J/MNRAS/454/952ivo://CDS.VizieR/J/MNRAS/454/952doi:10.26093/cds/vizier.74540952CDSHuynh M.T.Bell M.E.Hopkins A.M.Norris R.P.Seymour N.2024-08-15T20:16:31Z2016-09-12T08:24:27ZCDS support team

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

cds-question@unistra.frsurveysgalaxiescatalogsradio-sourcesgalaxy-classification-systemsWe present a new image of the 5.5GHz radio emission from the extended Chandra Deep Field South. Deep radio observations at 5.5GHz were obtained in 2010 and presented in the first data release. A further 76h of integration has since been obtained, nearly doubling the integration time. This paper presents a new analysis of all the data. The new image reaches 8.6{mu}Jy rms, an improvement of about 40% in sensitivity. We present a new catalogue of 5.5GHz sources, identifying 212 source components, roughly 50% more than were detected in the first data release. Source counts derived from this sample are consistent with those reported in the literature for S_5.5GHz_>0.1mJy but significantly lower than published values in the lowest flux density bins (S_5.5GHz_<0.1mJy), where we have more detected sources and improved statistical reliability. The 5.5GHz radio sources were matched to 1.4GHz sources in the literature and we find a mean spectral index of -0.35+/-0.10 for S_5.5GHz_>0.5mJy, consistent with the flattening of the spectral index observed in 5GHz sub-mJy samples. The median spectral index of the whole sample is {alpha}_med_=-0.58, indicating that these observations may be starting to probe the star-forming population. However, even at the faintest levels (0.05<S_5.5GHz_<0.1mJy), 39% of the 5.5GHz sources have flat or inverted radio spectra. Four flux density measurements from our data, across the full 4.5-6.5GHz bandwidth, are combined with those from literature and we find 10% of sources (S_5.5GHz_>~0.1mJy) show significant curvature in their radio spectral energy distribution spanning 1.4-9GHz.2015MNRAS.454..952Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/952CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/426/2342 : Chandra Deep Field South ATLAS 5.5GHz survey (Huynh+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/952https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/952http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/952https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/952https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/952http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/952GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/454/952/table2 (The ATLAS 5.5GHz DR2 catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/454/952/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/454/952/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/454/952/table2?GETtext/xml+votable180.050000true53.453125-28.04252780.0055555555555555566/35934-35935 359579.276497240453405e-25 3.644338263669406e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/454/952?format=asciiOpticalRadiodefaultJ/MNRAS/454/952/table2The ATLAS 5.5GHz DR2 cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintm_Seq[ABCD] Multiplicity index on Seq Column (indicates a component of a multiple source)meta.code.multipcharATCDFS5Source ATCDFS5 IAU name (JHHMM.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpeakPoint source flux density at 5.5GHz (peak flux density for deconvolved sources)uJyphys.angSizeinte_SpeakUncertainty in point source flux density or peak flux density for deconvolved sourcesuJystat.errorintSint? Integrated flux density at 5.5GHz (1)uJyphot.flux.density;em.radio.3-6GHzintnullablee_Sint? Uncertainty in integrated flux density (1)uJystat.errorintnullableBmaj? Deconvolved major axis (2)arcsecphys.angSizefloatnullableBmin? Deconvolved minor axis (2)arcsecphys.angSize;srcfloatnullablePA[]? Deconvolved position angle, measured from north through east (2)degpos.posAngfloatnullablerms? Local noise level, rmsuJyinstr.det.noise;pos.lg;pos.lsrfloatnullableJ/MNRAS/454/952/table4The 1.4-5.5GHz spectral index of the ATCA 5.5GHz samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintS5.5GHzFlux density at 5.5GHzuJyphot.flux.density;em.radio.3-6GHzintS1.4GHzFlux density at 1.4GHzuJyphot.flux.density;em.radio.750-1500MHzfloatalpha1.4-5.5GHz spectral indexspect.indexfloate_alpharms uncertainty on alphastat.error;pos.eq.rafloatJ/MNRAS/454/952/table5Summary of radio SED fitting resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintgammalgamma for log-linear fit (1)stat.fit.paramfloate_gammalrms uncertainty on gammal (1)stat.errorfloatalphalalpha for log-linear fit (1)spect.indexfloate_alphalrms uncertainty on alpha (1)stat.errorfloatgammaqgamma for log-quadratic fit (1)stat.fit.paramfloate_gammaqrms uncertainty on gammaq (1)stat.errorfloatalphaqalpha for log-quadratic fit (1)spect.indexfloate_alphaqrms uncertainty on alphaq (1)stat.errorfloatbetaqbeta for log-quadratic fit (1)stat.fit.paramfloate_betaqrms uncertainty on log-quadratic fit (1)stat.errorfloat