J/MNRAS/479/807ivo://CDS.VizieR/J/MNRAS/479/807doi:10.26093/cds/vizier.74790807CDSLofthouse E.K.Kaviraj S.Smith D.J.B.Hardcastle M.J.2024-08-18T20:20:54Z2018-08-24T07:34:23ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-sourcesradio-continuum-emissionWe present a catalogue of 2210 local (z<0.1) galaxies that contain faint active galactic nuclei (AGN). We select these objects by identifying galaxies that exhibit a significant excess in their radio luminosities, compared to what is expected from the observed levels of star formation activity in these systems. This is achieved by comparing the optical (spectroscopic) star formation rate (SFR) to the 1.4GHz luminosity measured from the Faint Images of the Radio Sky at Twenty centimeters survey. The majority of the AGN identified in this study are fainter than those in previous work, such as in the Best and Heckman (2012, Cat. J/MNRAS/421/1569) catalogue. We show that these faint AGN make a non-negligible contribution to the radio luminosity function at low luminosities (below 10^22.5^W/Hz), and host ~13 per cent of the local radio luminosity budget. Their host galaxies are predominantly high stellar-mass systems (with a median stellar mass of 1011 M), are found across a range of environments (but typically in denser environments than star-forming galaxies) and have early-type morphologies. This study demonstrates a general technique to identify AGN in galaxy populations where reliable optical SFRs can be extracted using spectro-photometry and where radio data are also available so that a radio excess can be measured. Our results also demonstrate that it is unsafe to infer SFRs from radio emission alone, even if bright AGN have been excluded from a sample, since there is a significant population of faint radio AGN that may contaminate the radio-derived SFRs.2018MNRAS.479..807Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/479/807CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/479/807https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/479/807http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/479/807https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/479/807https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/479/807http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/479/807GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/479/807/catalog (Catalogue of faint local radio AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/479/807/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/479/807/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/479/807/catalog?GETtext/xml+votable180.050000true146.56561-1.084740.0055555555555555565/2131 2158 2198 6931 7063 6/4204 4210 4213-4215 4246 4249 4255-4256 4263-4264 4267 4271 4280 4294 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Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftdoubleLFIRSTFIRST LuminosityW/Hzphys.luminositydoublelogSFRFLogarithm of star formation rate derived from FIRST luminositylog(solMass.yr**-1)phys.SFRdoublelogSFRMLogarithm of star formation rate from SDSS MPA-JHU cataloguelog(solMass.yr**-1)phys.SFRdoublelogM*Logarithm of stellar masslog(solMass)phys.massdoubleBT? Bulge-to-total light ratiophot.mag.sb;arith.ratiodoublenullablelogMhalo? Logarithm of halo masslog(solMass)phys.massdoublenullableBPT[-1/5] BPT classification (1)meta.code.classint