J/AJ/123/2402ivo://CDS.VizieR/J/AJ/123/2402doi:10.26093/cds/vizier.51232402CDSFomalont E.B.Kellermann K.I.Partridge R.B.Windhorst R.A.,Richards E.A.2023-04-06T16:50:47Z2003-04-27T20:36:57ZCDS support team

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

cds-question@unistra.frradio-galaxiesWe present the results from two deep radio integrations at 8.4 GHz using the Very Large Array. One of the fields, at 13h, +43{deg} (SA 13 field), has an rms noise level of 1.49{mu}Jy and is the deepest radio image yet made. Thirty-four sources in a complete sample were detected above 7.5{mu}Jy, and 25 are optically identified to a limit of I=25.8, using our deep Hubble Space Telescope and ground-based images. The radio sources are usually located within 0.5" (typically 5kpc) of a galaxy nucleus and generally have a diameter less than 2.5". We have also analyzed a complete flux density-limited sample at 8.4GHz of 89 sources from five deep radio surveys, including the Hubble deep and flanking fields, as well as the two new fields. Half of all the optical counterparts are with galaxies brighter than I=23mag, but 20% are fainter than I=25.5mag. There may be a small tendency for the microJansky radio sources to prefer multigalaxy systems. The distribution of the radio spectral index between 1.4 and 8.4GHz peaks at {alpha}~-0.75 (S~{nu}^+{alpha}^) with a median value of -0.6. The average spectral index becomes steeper (lower values) for sources below 35{mu}Jy and for sources identified with optical counterparts fainter than I=25.5mag. This correlation suggests that there is an increasing contribution from starburst galaxies compared to AGNs at lower radio flux densities and fainter optical counterparts. The differential radio count between 7.5 and 1000{mu}Jy has a slope of -2.11+/-0.13 and a surface density of 0.64 sources (arcmin)^-2^ with a flux density greater than 7.5{mu}Jy.2002AJ....123.2402Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/123/2402CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/123/2402https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/123/2402http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/123/2402https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/123/2402https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/123/2402http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/123/2402GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/123/2402/table1 (SA13 source list and identifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2402/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2402/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2402/table1?GETtext/xml+votable180.050000true197.9895791742.652822220.005555555555555556Cone search capability for table J/AJ/123/2402/table2 (Hercules source list and identifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2402/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2402/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2402/table2?GETtext/xml+votable180.050000true258.454487550.269580560.005555555555555556Cone search capability for table J/AJ/123/2402/table4 (Catalog of micro-Jansky sources at 8.4GHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2402/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2402/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2402/table4?GETtext/xml+votable180.050000true48.8230280.355430.0055555555555555566/4033 4036 6517 10051 10843 11227 11252https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/123/2402?format=asciiRadiodefaultJ/AJ/123/2402/table1SA13 source list and identificationsl_VmagLimit flag on Vmagmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceNew source identification (G1) (1)meta.idchar[WFK95]? Old identification number from Paper I, Windhorst et al., 1995Natur.375..471Wmeta.idintnullablef_[FKP2002][*] Indicates not in the complete samplemeta.code.errorchar[FKP2002]Source name (G1)meta.id;meta.maincharS8.4GHzTotal sky flux density at 8.4GHz (2)uJyphot.flux.density;em.radio.6-12GHzfloate_S8.4GHzError in S8.4GHz (2)uJystat.errorfloatSNRSignal-to-noise on the 6" resolution imagestat.snrfloatl_SizeLimit flag on Sizemeta.code.errorcharSizeDeconvolved source angular sizearcsecphys.angSize;srcfloatRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAsThe RMS error on RAssstat.errorfloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEsThe RMS error in DEsarcsecstat.errorfloatIDTypeOptical identification type (G2)src.classcharl_BmagLimit flag on Bmagmeta.code.errorcharBmag? The B band magnitudemagphot.mag;em.opt.BfloatnullableVmag? The V band magnitudemagphot.mag;em.opt.Vfloatnullablel_ImagLimit flag on Imagmeta.code.errorcharImagThe I band magnitudemagphot.mag;em.opt.IfloatJ/AJ/123/2402/table2Hercules source list and identificationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSource? New source identification (G1)meta.idintnullable[FKP2002]Source name (G1)meta.id;meta.maincharf_[FKP2002][*] Indicates not in the complete samplemeta.code.errorcharS8.4GHzTotal sky flux density at 8.4GHz (1)uJyphot.flux.density;em.radio.6-12GHzinte_S8.4GHzError in S8.4GHz (1)uJystat.errorintSNRSignal-to-noise on the 6" resolution imagestat.snrfloatl_SizeLimit flag on Sizemeta.code.errorcharSizeDeconvolved source angular sizearcsecphys.angSize;srcfloatRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAsThe RMS error on RAssstat.errorfloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEsThe RMS error in DEsarcsecstat.errorfloatComOptical information (G2)meta.notecharJ/AJ/123/2402/table4Catalog of micro-Jansky sources at 8.4GHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FKP2002]Source name (G1)meta.id;meta.maincharn_[FKP2002][*] Indicates source is resolved, >2.5''meta.notecharS8.4Total sky flux density at 8.4 GHzuJyphot.flux.density;em.radio.6-12GHzintl_Sp+IndexLimit flag on Sp+Indexmeta.code.errorcharSp+Index? Spectral indexspect.indexfloatnullableIDTypeOptical identification type (G2)src.classcharl_ImagLimit flag on Imagmeta.code.errorcharImag? The I band magnitudemagphot.mag;em.opt.IfloatnullableXrayDetection of X-ray emission (1)meta.codechar_RARight ascension (derived from [FKP2002]) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from [FKP2002]) for Eq=J2000degpos.eq.dec;meta.main