J/A+A/457/517ivo://CDS.VizieR/J/A+A/457/517doi:10.26093/cds/vizier.34570517CDSPrandoni I.Parma P.Wieringa M.H.De Ruiter H.R.Gregorini L.,Mignano A.Vettolani G.Ekers R.D.2018-10-02T11:13:13Z2007-07-10T11:57:54ZCDS support team

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

cds-question@unistra.frradio-sourcesgalaxy-classification-systemsThe nature and evolutionary properties of the faint radio population, responsible for the steepening observed in the 1.4GHz source counts below 1mJy, are not yet entirely clear. Radio spectral indices may help to constrain the origin of the radio emission in such faint radio sources and may be fundamental in understanding eventual links to the optical light. We study the spectral index behaviour of sources that were found in the 1.4GHz ATESP survey (Prandoni et al., 2000A&AS..146...31P & 2000, Cat. <VIII/63>), considering that the ATESP is one of the most extensive sub-mJy surveys existing at present. Using the Australia Telescope Compact Array we observed at 5GHz part of the region covered by the sub-mJy ATESP survey. In particular we imaged a one square degree area for which deep optical imaging in UBVRIJK is available. In this paper we present the 5GHz survey and source catalogue, we derive the 5GHz source counts and we discuss the 1.4-5GHz spectral index properties of the ATESP sources. The analysis of the optical properties of the sample will be the subject of a following paper.2006A&A...457..517Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/457/517CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/63 : ATESP radio survey. II. (Prandoni+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/457/517https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/457/517http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/457/517https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/457/517https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/457/517http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/457/517GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/457/517/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/457/517/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/457/517/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/457/517/list?GETtext/xml+votable180.050000true341.91491-40.219440.005555555555555556Cone search capability for table J/A+A/457/517/table6 (The 5GHz catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/457/517/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/457/517/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/457/517/table6?GETtext/xml+votable180.050000true341.2617917-40.070750.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/457/5175/11628 6/46503 46509 465209.276497240453405e-25 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/457/517?format=asciiRadioOpticaldefaultJ/A+A/457/517/listList of fits imagesAssocDataAssociated Data web pagemeta.bib.pagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.DateObservation date (YYYY/MM/DDThh:mm:ss.s)time.epoch;obscharFreqObserved frequencyGHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharJ/A+A/457/517/table41.4-5GHz spectral index of ATESP sourcesS1.4GHzFlux density at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintATESP55GHz IAU name (JHHMMSS+DDMMSS)meta.id;meta.maincharATESP1.4GHz IAU name (JHHMMSS+DDMMSS, Cat. VIII/63)meta.idcharl_S5GHzLimit flag on S5GHzmeta.code.errorcharS5GHzFlux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatl_S1.4GHzLimit flag on S1.4GHzmeta.code.errorcharl_alphaLimit flag on alphameta.code.error;pos.eq.racharalpha1.4-5GHz spectral indexspect.indexfloate_alpha? rms uncertainty on alphastat.error;pos.eq.rafloatnullableJ/A+A/457/517/table6The 5GHz cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintATESP5ATESP5 IAU namemeta.id;meta.maincharprimarym_ATESP5[AB] Multiplicity index on ATESP5meta.code.multipcharRAL? Right ascension (J2000) Low resolutionpos.eq.ranullableDEL? Declination (J2000), Low resolutionpos.eq.decnullableSpL? 5GHz peak flux density, Low resolutionmJyphot.flux.density;em.radio.3-6GHzfloatnullableStotL? 5GHz integrated flux density, Low resolutionmJyphot.flux.density;em.radio.3-6GHzfloatnullableMajL? FWHM of major axis, Low resolutionarcsecpos.angResolutionfloatnullableMinL? FWHM of minor axis, Low resolutionarcsecpos.angResolutionfloatnullablePAL[-180/180]? Position angle, Low resolution (1)degpos.posAngfloatnullablef_PAL[EM S*] Flag on PA, Low resolution (2)meta.codecharsigmaL? Local noise level used for the source detection, Low resolutionuJyinstr.det.noise;pos.lg;pos.lsrintnullableRAF? Right ascension (J2000), Full resolutionpos.eq.ranullableDEF? Declination (J2000), Full resolutionpos.angResolutionnullablel_SpFLimit flag on SpeakFmeta.code.errorcharSpF? 5GHZ peak flux density, Full resolutionmJyphot.flux.density;em.radio.3-6GHzfloatnullableStotF? 5GHZ integrated flux density, Full resolutionmJyphot.flux.density;em.radio.3-6GHzfloatnullableMajF? FWHM major axis, Full resolutionarcsecpos.angResolutionfloatnullableMinF? FWHM minor axis, Full resolutionarcsecpos.angResolutionfloatnullablePAF[-180/180]? Position angle, Full resolution (1)degpos.posAngfloatnullablef_PAF[EMDU S*] Flag on PAF, Full resolution (2)meta.codecharn_PAF[a-i ] Flag (3)meta.notecharsigmaF? Local noise level used for the source detection, Full resolutionuJyinstr.det.noise;pos.lg;pos.lsrintnullable_RAPosition, from full-resolution or, if not existing, from low-resolution (right ascension part)degpos.eq.ra;meta.main_DEPosition, from full-resolution or, if not existing, from low-resolution (declination part)degpos.eq.dec;meta.main