J/A+A/567/A76ivo://CDS.VizieR/J/A+A/567/A76doi:10.26093/cds/vizier.35670076CDSBaldi R.D.Capetti A.Chiaberge M.Celotti A.2017-09-29T09:03:34Z2014-11-12T10:41:46ZCDS support team

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

cds-question@unistra.frradio-galaxiesphotometryredshiftedWe select a sample of radio galaxies at high redshifts (z>1) in the COSMOS field by cross-matching optical and infrared (IR) images with the FIRST radio data. The aim of this study is to explore the high-z radio-loud (RL) active galactic nuclei (AGN) population at much lower luminosities than the classical samples of distant radio sources, which are similar to those of the local population of radio galaxies. Precisely, we extended a previous analysis focused on low-luminosity radio galaxies. The wide multiwavelength coverage provided by the COSMOS survey allows us to derive their spectral energy distributions (SEDs). We model them with our own developed technique 2SPD that includes old and young stellar populations and dust emission. When added to those previously selected, we obtain a sample of 74 RL AGN. The SED modeling returns several important quantities associated with the AGN and host properties. The resulting photometric redshifts range from z~0.7 to 3. The sample mostly includes compact radio sources but also 21 FR IIs sources; the radio power distribution of the sample covers ~10^31.5^-10^34.3^erg/s/Hz, thus straddling the local FR I/FR II break. The inferred range of stellar mass of the hosts is ~10^10^-10^11.5^M_{sun}_. The SEDs are dominated by the contribution from an old stellar population with an age of ~1-3Gyr for most of the sources. However, UV and mid-IR (MIR) excesses are observed for half of the sample. The dust luminosities inferred from the MIR excesses are in the range, L_dust_~10^43^-10^45.5^erg/s, which are associated with temperatures approximately of 350-1200K. Estimates of the UV component yield values of ~10^41.5^-10^45.5^erg/s at 2000{AA}. The UV emission is significantly correlated with both IR and radio luminosities; the former being the stronger link. However, the origin of UV and dust emission, whether it is produced by the AGN of by star formation, is still unclear. Our results show that this RLAGN population at high redshifts displays a wide variety of properties. Low-power radio galaxies, which are associated with UV- and IR-faint hosts are generally similar to red massive galaxies of the local FR Is. At the opposite side of the radio luminosity distribution, large MIR and UV excesses are observed in objects consistent with quasar-like AGN, as also proved by their high dust temperatures, which are more similar to local FR IIs.2014A&A...567A..76Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/567/A76CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/128/1974 : The VLA-COSMOS survey (Schinnerer+, 2004)J/ApJS/172/46 : VLA-COSMOS survey. II. (Schinnerer+, 2007)J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/567/A76https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/567/A76http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/567/A76https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/567/A76https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/567/A76http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/567/A76GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/567/A76/table2 (Radio galaxies with no clear host identification)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/567/A76/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/567/A76/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/567/A76/table2?GETtext/xml+votable180.050000true150.260008332.090769440.005555555555555556Cone search capability for table J/A+A/567/A76/sample (The sample of 46 identified radio galaxies: radio fluxes, redshifts (table 1), results from 2SPD analysis (table 3), and details of fluxes (tables A1 and A2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/567/A76/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/567/A76/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/567/A76/sample?GETtext/xml+votable180.050000true150.19562.123894440.005555555555555556Cone search capability for table J/A+A/567/A76/table5 (The radio-loud AGN population in the COSMOS field at z>~1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/567/A76/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/567/A76/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/567/A76/table5?GETtext/xml+votable180.050000true0.19562.12389440.0055555555555555565/6814 6/19459 19462 27245 27247 273446.772611666688002e-21 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/567/A76?format=asciiRadioOpticaldefaultJ/A+A/567/A76/table2Radio galaxies with no clear host identificationl_imagLimit flag on imagmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/56] ID number of the object (1)meta.id;meta.mainintRadioIDCOSMOS-VLA (Large Project) ID number of the object (Schinnerer et al., 2007, J/ApJS/172/46)meta.idcharn_RadioID[*] Source from COSMOS-VLA Deep (2)meta.notecharNm? Number of components in case of multiple objectsmeta.numberintnullableRAJ2000Right ascension of (one of the components of) FIRST radio source (J2000)pos.eq.ra;meta.mainDEJ2000Declination of (one of the components of) FIRST radio source (J2000)pos.eq.dec;meta.mainNcNumber of matches found in the FIRST catalog associated with the same radio galaxymeta.numberintFFIRST(total) FIRST radio flux of the entire radio sourcemJyphot.flux.density;em.radio.750-1500MHzfloatl_FNVSSLimit flag on FNVSSmeta.code.errorcharFNVSS? NVSS radio fluxmJyphot.flux.density;em.radio.750-1500MHzfloatnullableMRadioCOSMOS-VLA radio morphology (FR I, FR II, compact or extended)meta.code;src.morphcharimag? Subaru i+, CFHT i* or ACS/HST F814W magnitude of the host galaxy from the the COSMOS catalog or measured on the imagemagphot.mag;em.opt.IfloatnullableJ/A+A/567/A76/sampleThe sample of 46 identified radio galaxies: radio fluxes, redshifts (table 1), results from 2SPD analysis (table 3), and details of fluxes (tables A1 and A2)l_FNVSSLimit flag on FNVSSmeta.code.errorcharz+magSubaru z+ magnitudemagphot.mag;em.opt.IfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRadioIDCOSMOS-VLA (Large Project) ID number of the object (Schinnerer et al., 2007, J/ApJS/172/46)meta.idcharn_RadioID[*] Source from COSMOS-VLA Deep (2)meta.notecharNm? Number of components in case of multiple objectsmeta.numberintnullableRAJ2000Right ascension of (one of the components of) FIRST radio source (J2000)pos.eq.ra;meta.mainDEJ2000Declination of (one of the components of) FIRST radio source (J2000)pos.eq.dec;meta.mainNcNumber of matches found in the FIRST catalog associated with the same radio galaxymeta.numberintFFIRST(total) FIRST radio flux of the entire radio sourcemJyphot.flux.density;em.radio.750-1500MHzfloatFNVSS? NVSS radio fluxmJyphot.flux.density;em.radio.750-1500MHzfloatnullablen_FNVSS[*] objects #12 and 13 are included in the same NVSS radio source with a flux of 7.6mJymeta.notecharMRadioCOSMOS-VLA radio morphology (FR I, FR II, compact or extended)meta.code;src.morphcharHostID? ID number of the host associated with the radio galaxy from the COSMOS Intermediate and Broad Band Photometry Catalog 2008meta.id.parentintnullablel_imagLimit flag on imagmeta.code.errorcharimag? Subaru i+, CFHT i* or ACS/HST F814W magnitude of the host galaxy from the the COSMOS catalog or measured on the imagemagphot.mag;em.opt.Ifloatnullablezph? Photometric redshift with 99% confidence-level errorssrc.redshiftfloatnullablezsp? Spectroscopic redshiftsrc.redshiftdoublenullabler_zspReference for zsp (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlcharSeq[1/46] ID number of the objectmeta.id;meta.mainintn_Seq[*] * for objects excluded from the final sample for their ambiguous SED propertiesmeta.notecharzPhotometric redshift measured with 2SPDsrc.redshiftfloatn_z[s] s when spectroscopic redshiftmeta.notecharAgeYSP[0.001/0.04]? Age of the young stellar population (YSP) at 4800{AA} rest frameGyrtime.agefloatnullableAVYSP? Absorption of the young stellar population (YSP) at 4800{AA} rest framemagphys.absorption.galfloatnullablefYSP[0/99]? Flux fraction of the young stellar population (YSP) at 4800{AA} rest frame%phot.flux;arith.ratiofloatnullablefM*YSP? Mass fraction of the young stellar population (YSP) at 4800{AA} rest frame%phys.mass;arith.ratiofloatnullableQSO[QSO] QSO for spectroscopically-confirmed quasarmeta.notecharAgeOSP? Age of the old stellar population (OSP)Gyrtime.agefloatnullableAVOSP? Absorption of the old stellar population (OSP)phys.absorption.galfloatnullablelogM*? Total stellar mass of the galaxylog(solMass)phys.massfloatnullableTdust? Effective dust temperature of the first componentKphys.temperature.effectiveintnullableTdust2? Effective dust temperature of the second componentKphys.temperature.effectiveintnullableLdust? Dust luminosity of the first componentGsolLumphys.luminosityfloatnullableLdust2? Dust luminosity of the second componentGsolLumphys.luminosityfloatnullablel_LIRexLimit flag on LIRexmeta.code.errorcharLIRex? Infrared excess luminosity defined in the text (Sect. 6.3)log(1e-07W)phys.luminosity;em.IRfloatnullablel_a8-24Limit flag on a8-24meta.code.errorchara8-24? Spectral index {alpha} measured on the infrared excess at 8 and 24umspect.indexfloatnullablel_LUVLimit flag on LUVmeta.code.errorcharLUV? UV luminosity at 2000{AA} in the rest framelog(1e-07W)phys.luminosity;em.UVfloatnullablen_LUV[m] m indicates marginal UV excessmeta.notecharl_u*magLimit flag on u*magmeta.code.errorcharu*magCFHT u* magnitudemagphot.mag;em.opt.Ufloate_u*mag? rms uncertainty on u*magmagstat.error;phot.mag;em.opt.Ufloatnullablen_u*mag[*] our 3"-aperture photometry measuremeta.notecharl_BJmagLimit flag on Bjmagmeta.code.errorcharBJmagSubaru Bj magnitudemagphot.mag;em.opt.Bfloate_BJmag? rms uncertainty on Bjmagmagstat.error;phot.magfloatnullablen_BJmag[*] our 3"-aperture photometry measuremeta.notecharl_g+magLimit flag on g+magmeta.code.errorcharg+magSubaru g+ magnitudemagphot.mag;em.opt.Rfloate_g+mag? rms uncertainty on g+magmagstat.error;phot.mag;em.opt.Bfloatnullablen_g+mag[*] our 3"-aperture photometry measuremeta.notecharl_VJmagLimit flag on VJmagmeta.code.errorcharVJmagSubaru VJ magnitudemagphot.mag;em.opt.Vfloate_VJmag? rms uncertainty on VJmagmagstat.error;phot.magfloatnullablen_VJmag[*] our 3"-aperture photometry measuremeta.notecharl_r+magLimit flag on r+magmeta.code.errorcharr+magSubaru r+ magnitudemagphot.mag;em.opt.Rfloate_r+mag? rms uncertainty on r+magmagstat.error;phot.mag;em.opt.Rfloatnullablen_r+mag[*] our 3"-aperture photometry measuremeta.notecharl_i*magLimit flag on i*magmeta.code.errorchari*magCFHT i* magnitudemagphot.mag;em.opt.Ifloate_i*mag? rms uncertainty on i*magmagstat.error;phot.magfloatnullablen_i*mag[*] our 3"-aperture photometry measuremeta.notecharl_i+magLimit flag on i+magmeta.code.errorchari+mag? Subaru i+ magnitudemagphot.mag;em.opt.Ifloatnullablee_i+mag? rms uncertainty on i+magmagstat.error;phot.mag;em.opt.Ifloatnullablen_i+mag[*] our 3"-aperture photometry measuremeta.notecharl_F814WLimit flag on F814Wmagmeta.code.errorcharF814W? HST/ACS F814W magnitudemagphot.mag;em.opt.Ifloatnullablee_F814W? rms uncertainty on F814Wmagstat.errorfloatnullablen_F814W[*] our 3"-aperture photometry measuremeta.notecharl_z+magLimit flag on z+magmeta.code.errorchare_z+mag? rms uncertainty on z+magmagstat.error;phot.mag;em.opt.Ifloatnullablen_z+mag[*] our 3"-aperture photometry measuremeta.notecharl_JmagLimit flag on Jmagmeta.code.errorcharJmagUKIRT J magnitudemagphot.mag;em.IR.Jfloate_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablen_Jmag[*] our 3"-aperture photometry measuremeta.notecharl_KmagLimit flag on Kmagmeta.code.errorcharKmag? CFHT K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullablen_Kmag[*] our 3"-aperture photometry measuremeta.notecharl_KsmagLimit flag on Kmagmeta.code.errorcharKsmag? NOAO Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullablen_Ksmag[*] our 3"-aperture photometry measuremeta.notecharFUV? GALEX FUV magnitudemagphot.mag;em.UV.100-200nmfloatnullablee_FUV? rms uncertainty on FUVmagstat.errorfloatnullableNUV? GALEX NUV magnitudemagphot.mag;em.UVfloatnullablee_NUV? rms uncertainty on NUVmagstat.errorfloatnullablen_NUV[*] our 3"-aperture photometry measuremeta.notecharIRAC1Spitzer/IRAC 3.6um fluxmJyphot.mag;em.IR.3-4umfloate_IRAC1rms uncertainty on IRAC1mJystat.errorfloatn_IRAC1[*] our 3"-aperture photometry measuremeta.notecharIRAC2Spitzer/IRAC 4.5um fluxmJyphot.mag;em.IR.4-8umfloate_IRAC2rms uncertainty on IRAC2mJystat.errorfloatn_IRAC2[*] our 3"-aperture photometry measuremeta.notecharl_IRAC3Limit flag on IRAC3meta.code.errorcharIRAC3? Spitzer/IRAC 5.8um fluxmJyphot.flux.density;em.IR.4-8umfloatnullablee_IRAC3? rms uncertainty on IRAC3mJystat.errorfloatnullablen_IRAC3[*] our 3"-aperture photometry measuremeta.notecharIRAC4? Spitzer/IRAC 8.0um fluxmJyphot.flux.density;em.IR.8-15umfloatnullablee_IRAC4? rms uncertainty on IRAC4mJystat.errorfloatnullablen_IRAC4[*] our 3"-aperture photometry measuremeta.notecharl_MIPSLimit flag on MIPSmeta.code.errorcharMIPS? Spitzer/MIPS 24um fluxmJyphot.flux.density;em.IR.15-30umfloatnullablee_MIPS? rms uncertainty in MIPSmJystat.errorfloatnullablen_MIPS[*] our 3"-aperture photometry measuremeta.notecharJ/A+A/567/A76/table5The radio-loud AGN population in the COSMOS field at z>~1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/46]? ID number of the objectmeta.id;meta.mainintnullableID1[1/285]? COSMOS-FR I name (Chiaberge et al. 2009ApJ...696.1103C <[CTC2009] NNN> in Simbad)meta.idintnullablezPhotometric or spectroscopic redshiftsrc.redshiftfloatn_z[s] s for spectroscopic redshiftmeta.notecharLFIRSTFIRST radio luminosityphys.luminosity;em.radiofloatl_LNVSSLimit flag on LNVSSmeta.code.errorcharLNVSS? NVSS radio luminosityphys.luminosity;em.radiofloatnullableRClRadio class (LP or HP for low or high power)src.classcharRMorphRadio morphology based on the VLA-COSMOS images (FR I, FR II, compact or extended)meta.code;src.morphcharQSO[QSO] "QSO" for spectroscopically-confirmed and photometrically-defined quasarmeta.notecharlogM*? Total stellar mass of the galaxylog(solMass)phys.massfloatnullablel_LIRexLimit flag on LIRexmeta.code.errorcharLIRex? Infrared excess luminosity defined in the text (Sect. 6.3)log(1e-07W)phys.luminosity;em.IRfloatnullablel_a8-24Limit flag on a8-24meta.code.errorchara8-24? Spectral index measured on the infrared excess at 8 and 24umspect.indexfloatnullablel_LUVLimit flag on LUVmeta.code.errorcharLUV? UV luminosity at 2000{AA} in the rest framelog(1e-07W)phys.luminosity;em.UVfloatnullablen_LUV[m] m indicates marginal UV excessmeta.notechar_RAPosition of the sources, from table1 for the sample radio galaxies, and from Baldi et al. 2013ApJ...762...30B for COSMOS-FR I galaxies (right ascension part)degpos.eq.ra;meta.main_DEPosition of the sources, from table1 for the sample radio galaxies, and from Baldi et al. 2013ApJ...762...30B for COSMOS-FR I galaxies (declination part)degpos.eq.dec;meta.main