J/ApJ/815/129ivo://CDS.VizieR/J/ApJ/815/129doi:10.26093/cds/vizier.18150129CDSSuh H.Hasinger G.Steinhardt C.Silverman J.D.Schramm M.2017-09-27T05:55:25Z2016-04-01T09:26:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesinfrared-astronomyspectroscopyredshiftedWe investigate the Eddington ratio distribution of X-ray-selected broad-line active galactic nuclei (AGNs) in the redshift range 1.0<z<2.2, where the number density of AGNs peaks. Combining the optical and Subaru/Fiber Multi Object Spectrograph near-infrared spectroscopy, we estimate black hole masses for broad-line AGNs in the Chandra Deep Field South (CDF-S), Extended Chandra Deep Field South (E-CDF-S), and the XMM-Newton Lockman Hole (XMM-LH) surveys. AGNs with similar black hole masses show a broad range of AGN bolometric luminosities, which are calculated from X-ray luminosities, indicating that the accretion rate of black holes is widely distributed. We find a substantial fraction of massive black holes accreting significantly below the Eddington limit at z<~2, in contrast to what is generally found for luminous AGNs at high redshift. Our analysis of observational selection biases indicates that the "AGN cosmic downsizing" phenomenon can be simply explained by the strong evolution of the comoving number density at the bright end of the AGN luminosity function, together with the corresponding selection effects. However, one might need to consider a correlation between the AGN luminosity and the accretion rate of black holes, in which luminous AGNs have higher Eddington ratios than low-luminosity AGNs, in order to understand the relatively small fraction of low-luminosity AGNs with high accretion rates in this epoch. Therefore, the observed downsizing trend could be interpreted as massive black holes with low accretion rates, which are relatively fainter than less-massive black holes with efficient accretion.2015ApJ...815..129Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/815/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/ApJ/764/45 : Luminosity function of broad-line quasars. II. (Kelly+, 2013)J/ApJ/761/143 : Black hole masses of z~1.4 AGNs from SXDS (Nobuta+, 2012)J/ApJ/759/6 : SEDs of type I AGN in COSMOS. I. XMM-COSMOS (Elvis+, 2012)J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)J/ApJS/198/1 : Photometry catalogs for the Lockman Hole (Fotopoulou+, 2012)J/A+A/535/A80 : Type-2 QSOs in XMM-COSMOS (Mainieri+, 2011)J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJS/194/42 : SDSS-DR3 MgII-based black hole masses (Rafiee+, 2011)J/ApJ/733/60 : Accretion rate of AGNs from COSMOS surveys (Trump+, 2011)J/A+A/529/A135 : AGN Opt/IR properties in Lockman Hole (Rovilos+, 2011)J/ApJS/191/124 : Optical spectro. of ECDF-S X-ray sources (Silverman+, 2010)J/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)J/A+A/512/A34 : XMM-COSMOS Type 1 AGNs (Lusso+, 2010)J/ApJ/708/137 : Broad-line AGNs in zCOSMOS survey (Merloni+, 2010)J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)J/ApJ/691/705 : AGN host galaxy morphologies in COSMOS (Gabor+, 2009)J/ApJ/690/20 : Models of the AGN and black hole populations (Shankar+, 2009)J/A+A/492/637 : Eddington ratios of faint AGN (Gavignaud+, 2008)J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)J/A+A/479/283 : XMM observations of the Lockman Hole (Brunner+, 2008)J/A+A/444/79 : XMM obs. of Lockman Hole brightest AGNs (Mateos+, 2005)J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005)J/ApJS/155/271 : CDF-South: Optical spectroscopy (Szokoly+, 2004)J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)J/A+A/371/833 : ROSAT Ultra Deep Survey (Lehmann+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/815/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/815/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/815/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/815/129https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/815/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/815/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/815/129/table2 (Subaru/FMOS spectroscopic observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/815/129/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/815/129/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/815/129/table2?GETtext/xml+votable180.050000true52.899-27.860.005555555555555556Cone search capability for table J/ApJ/815/129/table3 (Emission line properties of Broad-line AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/815/129/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/815/129/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/815/129/table3?GETtext/xml+votable180.050000true52.8990417-27.85963890.0055555555555555566/6047 6069 6112 35935 35957https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/815/129?format=asciiX-rayInfraredOpticaldefaultJ/ApJ/815/129/table2Subaru/FMOS spectroscopic observationsSimbadNameSimbad column added by the CDSmeta.idcharNEDnameSimbad column added by the CDSmeta.idcharn_zNote on z (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifier ("CDF-S", "E-CDF-S" or "XMM-LH")meta.id;obs.fieldcharID[1/2506] Source identifier within the Field (G1)meta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[0.2/5.2] Best redshift estimatesrc.redshiftfloatq_zQuality flag on z (2=reliable) (1)meta.code.qual;src.redshiftcharzspec[/4.5]? Previous spectroscopic redshiftsrc.redshiftfloatnullablezphot[/5.4]? Previous photometric redshiftsrc.redshiftfloatnullableBandBand used in the observation ("H-long" (1.60-1.80um), "H-short" (1.40-1.60um) or "J-long" (1.11-1.35um))instr.setup;obscharEmEmission features used to determine redshiftmeta.noteEEmission line propertiesmeta.ref.urlintnullableJ/ApJ/815/129/table3Emission line properties of Broad-line AGNsSimbadNameSimbad column added by the CDSmeta.idcharNEDnameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifier ("CDF-S", "E-CDF-S" or "XMM-LH")meta.id;obs.fieldcharID[1/2020] Source identifier within the Field (G1)meta.id;meta.mainintz[0.5/3.5] Best redshift estimatesrc.redshiftfloatlogLb[42.8/47.1] Log bolometric luminosity; erg/slog(1e-07W)phys.luminosityfloate_logLb[0/0.4] Uncertainty in logLblog(1e-07W)stat.errorfloatlogMBH[6.5/9.3] Log black hole masslog(solMass)phys.massfloate_logMBH[0/0.9] Uncertainty in logMBHlog(solMass)stat.errorfloatlogHa[3.3/4.2]? Log H{alpha} Full-Width at Half-Maximumlog(km.s**-1)spect.line.widthfloatnullablee_logHa? Uncertainty in Halog(km.s**-1)stat.errorfloatnullablelogHb[3.3/3.9]? Log H{beta} Full-Width at Half-Maximumlog(km.s**-1)spect.line.widthfloatnullablee_logHb? Uncertainty in Hblog(km.s**-1)stat.errorfloatnullablelogMgII[3.3/4.5]? Log Mg II Full-Width at Half-Maximumlog(km.s**-1)spect.line.widthfloatnullablee_logMgII? Uncertainty in MgIIlog(km.s**-1)stat.errorfloatnullablelogLHa[41.7/44.2]? Log H{alpha} luminosity; erg/slog(1e-07W)phys.luminosity;em.line.Halphafloatnullablee_logLHa? Uncertainty in logLHalog(1e-07W)stat.errorfloatnullablelogLHb[40.8/42.9]? Log H{beta} luminosity; erg/slog(1e-07W)phys.luminosity;em.line.Hbetafloatnullablee_logLHb? Uncertainty in logLHblog(1e-07W)stat.errorfloatnullablelogL3000[43.2/46.1]? Log luminosity at 3000{AA} in erg/slog(1e-07W)phys.luminosityfloatnullablee_logL3000? Uncertainty in logL3000log(1e-07W)stat.errorfloatnullableObsDisplay Subaru observations if anymeta.ref.urlintnullable_RAPositions from SIMBAD or from Brunner+, 2008, J/A+A/479/283 (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD or from Brunner+, 2008, J/A+A/479/283 (declination part)degpos.eq.dec;meta.main