J/ApJ/790/16ivo://CDS.VizieR/J/ApJ/790/16doi:10.26093/cds/vizier.17900016CDSCivano F.Fabbiano G.Pellegrini S.Kim D.-W.Paggi A.Feder R.,Elvis M.2017-09-12T13:16:26Z2017-03-23T15:57:59ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsx-ray-sourcesredshiftedWe study a sample of 69 X-ray detected early-type galaxies (ETGs), selected from the Chandra COSMOS survey, to explore the relation between the X-ray luminosity of hot gaseous halos (L_X, gas_) and the integrated stellar luminosity (L_K_) of the galaxies, in a range of redshift extending out to z = 1.5. In the local universe, a tight, steep relationship has been established between these two quantities (L_x.gas_ ~ L_K_^4.5^), suggesting the presence of largely virialized halos in X-ray luminous systems. We use well-established relations from the study of local universe ETGs, together with the expected evolution of the X-ray emission, to subtract the contribution of low-mass X-ray binary populations from the X-ray luminosity of our sample. Our selection minimizes the presence of active galactic nuclei (AGNs), yielding a sample representative of normal passive COSMOS ETGs; therefore, the resulting luminosity should be representative of gaseous halos, although we cannot exclude other sources such as obscured AGNs or enhanced X-ray emission connected with embedded star formation in the higher-z galaxies. We find that most of the galaxies with estimated L_X_< 10^42^ erg/s and z < 0.55 follow the L_X, gas_-L_K_ relation of local universe ETGs. For these galaxies, the gravitational mass can be estimated with a certain degree of confidence from the local virial relation. However, the more luminous (10^42^ erg/s <L_X_< 10^43.5^ erg/s) and distant galaxies present significantly larger scatter; these galaxies also tend to have younger stellar ages. The divergence from the local L_X, gas_-L_K_relation in these galaxies implies significantly enhanced X-ray emission up to a factor of 100 larger than predicted from the local relation. We discuss the implications of this result for the presence of hidden AGNs, and the evolution of hot halos, in nuclear and star formation feedback.2014ApJ...790...16Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/790/16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/328/461 : X-ray luminosities of early-type galaxies (O'Sullivan+, 2001)J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)J/A+A/510/A56 : zCOSMOS type-2 AGN (Bongiorno, 2010)J/ApJ/725/480 : Stellar X-ray sources in the COSMOS survey (Wright+, 2010)J/ApJ/742/61 : Photometric redshift of AGNs from XMM- and C-COSMOSJ/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)J/MNRAS/422/494 : X-ray properties of optically selected ETGsJ/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/790/16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/790/16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/790/16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/790/16https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/790/16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/790/16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/790/16/table1 (COSMOS X-Ray ETGs Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/790/16/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/790/16/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/790/16/table1?GETtext/xml+votable180.050000true150.230022.39557890.0055555555555555565/6814 6/27247https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/790/16?format=asciiX-rayOpticaldefaultJ/ApJ/790/16/table1COSMOS X-Ray ETGs PropertieszRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCIDChandra identifier according to Elvis et al. (2009, Cat. J/ApJS/184/158) [ECV2009] NNNNN in Simbadmeta.id;meta.mainintn_z[d] Note on z (1)meta.notecharMTypeSpectral type (2)src.spTypecharCRCount rates in the 0.5-7 keV bandct/sphot.count;em.X-raydoublee_CRError in count ratesct/sstat.errordoublelogL(X-lmxb)Log of the X-ray luminosity in the 0.3-8 keV band (3)log(1e-07W)phys.luminosity;em.X-rayfloatlogL(X)Log of the remaining X-ray luminosity in the 0.3-8 keV band (4)log(1e-07W)phys.luminosity;em.X-rayfloatl_HRLimit flag on HRmeta.code.errorcharHRHardness ratio (5)phot.flux;arith.ratiofloatExt[0/10] Extension of X-ray emissionem.energyintlogL(K)Log of K band luminositylog(solLum)phys.luminosity;em.IR.Kfloate_logL(K)Error in logL(K)log(solLum)stat.errorfloatlogM*Log of stellar masslog(solMass)phys.massfloatAgeAge of early type galaxyGyrmeta.note;time.agefloatGroup[1]? Group relevancemeta.idintnullableRadio[1]? Radio emission flagmeta.codeintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Elvis et al. (2009, Cat. J/ApJS/184/158) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Elvis et al. (2009, Cat. J/ApJS/184/158) (declination part)degpos.eq.dec;meta.main