J/MNRAS/462/917ivo://CDS.VizieR/J/MNRAS/462/917doi:10.26093/cds/vizier.74620917CDSRiseley C.J.Scaife A.M.M.Hales C.A.Harrison I.Birkinshaw M.,Battye R.A.Beswick R.J.Brown M.L.Casey C.M.Chapman S.C.,Demetroullas C.Hung C.-L.Jackson N.J.Muxlow T.Watson B.2024-08-16T20:18:50Z2017-01-04T13:29:27ZCDS support team

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

cds-question@unistra.frsurveysgalaxy-clustersradio-galaxiesWe present the results of 325MHz Giant Metrewave Radio Telescope observations of a supercluster field, known to contain five Abell clusters at redshift z~0.2. We achieve a nominal sensitivity of 34uJy/beam towards the phase centre. We compile a catalogue of 3257 sources with flux densities in the range 183uJy-1.5Jy within the entire ~6.5deg^2^ field of view. Subsequently, we use available survey data at other frequencies to derive the spectral index distribution for a sub-sample of these sources, recovering two distinct populations - a dominant population which exhibit spectral index trends typical of steep-spectrum synchrotron emission, and a smaller population of sources with typically flat or rising spectra. We identify a number of sources with ultrasteep spectra or rising spectra for further analysis, finding two candidate high-redshift radio galaxies and three gigahertz-peaked-spectrum radio sources. Finally, we derive the Euclidean-normalized differential source counts using the catalogue compiled in this work, for sources with flux densities in excess of 223uJy. Our differential source counts are consistent with both previous observations at this frequency and models of the low-frequency source population. These represent the deepest source counts yet derived at 325MHz. Our source counts exhibit the well-known flattening at mJy flux densities, consistent with an emerging population of star-forming galaxies; we also find marginal evidence of a downturn at flux densities below 308uJy, a feature so far only seen at 1.4GHz.2016MNRAS.462..917Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/917CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/917https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/917http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/917https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/917https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/917http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/917GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/462/917/scg (The 325MHz source population of the Super-CLASS field (full table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/462/917/scg?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/462/917/scg?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/462/917/scg?GETtext/xml+votable180.050000true159.583708367.45033610.0055555555555555565/1904 6/7487 7530 7573 7575 7581 7583 7624-76262.1534725313611987e-25 2.1534725313611987e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/462/917?format=asciiRadiodefaultJ/MNRAS/462/917/scgThe 325MHz source population of the Super-CLASS field (full table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSCGDesignation (JHHMMSS+SSMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSiIntegrated flux density at 325MHzmJyphot.flux.density;em.radio.200-400MHzfloate_SiIntegrated flux density uncertaintymJystat.errorfloatSpPeak flux density at 325MHzmJy/beamphot.flux.density;em.radio.200-400MHzfloate_SpPeak flux density uncertaintymJy/beamstat.error;src.spTypefloatMajDiam? Deconvolved major axisarcsecphys.angSizefloatnullableMinDiam? Deconvolved minor axisarcsecphys.angSizefloatnullablePA? Deconvolved position angledegpos.posAngfloatnullablee_MajDiam? Deconvolved major axis uncertaintyarcsecstat.errorfloatnullablee_MinDiam? Deconvolved minor axis uncertaintyarcsecstat.errorfloatnullablee_PA? Deconvolved p.a. uncertaintydegstat.errorfloatnullable