8.0 keV X-ray band. In this brief review we investigate the diversity of X-ray selected sources and focus on the constraints placed on AGNs (including binary AGNs) in high-redshift submm galaxies.
Source: http://arxiv.org/abs/astro-ph/0308079v1

Arxiv.org

37 37

Exotic sources detected in the 1 Ms Chandra Deep Field North Survey

Sep 18, 2013 09/13

by D. M. Alexander; F. E. Bauer; W. N. Brandt; A. E. Hornschemeier; C. Vignali; G. P. Garmire; D. P. Schneider

eye 37

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We provide constraints on optically faint (I>=24) X-ray sources, z>6 AGN, Very Red Objects (VROs; I-K>=4), and optically faint radio sources using the 1 Ms Chandra Deep Field North survey. We argue that the majority of the optically faint X-ray sources are obscured AGN at z=1-3. These sources comprise up to 50% of the X-ray detected AGN. Approximately 30% of the optically faint X-ray sources have properties consistent with those expected for z>6 AGN; however we argue that the...
Source: http://arxiv.org/abs/astro-ph/0202044v1

Arxiv.org

70 70

The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs

Sep 19, 2013 09/13

by D. M. Alexander; F. E. Bauer; W. N. Brandt; D. P. Schneider; A. E. Hornschemeier; C. Vignali; A. J. Barger; P. S. Broos; L. L. Cowie; G. P. Garmire; L. K. Townsley; M. W. Bautz; G. Chartas; W. L. W. Sargent

eye 70

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We present catalogs for the ~2 Ms Chandra Deep Field-North, currently the deepest X-ray observation of the Universe in the 0.5-8.0 keV band. Five hundred and three (503) X-ray sources are detected over an ~448 sq.arcmin area in up to seven bands; 20 of these X-ray sources lie in the Hubble Deep Field-North. Source positions are determined using matched-filter and centroiding techniques; the median positional uncertainty is ~0.3 arcsecs. The X-ray colors of the detected sources indicate a broad...
Source: http://arxiv.org/abs/astro-ph/0304392v1

Arxiv.org

51 51

X-ray Spectral Constraints for z~2 Massive Galaxies: The Identification of Reflection-Dominated Active Galactic Nuclei

Sep 21, 2013 09/13

by D. M. Alexander; F. E. Bauer; W. N. Brandt; E. Daddi; R. C. Hickox; B. D. Lehmer; B. Luo; Y. Q. Xue; M. Young; A. Comastri; A. Del Moro; A. C. Fabian; R. Gilli; A. D. Goulding; V. Mainieri; J. R. Mullaney; M. Paolillo; D. A. Rafferty; D. P. Schneider; O. Shemmer; C. Vignali

eye 51

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We use the 4Ms CDF-S survey to place direct X-ray constraints on the ubiquity of z~2 heavily obscured AGNs in K 1E43 erg/s) heavily obscured and Compton-thick AGNs at z~2. Our space-density constraints are conservative lower limits but they are already consistent with the range of predictions from X-ray background models.
Source: http://arxiv.org/abs/1106.1443v1

Arxiv.org

33 33

Resolving the Source Populations that Contribute to the X-ray Background: The 2 Ms Chandra Deep Field-North Survey

Sep 18, 2013 09/13

by D. M. Alexander; F. E. Bauer; W. N. Brandt; G. P. Garmire; A. E. Hornschemeier; D. P. Schneider; C. Vignali

eye 33

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With ~2 Ms of Chandra exposure, the Chandra Deep Field-North (CDF-N) survey provides the deepest view of the Universe in the 0.5-8.0 keV band. Five hundred and three (503) X-ray sources are detected down to on-axis 0.5-2.0 keV and 2-8 keV flux limits of ~1.5x10^{-17} erg cm^{-2} s^{-1} and ~1.0x10^{-16} erg cm^{-2} s^{-1}, respectively. These flux limits correspond to L_{0.5-8.0 keV}~3x10^{41} erg s^{-1} at z=1 and L_{0.5-8.0 keV}~2x10^{43} erg s^{-1} at z=6; thus this survey is sensitive...
Source: http://arxiv.org/abs/astro-ph/0210308v2

Arxiv.org

59 59

A Chandra observation of the z=2.285 galaxy FSC10214+4724: Evidence for a Compton-thick quasar?

Sep 23, 2013 09/13

by D. M. Alexander; G. Chartas; F. E. Bauer; W. N. Brandt; C. Simpson; C. Vignali

eye 59

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We present a ~20 ks Chandra ACIS-S observation of the strongly lensed z=2.285 ultra-luminous infrared galaxy FSC10214+4724. Although this observation achieves the equivalent sensitivity of an up-to ~4 Ms Chandra exposure (when corrected for gravitational lensing), the rest-frame 1.6-26.3 keV emission from FSC10214+4724 is weak (L_X~2E42 erg/s for a lensing boost of ~100); a significant fraction of this X-ray emission appears to be due to vigorous star-formation activity. If FSC10214+4724 hosts...
Source: http://arxiv.org/abs/astro-ph/0411289v1

Arxiv.org

47 47

The Chandra Deep Field North Survey. XI. X-ray emission from luminous infrared starburst galaxies

Sep 18, 2013 09/13

by D. M. Alexander; H. Aussel; F. E. Bauer; W. N. Brandt; A. E. Hornschemeier; C. Vignali; G. P. Garmire; D. P. Schneider

eye 47

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Using the 1 Ms Chandra Deep Field North and 15 micron ISOCAM HDF-N surveys we find a tight correlation between the population of strongly evolving starbursts discovered in faint 15 micron ISOCAM surveys and the apparently normal galaxy population detected in deep X-ray surveys. Up to 100% of the X-ray detected emission-line galaxies (ELGs) have 15 micron counterparts, in contrast to 10-20% of the X-ray detected absorption-line galaxies and AGN-dominated sources. None of the X-ray detected ELGs...
Source: http://arxiv.org/abs/astro-ph/0202493v1

Arxiv.org

48 48

Reliable Identification of Compton-thick Quasars at z~2: Spitzer Mid-IR spectroscopy of HDF-oMD49

Sep 18, 2013 09/13

by D. M. Alexander; R. R. Chary; A. Pope; F. E. Bauer; W. N. Brandt; E. Daddi; M. Dickinson; D. Elbaz; N. A. Reddy

eye 48

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Many models that seek to explain the origin of the unresolved X-ray background predict that Compton-thick Active Galactic Nuclei (AGNs) are ubiquitious at high redshift. However, few distant Compton-thick AGNs have been reliably identified to date. Here we present Spitzer-IRS spectroscopy and 3.6-70um photometry of a z=2.2 optically identified AGN (HDF-oMD49) that is formally undetected in the 2Ms Chandra Deep Field-North (CDF-N) survey. The Spitzer-IRS spectrum and spectral energy distribution...
Source: http://arxiv.org/abs/0803.0636v4

Arxiv.org

81 81

The Chandra Deep Field North Survey. VI. The Nature of the Optically Faint X-ray Source Population

Jul 20, 2013 07/13

by D. M. Alexander; W. N. Brandt; A. E. Hornschemeier; G. P. Garmire; D. P. Schneider; F. E. Bauer; R. E. Griffiths

eye 81

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We provide constraints on the nature of the optically faint (I>=24) X-ray source population from a 1 Ms Chandra exposure of a 8.4x8.4 arcmin region containing the Hubble Deep Field North. We detect 47 (2,400 deg^-2) optically faint X-ray sources. The fraction of optically faint X-ray sources is approximately constant (at approx 35%) for 0.5-8.0 keV fluxes from 3x10^-14 cgs down to the X-ray flux limit. A considerable fraction (approx 30%) of the sources are Very Red Objects (I-K>=4)....
Source: http://arxiv.org/abs/astro-ph/0107450v2

Arxiv.org

36 36

Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei

Sep 18, 2013 09/13

by D. M. Alexander; W. N. Brandt; I. Smail; A. M. Swinbank; F. E. Bauer; A. W. Blain; S. C. Chapman; K. E. K. Coppin; R. J. Ivison; K. Menendez-Delmestre

eye 36

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We place direct observational constraints on the black-hole masses of the cosmologically important z~2 submillimeter-emitting galaxy (SMG; f850>4mJy) population, and use measured host-galaxy masses to explore their evolutionary status. We employ the well-established virial black-hole mass estimator to 'weigh' the black holes of a sample of z~2 SMGs with broad Halpha or Hbeta emission. The average black-hole mass and Eddington ratio (eta) of the lower-luminosity broad-line SMGs (L_X~10^44...
Source: http://arxiv.org/abs/0803.0634v1

Arxiv.org

116 116

High Resolution Radio Imaging of Distant Submillimeter Galaxies

Jul 20, 2013 07/13

by E. A. Richards; F. E. Bauer; A. J. Barger; L. Cowie

eye 116

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Using a combination of radio and optical imaging at 0.1\arcs to 0.2\arcs resolution with the VLA/MERLIN and HST has led to a breakthrough in our understanding of radio emission from distant (0.1 4-6) and submillimeter sources with S > 2 mJy at 850 microns as measured with SCUBA on the JCMT. The far-infrared luminosities of these galaxies exceeds even the most intense starbursts found in the local universe (e.g., Arp 220), suggesting they are in the process of converting the bulk of their...
Source: http://arxiv.org/abs/astro-ph/9910497v2

Arxiv.org

28 28

The Chandra Deep Field-North Survey: XVII. Evolution of magnetic activity in old late-type stars

Sep 20, 2013 09/13

by E. D. Feigelson; A. E. Hornschemeier; G. Micela; F. E. Bauer; D. M. Alexander; W. N. Brandt; F. Favata; S. Sciortino; G. P. Garmire; Penn State; Johns Hopkins; Palermo; Cambridge; ESTEC

eye 28

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The extremely sensitive Chandra Deep Field-North (CDF-N) pencil-beam X-ray survey is used to identify and characterize the X-ray emission from old high-latitude main sequence Galactic stars. Our principal goal is to investigate the expected long-term decay of magnetic activity of late-type stars due to the gradual spindown of stellar rotation from a magnetized stellar wind. Eleven X-ray sources constitute a well-defined sample of 2 G, 2 K0-K4, and 7 M2-M5 stars with median distance around 300...
Source: http://arxiv.org/abs/astro-ph/0405026v1

Arxiv.org

46 46

Multiwavelength study of massive galaxies at z~2. II. Widespread Compton thick AGN and the concurrent growth of black holes and bulges

Sep 18, 2013 09/13

by E. Daddi; D. M. Alexander; M. Dickinson; R. Gilli; A. Renzini; D. Elbaz; A. Cimatti; R. Chary; D. Frayer; F. E. Bauer; W. N. Brandt; M. Giavalisco; N. A. Grogin; M. Huynh; J. Kurk; M. Mignoli; G. Morrison; A. Pope; S. Ravindranath

eye 46

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Approximately 20-30% of 1.46.2 keV. The stacked X-ray spectrum rises steeply at >10 keV, suggesting that these sources host Compton-thick Active Galactic Nuclei (AGNs) with column densities N_H~10^{24} cm^-2 and an average, unobscured X-ray luminosity L_{2-8 keV}~(1-4)x10^43 erg/s. Their sky density(~3200 deg^-2) and space density (~2.6x10^-4 Mpc^-3) are twice those of X-ray detected AGNs at z~2, and much larger than those of previously-known Compton thick sources at similar redshifts. The...
Source: http://arxiv.org/abs/0705.2832v2

Arxiv.org

50 50

Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth

Sep 18, 2013 09/13

by E. Daddi; M. Dickinson; G. Morrison; R. Chary; A. Cimatti; D. Elbaz; D. Frayer; A. Renzini; A. Pope; D. M. Alexander; F. E. Bauer; M. Giavalisco; M. Huynh; J. Kurk; M. Mignoli

eye 50

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Examining a sample of massive galaxies at 1.410^{11}L_sun, show a mid-IR excess which is likely due to the presence of obscured active nuclei, as shown in a companion paper. There is a tight and roughly linear correlation between stellar mass and SFR for 24um-detected galaxies. For a given mass, the SFR at z=2 was larger by a factor of ~4 and ~30 relative to that in star forming galaxies at z=1 and z=0, respectively. Typical ultraluminous infrared galaxies (ULIRGs) at z=2 are relatively...
Source: http://arxiv.org/abs/0705.2831v2

Arxiv.org

50 50

The population of BzK selected ULIRGs at z~2

Sep 19, 2013 09/13

by E. Daddi; M. Dickinson; R. Chary; A. Pope; G. Morrison; D. M. Alexander; F. E. Bauer; W. N. Brandt; M. Giavalisco; H. Ferguson; K. -S. Lee; C. Papovich; A. Renzini

eye 50

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We investigate the multi-wavelength emission of BzK selected star forming galaxies at z~2 in the Great Observatories Origins Deep Survey (GOODS) North region. Most (82%) of the sources are individually detected at 24um in the Spitzer MIPS imaging, and one fourth (26%) in the VLA radio data. Significant detections of the individually undetected objects are obtained through stacking in the radio, submm and X-ray domains. The typical star forming galaxy with stellar mass ~10^{11}Mo at z=2 is an...
Source: http://arxiv.org/abs/astro-ph/0507504v1

Arxiv.org

7 7.0

The NuSTAR view of reflection and absorption in NGC 7582

Jun 28, 2018 06/18

by E. Rivers; M. Baloković; P. Arévalo; F. E. Bauer; S. E. Boggs; W. N. Brandt; M. Brightman; F. E. Christensen; W. W. Craig; P. Gandhi; C. J. Hailey; F. Harrison; M. Koss; C. Ricci; D. Stern; D. J. Walton; W. W. Zhang

eye 7

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NGC 7582 is a well-studied X-ray bright Seyfert 2 with moderately heavy ($N_{\text{H}}\sim10^{23}-10^{24}$~cm$^{-2}$), highly variable absorption and strong reflection spectral features. The spectral shape changed around the year 2000, dropping in observed flux and becoming much more highly absorbed. Two scenarios have been put forth to explain this spectral change: 1) the central X-ray source partially ``shut off'' around this time, decreasing in intrinsic luminosity, with a delayed decrease...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.01951

Arxiv.org

9 9.0

The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background

Jun 28, 2018 06/18

by F. A. Harrison; J. Aird; F. Civano; G. Lansbury; J. R. Mullaney; D. R. Ballantyne; D. M. Alexander; D. Stern; M. Ajello; D. Barret; F. E. Bauer; M. Balokovic; W. N. Brandt; M. Brightman; S. E. Boggs; F. E. Christensen; A. Comastri; W. W. Craig; A. Del Moro; K. Forster; P. Gandhi; P. Giommi; B. W. Grefenstette; C. J. Hailey; R. C. Hickox; A. Hornstrup; T. Kitaguchi; J. Koglin; B. Luo; K. K. Madsen; P. H. Mao; H. Miyasaka; K. Mori; M. Perri; M. Pivovaroff; S. Puccetti; V. Rana; E. Treister; D....

eye 9

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We present the 3-8 keV and 8-24 keV number counts of active galactic nuclei (AGN) identified in the NuSTAR extragalactic surveys. NuSTAR has now resolved 33-39% of the X-ray background in the 8-24 keV band, directly identifying AGN with obscuring columns up to approximately 1e25 /cm2. In the softer 3-8 keV band the number counts are in general agreement with those measured by XMM-Newton and Chandra over the flux range 5e-15 < S(3 - 8 keV)/(erg/cm2/s) < 1e-12 probed by NuSTAR. In the hard...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.04183

Arxiv.org

7 7.0

The NuSTAR Extragalactic Surveys: Overview and Catalog from the COSMOS Field

Jun 28, 2018 06/18

by F. Civano; R. C. Hickox; S. Puccetti; A. Comastri; J. R. Mullaney; L. Zappacosta; S. M. LaMassa; J. Aird; D. M. Alexander; D. R. Ballantyne; F. E. Bauer; W. N. Brandt; S. E. Boggs; F. E. Christensen; W. W. Craig; A. Del-Moro; M. Elvis; K. Forster; P. Gandhi; B. W. Grefenstette; C. J. Hailey; F. A. Harrison; G. B. Lansbury; B. Luo; K. Madsen; C. Saez; D. Stern; E. Treister; M. C. Urry; D. R. Wik; W. Zhang

eye 7

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To provide the census of the sources contributing to the X-ray background peak above 10 keV, NuSTAR is performing extragalactic surveys using a three-tier "wedding cake" approach. We present the NuSTAR survey of the COSMOS field, the medium sensitivity and medium area tier, covering 1.7 deg2 and overlapping with both Chandra and XMM-Newton data. This survey consists of 121 observations for a total exposure of ~3 Ms. To fully exploit these data, we developed a new detection strategy,...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.04185

Arxiv.org

62 62

X-ray Properties of the Abell 644 Cluster of Galaxies

Sep 23, 2013 09/13

by F. E. Bauer; C. L. Sarazin

eye 62

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We use new ASCA observations and archival ROSAT Position Sensitive Proportional Counter (PSPC) data to determine the X-ray spectral properties of the intracluster gas in Abell 644. From the overall spectrum, we determine the average gas temperature to be 8.64 (+0.67,-0.56) keV, and an abundance of 0.32 (+/-0.04) $Z_{\odot}$. The global ASCA and ROSAT spectra imply a cooling rate of 214 (+100,-91) $M_{\odot}$ yr$^{-1}$. The PSPC X-ray surface brightness profile and the ASCA data suggest a...
Source: http://arxiv.org/abs/astro-ph/9909274v1

Arxiv.org

43 43

The AGN Source Population in the Chandra Deep Field-North Survey: Constraints from X-ray Spectroscopy and Variability

Sep 18, 2013 09/13

by F. E. Bauer; C. Vignali; D. M. Alexander; W. N. Brandt; G. P. Garmire; A. E. Hornschemeier; P. Broos; L. Townsley; D. P. Schneider

eye 43

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We briefly report here on our ongoing X-ray spectroscopy and variability analyses of 136 faint X-ray sources discovered in the 2 Ms Chandra Deep Field North observations spanning 1.4x10-15 to 2x10-13 ergs s-1 cm-2. Most sources are adequatley fitted with a simple intrinsic absorption plus power-law model, although the resulting photon index is much lower than the canonical average unabsorbed spectral slope found locally (suggesting additional spectral complexity). Among the 136 sources, 7% show...
Source: http://arxiv.org/abs/astro-ph/0210310v1

Arxiv.org

44 44

X-ray Spectroscopy and Variability of AGN Detected in the 2 Ms Chandra Deep Field-North Survey

Sep 18, 2013 09/13

by F. E. Bauer; C. Vignali; D. M. Alexander; W. N. Brandt; G. P. Garmire; A. E. Hornschemeier; P. S. Broos; L. K. Townsley; D. P. Schneider

eye 44

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We investigate the nature of the faint X-ray source population through X-ray spectroscopy and variability analyses of 136 AGN detected in the 2 Ms Chandra Deep Field-North survey with > 200 background-subtracted 0.5-8.0 keV counts [F(0.5-8.0 keV)=(1.4-200)e-15 erg cm^{-2} s^{-1}]. Our preliminary spectral analyses yield median spectral parameters of Gamma=1.61 and intrinsic N_H=6.2e21 cm^{-2} (z=1 assumed when no redshift available) when the AGN spectra are fitted with a simple absorbed...
Source: http://arxiv.org/abs/astro-ph/0212389v1

Arxiv.org

39 39

The Chandra Deep Field North Survey. XII. The Link Between Faint X-ray and Radio Source Populations

Sep 17, 2013 09/13

by F. E. Bauer; D. M. Alexander; W. N. Brandt; A. E. Hornschemeier; C. Vignali; G. P. Garmire; D. P. Schneider

eye 39

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We investigate the relationship between faint X-ray and 1.4 GHz radio source populations detected within 3' of the Hubble Deep Field North using the 1 Ms Chandra and 40 uJy VLA surveys. Within this region, we find that ~42% of the 62 X-ray sources have radio counterparts and ~71% of the 28 radio sources have X-ray counterparts; thus a 40 uJy VLA survey at 1.4 GHz appears to be well-matched to a 1 Ms Chandra observation. Among the different source populations sampled, we find that the majority...
Source: http://arxiv.org/abs/astro-ph/0207433v1

Arxiv.org

65 65

The Fall of AGN and the Rise of Star-Forming Galaxies: A Close Look at the Chandra Deep Field X-ray Number Counts

Sep 23, 2013 09/13

by F. E. Bauer; D. M. Alexander; W. N. Brandt; D. P. Schneider; E. Treister; A. E. Hornschemeier; G. P. Garmire

eye 65

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We investigate the X-ray number counts in the 1-2 Ms Chandra Deep Fields (CDFs) to determine the contributions of faint X-ray source populations to the extragalactic X-ray background (XRB). X-ray sources were separated into Active Galactic Nuclei (AGN), star-forming galaxies, and Galactic stars based on several criteria. We find that AGN continue to dominate the number counts in the 0.5-2.0 keV and 2-8 keV bands. At flux limits of ~2.5e-17 erg cm-2 s-1 (0.5-2.0 keV) and ~1.4e-16 erg cm-2 s-1...
Source: http://arxiv.org/abs/astro-ph/0408001v2

Arxiv.org

5 5.0

A New, Faint Population of X-ray Transients

Jun 30, 2018 06/18

by F. E. Bauer; E. Treister; K. Schawinski; S. Schulze; B. Luo; D. M. Alexander; W. N. Brandt; A. Comastri; F. Forster; R. Gilli; D. A. Kann; K. Maeda; K. Nomoto; M. Paolillo; P. Ranalli; D. P. Schneider; O. Shemmer; M. Tanaka; A. Tolstov; N. Tominaga; P. Tozzi; C. Vignali; J. Wang; Y. Xue; G. Yang

eye 5

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We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint ($m_{\rm R}=27.5$ mag, $z_{\rm ph}$$\sim$2.2) host in the CANDELS survey. The X-ray event is comprised of 115$^{+12}_{-11}$ net 0.3-7.0 keV counts, with a light curve characterised by a $\approx$100 s rise time, a peak 0.3-10 keV flux of $\approx$5$\times$10$^{-12}$ erg s$^{-1}$ cm$^{-2}$, and a power-law decay time slope of $-1.53\pm0.27$. The...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1702.04422

Arxiv.org

150 150

RBSC-NVSS Sample. I. Radio and Optical Identifications of a Complete Sample of 1500 Bright X-ray Sources

Sep 22, 2013 09/13

by F. E. Bauer; J. J. Condon; T. X. Thuan; J. J. Broderick

eye 150

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We cross-identified the ROSAT Bright Source Catalog (RBSC) and the NRAO VLA Sky Survey (NVSS) to construct the RBSC-NVSS sample of the brightest X-ray sources (>= 0.1 counts/s or ~1E-12 ergs/cm/cm/s in the 0.1-2.4 keV band) that are also radio sources (S >= 2.5 mJy at 1.4 GHz) in the 7.8 sr of extragalactic sky with |b| > 15 degrees. and delta > -40 degrees. The sky density of NVSS sources is low enough that they can be reliably identified with RBSC sources having average rms...
Source: http://arxiv.org/abs/astro-ph/0003002v1

Arxiv.org

50 50

X-ray Constraints on the AGN Properties in Spitzer-IRS identified z~2 Ultraluminous Infrared Galaxies

Sep 17, 2013 09/13

by F. E. Bauer; Lin Yan; A. Sajina; D. M. Alexander

eye 50

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We report X-ray constraints for 20 of 52 high-z ULIRGs identified in the Spitzer xFLS to constrain their obscuration. Notably, decomposition of Spitzer-IRS spectra for the 52 objects already indicates that most are weak-PAH ULIRGs dominated by hot-dust continua, characteristic of AGN. Given their redshifts, they have AGN bolometric luminosities of ~1e45-1e47 erg/s comparable to powerful QSOs. This, coupled with their high IR-to-optical ratios and often significant silicate absorption, strongly...
Source: http://arxiv.org/abs/0912.4267v1

Arxiv.org

66 66

SN 1996cr: Confirmation of a Luminous Type IIn Supernova in the Circinus Galaxy

Sep 18, 2013 09/13

by F. E. Bauer; S. Smartt; S. Immler; W. N. Brandt; K. W. Weiler

eye 66

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We have recently confirmed SN 1996cr as a late-time type IIn supernova (SN) via VLT spectroscopy and isolated its explosion date to ~1 yr using archival optical imaging. We briefly touch upon here the wealth of optical, X-ray, and radio archival observations available for this enigmatic source. Due to its relative proximity (3.8 +/-0.6 Mpc), SN 1996cr ranks among the brightest X-ray and radio SNe ever detected and, as such, may offer powerful insights into the structure and composition of type...
Source: http://arxiv.org/abs/0705.3057v1

Arxiv.org

77 77

Supernova 1996cr: SN 1987A's Wild Cousin?

Jul 20, 2013 07/13

by F. E. Bauer; V. V. Dwarkadas; W. N. Brandt; S. Immler; S. Smartt; N. Bartel; M. F. Bietenholz

eye 77

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We report on new VLT optical spectroscopic and multi-wavelength archival observations of SN1996cr, a previously identified ULX known as Circinus Galaxy X-2. Our optical spectrum confirms SN1996cr as a bona fide type IIn SN, while archival imaging isolates its explosion date to between 1995-02-28 and 1996-03-16. SN1996cr is one of the closest SNe (~3.8 Mpc) in the last several decades and in terms of flux ranks among the brightest radio and X-ray SNe ever detected. The wealth of optical, X-ray,...
Source: http://arxiv.org/abs/0804.3597v3

Arxiv.org

49 49

Chandra and HST Confirmation of the Luminous and Variable X-ray Source IC 10 X-1 as a Possible Wolf-Rayet, Black-Hole Binary

Sep 22, 2013 09/13

by F. E. Bauer; W. N. Brandt

eye 49

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We present a Chandra and HST study of IC 10 X-1, the most luminous X-ray binary in the closest starburst galaxy to the Milky Way. Our new hard X-ray observation of X-1 confirms that it has an average 0.5-10 keV luminosity of 1.5e38 erg/s, is strongly variable (a factor of ~2 in >3 ks), and is spatially coincident (within 0.'23 +/-0.'30) with the Wolf-Rayet (WR) star [MAC92] 17A in IC 10. The spectrum of X-1 is best fit by a power law with photon index of ~1.8 and a thermal plasma with kT~1.5...
Source: http://arxiv.org/abs/astro-ph/0310039v1

Arxiv.org

47 47

The X-ray Properties of the Nearby Star-Forming Galaxy IC 342: The XMM-Newton View

Sep 22, 2013 09/13

by F. E. Bauer; W. N. Brandt; B. Lehmer

eye 47

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We present the X-ray properties of IC342 using XMM-Newton. Thirty-five sources are detected coincident with the disk of IC342 (more than tripling the number known), of which ~31 are likely to be intrinsic to IC342. This population shows a range of spectral properties and has an X-ray luminosity function slope and infrared luminosity comparable to that of starburst galaxies such as M82 and the Antennae, while its relative lack of extended X-ray emission is similar to the properties of quiescent...
Source: http://arxiv.org/abs/astro-ph/0308278v1

Arxiv.org

44 44

A Chandra Study of the Circinus Galaxy Point-Source Population

Sep 21, 2013 09/13

by F. E. Bauer; W. N. Brandt; R. M. Sambruna; G. Chartas; G. P. Garmire; S. Kaspi; H. Netzer

eye 44

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We have used the Chandra X-ray Observatory to resolve spatially and spectrally the X-ray emission from the Circinus Galaxy. We report here on the nature of the X-ray emission from the off-nuclear point sources associated with the disk of Circinus. We find that many of the serendipitous X-ray sources are concentrated along the optical disk of the galaxy, but few have optical counterparts within 1" of their X-ray positions down to V=23-25. At 3.8 Mpc, their intrinsic 0.5-10 keV luminosities...
Source: http://arxiv.org/abs/astro-ph/0104035v1

Arxiv.org

49 49

The XMM-Newton serendipitous survey IV. The AXIS X-ray source counts and angular clustering

Sep 19, 2013 09/13

by F. J. Carrera; J. Ebrero; S. Mateos; M. T. Ceballos; A. Corral; X. Barcons; M. J. Page; S. R. Rosen; M. G. Watson; J. Tedds; R. Della Ceca; T. Maccacaro; H. Brunner; M. Freyberg; G. Lamer; F. E. Bauer; Y. Ueda

eye 49

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AXIS (An XMM-Newton International Survey) is a survey of 36 high Galactic latitude XMM-Newton observations covering 4.8 deg2 and containing 1433 serendipitous X-ray sources detected with 5-sigma significance. We have studied the X-ray source counts in four energy bands soft (0.5-2 keV), hard (2-10 keV), XID (0.5-4.5 keV) and ultra-hard (4.5-7.5 keV). We have combined this survey with shallower and deeper surveys. Our source counts results are compatible with most previous samples in the soft,...
Source: http://arxiv.org/abs/astro-ph/0703451v1

Arxiv.org

12 12

The NuSTAR X-ray spectrum of the low-luminosity AGN in NGC 7213

Jun 28, 2018 06/18

by F. Ursini; A. Marinucci; G. Matt; S. Bianchi; A. Tortosa; D. Stern; P. Arévalo; D. R. Ballantyne; F. E. Bauer; A. C. Fabian; F. A. Harrison; A. M. Lohfink; C. S. Reynolds; D. J. Walton

eye 12

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We present an analysis of the 3-79 keV NuSTAR spectrum of the low-luminosity active galactic nucleus NGC 7213. In agreement with past observations, we find a lower limit to the high-energy cut-off of Ec > 140 keV, no evidence for a Compton-reflected continuum, and the presence of an iron Kalpha complex, possibly produced in the broad-line region. From the application of the MYTorus model, we find that the line-emitting material is consistent with the absence of a significant Compton...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1507.01775

Arxiv.org

49 49

The high-redshift (z>3) AGN population in the 4 Ms Chandra Deep Field South

Sep 18, 2013 09/13

by F. Vito; C. Vignali; R. Gilli; A. Comastri; K. Iwasawa; W. N. Brandt; D. M. Alexander; M. Brusa; B. Lehmer; F. E. Bauer; D. P. Schneider; Y. Q. Xue; B. Luo

eye 49

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We present results from a spectral analysis of a sample of high-redshift (z>3) X-ray selected AGN in the 4 Ms Chandra Deep Field South (CDF-S), the deepest X-ray survey to date. The sample is selected using the most recent spectroscopic and photometric information available in this field. It consists of 34 sources with median redshift z=3.7, 80 median net counts in the 0.5-7 keV band and median rest-frame absorption-corrected luminosity $L_{2-10 \rmn{keV}}\approx1.5\times10^{44}\rmn{erg}...
Source: http://arxiv.org/abs/1209.4193v2

Arxiv.org

9 9.0

NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5

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

eye 9

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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

Arxiv.org

3 3.0

The NuSTAR Serendipitous Survey: The 40 month Catalog and the Properties of the Distant High Energy X-ray Source Population

Jun 29, 2018 06/18

by G. B. Lansbury; D. Stern; J. Aird; D. M. Alexander; C. Fuentes; F. A. Harrison; E. Treister; F. E. Bauer; J. A. Tomsick; M. Balokovic; A. Del Moro; P. Gandhi; M. Ajello; A. Annuar; D. R. Ballantyne; S. E. Boggs; N. Brandt; M. Brightman; C. J. Chen; F. E. Christensen; F. Civano; A. Comastri; W. W. Craig; K. Forster; B. W. Grefenstette; C. J. Hailey; R. Hickox; B. Jiang; H. Jun; M. Koss; S. Marchesi; A. D. Melo; J. R. Mullaney; G. Noirot; S. Schulze; D. J. Walton; L. Zappacosta; W. Zhang

eye 3

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We present the first full catalog and science results for the NuSTAR serendipitous survey. The catalog incorporates data taken during the first 40 months of NuSTAR operation, which provide ~20Ms of effective exposure time over 331 fields, with an areal coverage of 13 sq deg, and 497 sources detected in total over the 3-24 keV energy range. There are 276 sources with spectroscopic redshifts and classifications, largely resulting from our extensive campaign of ground-based spectroscopic followup....
Topics: Astrophysics, High Energy Astrophysical Phenomena, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1612.06389

Arxiv.org

16 16

NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars

Jun 28, 2018 06/18

by G. B. Lansbury; P. Gandhi; D. M. Alexander; R. J. Assef; J. Aird; A. Annuar; D. R. Ballantyne; M. Balokovic; F. E. Bauer; S. E. Boggs; W. N. Brandt; M. Brightman; F. E. Christensen; F. Civano; A. Comastri; W. W. Craig; A. Del Moro; B. W. Grefenstette; C. J. Hailey; F. A. Harrison; R. C. Hickox; M. Koss; S. M. LaMassa; B. Luo; S. Puccetti; D. Stern; E. Treister; C. Vignali; L. Zappacosta; W. W. Zhang

eye 16

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The intrinsic column density (NH) distribution of quasars is poorly known. At the high obscuration end of the quasar population and for redshifts z 1.5e24 cm^-2) type 2 quasars (CTQSO2s); five new NuSTAR observations are reported herein, and four have been previously published. The candidate CTQSO2s lie at z ~ 90 net source counts at 8-24 keV). For these NuSTAR-detected sources direct (i.e., X-ray spectral) constraints on the intrinsic AGN properties are feasible, and we measure column...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1506.05120

Arxiv.org

3 3.0

Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project

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

eye 3

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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

Arxiv.org

10 10.0

NuSTAR reveals the extreme properties of the super-Eddington accreting SMBH in PG 1247+267

Jun 29, 2018 06/18

by G. Lanzuisi; M. Perna; A. Comastri; M. Cappi; M. Dadina; A. Marinucci; A. Masini; G. Matt; F. Vagnetti; C. Vignali; D. R. Ballantyne; F. E. Bauer; S. E. Boggs; W. N. Brandt; M. Brusa; F. E. Christensen; W. W. Craig; A. C. Fabian; D. Farrah; C. J. Hailey; F. A. Harrison; B. Luo; E. Piconcelli; S. Puccetti; C. Ricci; C. Saez; D. Stern; D. J. Walton; W. W. Zhang

eye 10

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PG1247+267 is one of the most luminous known quasars at $z\sim2$ and is a strongly super-Eddington accreting SMBH candidate. We obtained NuSTAR data of this intriguing source in December 2014 with the aim of studying its high-energy emission, leveraging the broad band covered by the new NuSTAR and the archival XMM-Newton data. Several measurements are in agreement with the super-Eddington scenario for PG1247+267: the soft power law ($\Gamma=2.3\pm0.1$); the weak ionized Fe emission line and a...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1604.02462

Arxiv.org

6 6.0

Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies

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

eye 6

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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

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