J/ApJ/693/8ivo://CDS.VizieR/J/ApJ/693/8doi:10.26093/cds/vizier.16930008CDSBrusa M.Comastri A.Gilli R.Hasinger G.Iwasawa K.Mainieri V.,Mignoli M.Salvato M.Zamorani G.Bongiorno A.Cappelluti N.,Civano F.Fiore F.Merloni A.Silverman J.Trump J.Vignali C.,Capak P.Elvis M.Ilbert O.Impey C.Lilly S.2017-10-12T13:00:53Z2011-03-21T15:09:49ZCDS support team

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

cds-question@unistra.frquasarsastronomical-object-identificationsurveysredshiftedx-ray-sourcesWe present a new measurement of the space density of high-redshift (z~3.0-4.5), X-ray-selected quasi-stellar objects (QSOs) obtained by exploiting the deep and uniform multiwavelength coverage of the COSMOS survey. We have assembled a large (40 objects), homogeneous sample of z>3 QSOs with X-ray flux F0.5-2keV>10^-15^erg/cm^2^/s, and available spectroscopic (22) or photometric (18) redshifts. We discuss their optical (color-color diagrams) and X-ray properties, their number counts and space densities and compare our findings with previous works and model predictions.2009ApJ...693....8Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/693/8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)J/A+A/497/635 : XMM-Newton wide-field survey in COSMOS field (Cappelluti+,J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+, 2007)J/ApJ/644/100 : SDSS quasars in the COSMOS field (Prescott+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/693/8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/693/8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/693/8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/693/8https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/693/8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/693/8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/693/8/table1 (Coordinates and properties of the z>3 QSOs from the XMM-COSMOS sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/693/8/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/693/8/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/693/8/table1?GETtext/xml+votable180.050000true150.25629172.64685560.0055555555555555565/6814 6/27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/693/8?format=asciiX-rayOpticaldefaultJ/ApJ/693/8/table1Coordinates and properties of the z>3 QSOs from the XMM-COSMOS sampleHRHardness ratiophot.flux;arith.ratiofloatl_HRLimit flag on HRmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BCG2009]Name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharXMMCX-ray number from the XMM-COSMOS (1)meta.id.crossintCOSMOSOptical identifier number (2)meta.id.crossintzsp? Spectroscopic redshiftsrc.redshiftfloatnullablef_zspNote on the redshift (3)meta.codecharzphPhotometric redshiftsrc.redshift.photfloatf_zph[efi, ] Note on zph (3)meta.codecharzphLLower limit of zphsrc.redshift.photfloatzphUUpper limit of zphsrc.redshift.photfloatimagACOSMOS total AB i-band magnitude (2)magphot.mag;em.opt.IfloatFlx0.5-2kev X-ray flux (in 10^-15^cgs unit)aW.m**-2meta.unit;phot.flux;em.X-ray.softfloatf_Flx[l] Marginal detection (3)meta.codecharlogLLog of rest-frame 2-10kev (hard) X-ray luminosity (in cgs unit)log(1e-07W)phys.luminosity;em.X-rayfloatSloanDisplay the SDSS data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDScharRAJ2000Optical hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Optical degree of declination (J2000)pos.eq.dec;meta.main