J/ApJ/903/139ivo://CDS.VizieR/J/ApJ/903/139doi:10.26093/cds/vizier.19030139CDSAlgera H.S.B.van der Vlugt D.Hodge J.A.Smail I.R.Novak M.,Radcliffe J.F.Riechers D.A.Rottgering H.Smolcic V.Walter F.2023-09-05T07:21:44Z2022-02-25T06:53:38ZCDS support team

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

cds-question@unistra.frsurveysactive-galactic-nucleiradio-sourcesUltra-deep radio surveys are an invaluable probe of dust-obscured star formation, but require a clear understanding of the relative contribution from radio active galactic nuclei (AGNs) to be used to their fullest potential. We study the composition of the {mu}Jy radio population detected in the Karl G. Jansky Very Large Array COSMOS-XS survey based on a sample of 1540 sources detected at 3GHz over an area of ~350arcmin^2^. This ultra-deep survey consists of a single pointing in the well-studied COSMOS field at both 3 and 10GHz and reaches rms sensitivities of 0.53 and 0.41{mu}Jy/beam, respectively. We find multiwavelength counterparts for 97% of radio sources, based on a combination of near-UV/optical to sub-millimeter data, and through a stacking analysis at optical/near-IR wavelengths we further show that the sources lacking such counterparts are likely to be high-redshift in nature (typical z~4-5). Utilizing the multiwavelength data over COSMOS, we identify AGNs through a variety of diagnostics and find these to make up 23.2~1.3% of our sample, with the remainder constituting uncontaminated star-forming galaxies. However, more than half of the AGNs exhibit radio emission consistent with originating from star formation, with only 8.8~0.8% of radio sources showing a clear excess in radio luminosity. At flux densities of ~30{mu}Jy at 3GHz, the fraction of star formation-powered sources reaches ~90%, and this fraction is consistent with unity at even lower flux densities. Overall, our findings imply that ultra-deep radio surveys such as COSMOS-XS constitute a highly effective means of obtaining clean samples of star formation-powered radio sources.2020ApJ...903..139Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/903/139CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)VIII/103 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)J/ApJ/554/803 : New VLA Sky Survey Cat of IRAS 2 Jy Galaxies (Yun+ 2001)J/ApJ/586/794 : Multiwavelength luminosities of galaxies (Bell, 2003)J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)J/ApJS/172/46 : VLA-COSMOS survey. II. (Schinnerer+, 2007)J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)J/ApJ/690/20 : Models of the AGN and black hole populations (Shankar+, 2009)J/ApJ/699/L43 : FIRST-NVSS-SDSS AGN sample catalog (Smolcic+, 2009)J/ApJS/188/384 : The VLA-COSMOS survey. IV. (Schinnerer+, 2010)J/MNRAS/415/3831 : AzTEC/ASTE source catalogue (Aretxaga+, 2011)J/A+A/534/A110 : Type-2 AGN from XMM-COSMOS bolometric output (Lusso+, 2011)J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)J/ApJ/742/61 : Photometric redshift AGNs from XMM & C-COSMOS (Salvato+ 2011)J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)J/ApJ/761/97 : Star Formation in Radio Survey: 33GHz obs. (Murphy+, 2012)J/A+A/551/A100 : Panchromatic SED of Herschel sources (Berta+, 2013)J/MNRAS/436/3759 : ECDFS sources optical/IR counterparts (Bonzini+, 2013)J/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013)J/ApJ/788/125 : ALMA survey of ECDFS submillimeter galaxies (Simpson+, 2014)J/MNRAS/442/577 : Selected ALESS submm galaxies radio prop. (Thomson+, 2014)J/ApJ/803/34 : z~4-10 galaxies from HST legacy fields (Bouwens+, 2015)J/ApJ/806/110 : ALESS survey: SMGs in the ECDF-S data (da Cunha+, 2015)J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/ApJ/817/34 : C-COSMOS Legacy sources multiwavelength cat. (Marchesi+, 2016)J/MNRAS/465/1789 : SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)J/A+A/607/A132 : VLBA observations of the COSMOS field (Herrera Ruiz+, 2017)J/A+A/602/A2 : VLA-COSMOS 3 GHz Large Project. II. (Smolcic+, 2017)J/A+A/602/A1 : VLA-COSMOS 3 GHz Large Project (Smolcic+, 2017)J/ApJ/856/67 : VLA 3GHz radio source catalog in Lockman Hole (Cotton+, 2018)J/ApJ/853/172 : "Super-deblended" dust emission in galaxies. I. (Liu+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/903/139https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/903/139http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/903/139https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/903/139https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/903/139http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/903/139GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/903/139/tabled1 (COSMOS-XS Multi-wavelength and AGN catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/903/139/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/903/139/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/903/139/tabled1?GETtext/xml+votable180.050000true150.11792672.68422219999999930.0055555555555555566/27258-272599.276497240453405e-25 6.62606957030801e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/903/139?format=asciiRadiodefaultJ/ApJ/903/139/tabled1COSMOS-XS Multi-wavelength and AGN catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (1)meta.id;meta.maincharRAJ2000[149/151] Right Ascension (J2000) (2)degpos.eq.ra;meta.mainDEJ2000[2.37/2.73] Declination (J2000) (2)degpos.eq.dec;meta.mainz[0.001/5.31] Optimal radio source redshiftsrc.redshiftfloatf_zBoolean flag on z (3)meta.codecharF1.4[27/82740]? 1.4 GHz flux densityuJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_F1.4[8/61]? Uncertainty in F1.4uJystat.errorfloatnullableF3[2.6/27443.1] The 3 GHz flux densityuJyphot.flux.density;em.radio.1500-3000MHzfloate_F3[0.5/35]? Uncertainty in F3uJystat.errorfloatnullableF10[2.1/110]? The 10 GHz flux densityuJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F10[0.4/3.4]? Uncertainty in F10uJystat.errorfloatnullableSD? Super-Deblended catalog identifiermeta.id;meta.datasetdoublenullableC15[709682/939857]? COSMOS2015 catalog identifier (5)meta.id;meta.datasetdoublenullableSimbadSimbad column added by the CDSmeta.ref.urlchari07[1226540/1682121]? The i-band selected catalog identifier (5)meta.notedoublenullableSpurPotentially spurious flag (4)meta.codecharL1.4[1.2e+17/1.9e+26] Rest-frame 1.4GHz luminosityW/Hzphys.luminosity;em.radio.750-1500MHzdoublee_L1.4[2.4e+16/6.8e+25] The 16th percentile uncertainty in L1.4W/Hzstat.errordoubleE_L1.4[2.3e+16/9.9e+25] The 84th percentile uncertainty in L1.4W/Hzstat.error;stat.maxdoubleqTIR[-3.58/4.93] Radio-FIR correlation parameter eq1stat.fit.paramdoublee_qTIR[0.0001/0.97] 16th percentile uncertainty qTIRstat.errordoubleE_qTIR[0.0001/0.83] 84th percentile uncertainty qTIRstat.error;stat.maxdoubleXrayAGN from X-ray flagmeta.codecharIRACAGN from mid-IR colors flag (5)meta.codecharSEDAGN from SED fitting flagmeta.codecharTorusSED-AGN from MIR torus component flagmeta.codecharDiskSED-AGN from UV/opt accretion disk componentmeta.codecharrfoptAGN from red rest-frame near-UV & opt colorsmeta.codecharqeAGN from radio emission excess (6)meta.codechariqeAGN from radio emission excess (7)meta.codecharHLAGNHLAGN flag (8)meta.codecharMLAGNMLAGN flag (9)meta.codecharagn-exRadio-excess AGN flag (10)meta.codecharagn-noexAGN without radio excess (11)meta.codechar