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dc.creatorTreister, Ezequielen_US
dc.creatorVirani, Shanilen_US
dc.creatorGawiser, Ericen_US
dc.creatorUrry, C. Meganen_US
dc.creatorLira, Paulinaen_US
dc.creatorFrancke, Ilarolden_US
dc.creatorBlanc, Guillermo A.en_US
dc.creatorCardamone, Carolin N.en_US
dc.creatorDamen, Maaikeen_US
dc.creatorTaylor, Edward N.en_US
dc.creatorSchawinski, Kevinen_US
dc.date.accessioned2016-04-28T19:34:08Z
dc.date.available2016-04-28T19:34:08Z
dc.date.issued2009-03en
dc.identifierdoi:10.15781/T2T808
dc.identifier.citationTreister, Ezequiel, Shanil Virani, Eric Gawiser, C. Megan Urry, Paulina Lira, Harold Francke, Guillermo A. Blanc et al. "Optical spectroscopy of X-ray sources in the extended Chandra deep field south." The Astrophysical Journal, Vol. 693, No. 2 (Mar., 2009): 1713.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34766
dc.description.abstractWe present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and a literature search. We find that the active galactic nucleus (AGN) host galaxies have on average redder rest-frame optical colors than nonactive galaxies, and that they live mostly in the "green valley." The dependence of the fraction of AGNs that are obscured on both luminosity and redshift is confirmed at high significance and the observed AGN spatial density is compared with the expectations from existing luminosity functions. These AGNs show a significant difference in the mid-IR to X-ray flux ratio for obscured and unobscured AGNs, which can be explained by the effects of dust self-absorption on the former. This difference is larger for lower luminosity sources, which is consistent with the dust opening angle depending on AGN luminosity.en_US
dc.description.sponsorshipNational Aeronautics and Space Administration PF8-90055, NAS8-03060en_US
dc.description.sponsorshipNSF AST0407295en_US
dc.description.sponsorshipSpitzer JPL RSA1288440en_US
dc.description.sponsorshipNatural Science and Engineering Research Council of Canada (NSERC)en_US
dc.description.sponsorshipNational Academy of Sciencesen_US
dc.description.sponsorshipNASA/INTEGRAL NNG05GM79Gen_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectgalaxies: activeen_US
dc.subjectquasars: generalen_US
dc.subjectx-rays: galaxiesen_US
dc.subjectactive galactic nucleien_US
dc.subjectobscuring dust torien_US
dc.subjectearly-type galaxiesen_US
dc.subjectseyfert 2 galaxiesen_US
dc.subjecteso imaging surveyen_US
dc.subjectearly data releaseen_US
dc.subjectxmm-newtonen_US
dc.subjectvlt/fors2 spectroscopyen_US
dc.subjectluminosity functionen_US
dc.subjectstar-formationen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleOptical Spectroscopy Of X-Ray Sources In The Extended Chandra Deep Field Southen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2009_03_opticalspectroscopy.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/693/2/1713en_US
dc.contributor.utaustinauthorBlanc, Guillermo A.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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