J/ApJ/819/62ivo://CDS.VizieR/J/ApJ/819/62doi:10.26093/cds/vizier.18190062CDSCivano F.Marchesi S.Comastri A.Urry M.C.Elvis M.Cappelluti N.,Puccetti S.Brusa M.Zamorani G.Hasinger G.Aldcroft T.,Alexander D.M.Allevato V.Brunner H.Capak P.Finoguenov A.Fiore F.,Fruscione A.Gilli R.Glotfelty K.Griffiths R.E.Hao H.,Harrison F.A.Jahnke K.Kartaltepe J.Karim A.Lamassa S.M.,Lanzuisi G.Miyaji T.Ranalli P.Salvato M.Sargent M.Scoville N.J.,Schawinski K.Schinnerer E.Silverman J.Smolcic V.Stern D.Toft S.,Trakhenbrot B.Treister E.Vignali C.2023-06-08T08:22:27Z2016-06-17T14:52:51ZCDS support team

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

cds-question@unistra.frx-ray-sourcessurveysThe COSMOS-Legacy survey is a 4.6Ms Chandra program that has imaged 2.2deg^2^ of the COSMOS field with an effective exposure of ~160ks over the central 1.5deg^2^ and of ~80ks in the remaining area. The survey is the combination of 56 new observations obtained as an X-ray Visionary Project with the previous C-COSMOS survey. We describe the reduction and analysis of the new observations and the properties of 2273 point sources detected above a spurious probability of 2x10^-5^. We also present the updated properties of the C-COSMOS sources detected in the new data. The whole survey includes 4016 point sources (3814, 2920 and 2440 in the full, soft, and hard band). The limiting depths are 2.2x10^-16^, 1.5x10^-15^, and 8.9x10^-16^erg/cm^2^/s in the 0.5-2, 2-10, and 0.5-10keV bands, respectively. The observed fraction of obscured active galactic nuclei with a column density >10^22^/cm^2^ from the hardness ratio (HR) is ~50^+17^_-16_%. Given the large sample we compute source number counts in the hard and soft bands, significantly reducing the uncertainties of 5%-10%. For the first time we compute number counts for obscured (HR>-0.2) and unobscured (HR<-0.2) sources and find significant differences between the two populations in the soft band. Due to the unprecedent large exposure, COSMOS-Legacy area is three times larger than surveys at similar depths and its depth is three times fainter than surveys covering similar areas. The area-flux region occupied by COSMOS-Legacy is likely to remain unsurpassed for years to come.2016ApJ...819...62Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/819/62CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)J/ApJ/817/172 : X-ray Observations of Stripe 82 (LaMassa+, 2016)J/ApJS/220/10 : AEGIS-X Deep survey of EGS (AEGIS-XD) (Nandra+, 2015)J/ApJ/808/185 : NuSTAR surveys: COSMOS catalog (Civano+, 2015)J/A+A/577/A121 : The XMM-ATLAS catalogues (Ranalli+, 2015)J/MNRAS/446/911 : X-ray sources in the AKARI NEP deep field (Krumpe+, 2015)J/MNRAS/443/2590 : The VLA-COSMOS Survey. V. 324MHz (Smolcic+, 2014)J/MNRAS/436/3581 : X-ray observations of Stripe 82 (LaMassa+, 2013)J/ApJS/202/6 : XDEEP2 survey catalog (Goulding+, 2012)J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)J/A+A/535/A80 : Type-2 QSOs in XMM-COSMOS (Mainieri+, 2011)J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)J/ApJS/185/433 : SWIRE/Chandra survey in Lockman Hole Field (Wilkes+, 2009)J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)J/A+A/497/635 : XMM-Newton wide-field survey in COSMOS (Cappelluti+, 2009)J/ApJS/179/19 : CDFS survey: 2 Ms source catalogs (Luo+, 2008)J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+ 2007)J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)J/AJ/128/1974 : The VLA-COSMOS survey (Schinnerer+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/819/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/819/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/819/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/819/62https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/819/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/819/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/819/62/table5 (COSMOS-Legacy Survey point source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/819/62/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/819/62/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/819/62/table5?GETtext/xml+votable180.050000true149.639561.991033890.005555555555555556Cone search capability for table J/ApJ/819/62/table1 (COSMOS-Legacy Survey (CLS) observation summary)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/819/62/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/819/62/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/819/62/table1?GETtext/xml+votable180.050000true150.544451112.4990450.0055555555555555565/6814 6/27245 27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/819/62?format=asciiX-raydefaultJ/ApJ/819/62/table5COSMOS-Legacy Survey point source catalogSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDChandra source name (1)meta.id;meta.maincharRAJ2000Chandra Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Chandra Declination (J2000)degpos.eq.dec;meta.mainPosErr[0.1/7] X-ray positional errorarcsecstat.error;posfloatDet0.5-7[-99/30115.7]? Maximum likelihood detection value in 0.5-7keV bandstat.likelihoodfloatnullableCR0.5-7[0/0.06] 0.5-7keV count ratect/sphot.count;em.X-raydoublee_CR0.5-7[-99/0.002]? CR0.5-7 uncertaintyct/sstat.errordoublenullableF0.5-100.5-10keV flux in erg/s/cm2mW.m**-2phot.flux;em.X-raydoublee_F0.5-10[-99/]? F0.5-10 uncertaintymW.m**-2stat.errordoublenullableSN0.5-7[0/78] 0.5-7keV signal-to-noise ratiostat.snrfloatExp0.5-7[10/268]? 0.5-7keV exposure timekstime.duration;obs.exposure;em.X-ray.mediumfloatnullableCts0.5-7[3/5440]? 0.5-7keV aperture photometry countsctphot.count;em.X-rayfloatnullablee_Cts0.5-7[2/95]? Cts0.5-7 uncertaintyctstat.errorfloatnullableDet0.5-2[-99/24570.8]? Maximum likelihood detection value in 0.5-2keV bandstat.likelihoodfloatnullableCR0.5-2[0/0.05] 0.5-2 keV count ratect/sphot.count;em.X-raydoublee_CR0.5-2[-99/0.002]? CR0.5-2 uncertaintyct/sstat.errordoublenullableF0.5-20.5-2keV flux in erg/s/cm2mW.m**-2phot.flux;em.X-raydoublee_F0.5-2[-99/]? F0.5-2 uncertaintymW.m**-2stat.errordoublenullableSN0.5-2[0/67] 0.5-2keV signal-to-noise ratiostat.snrfloatExp0.5-2[13/243]? 0.5-2keV exposure timekstime.duration;obs.exposure;em.X-ray.softfloatnullableCts0.5-2[1/3918]? 0.5-2keV aperture photometry countsctphot.count;em.X-rayfloatnullablee_Cts0.5-2[2/81]? Cts0.5-2 uncertaintyctstat.errorfloatnullableDet2-7[-99/7830]? Maximum likelihood detection value in 2-7keV bandstat.likelihoodfloatnullableCR2-7[0/0.02] 2-7keV count ratect/sphot.count;em.X-raydoublee_CR2-7[-99/0.0005]? CR2-7 uncertaintyct/sstat.errordoublenullableF2-102-10keV flux in erg/s/cm2mW.m**-2phot.flux;em.X-raydoublee_F2-10[-99/]? F2-10 uncertaintymW.m**-2stat.errordoublenullableSN2-7[0.7/41]? 2-7keV signal-to-noise ratiostat.snrfloatnullableExp2-7[21/289]? 2-7keV exposure timekstime.duration;obs.exposure;em.X-ray.mediumfloatnullableCts2-7[2/1867]? 2-7keV aperture photometry countsctphot.count;em.X-rayfloatnullablee_Cts2-7[2/56]? Cts2-7 uncertaintyctstat.errorfloatnullableHR[-0.95/0.92]? Hardness Ratio, (H-S)/(H+S)phot.flux;arith.ratiofloatnullableb_HR[-1/1]? Hardness Ratio 90% lower limitphot.flux;stat.minfloatnullableB_HR[-1/1]? Hardness Ratio 90% upper limitphot.flux;stat.maxfloatnullableCCOSMOSDisplay the Chandra COSMOS survey data (Elvis+, 2009, J/ApJS/184/158) for this sourcemeta.ref.urlcharJ/ApJ/819/62/table1COSMOS-Legacy Survey (CLS) observation summaryDateObservation datetime.epoch;obsnullableExp[5439/53051] Exposure timestime.duration;obs.exposureintRoll[48/268] Roll angledeginstr.offsetfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifier (CLS_NN; numbers 1-56)meta.id;obs.fieldcharObsID[15207/16562] Chandra observation IDmeta.id;obsintRAJ2000Chandra right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Chandra declination (J2000)degpos.eq.dec;meta.main