J/MNRAS/460/4433ivo://CDS.VizieR/J/MNRAS/460/4433doi:10.26093/cds/vizier.74604433CDSHeywood I.Jarvis M.J.Baker A.J.Bannister K.W.Carvalho C.S.,Hardcastle M.Hilton M.Moodley K.Smirnov O.M.Smith D.J.B.,White S.V.Wollack E.J.2024-08-16T20:17:33Z2017-12-19T16:03:14ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesgalaxy-classification-systemsWe have used the Karl G. Jansky Very Large Array to image ~100deg^2^ of SDSS Stripe 82 at 1-2GHz. The survey consists of 1026 snapshot observations of 2.5-min duration, using the hybrid CnB configuration. The survey has good sensitivity to diffuse, low surface brightness structures and extended radio emission, making it highly synergistic with existing 1.4GHz radio observations of the region. The principal data products are continuum images, with 16x10 arcsec resolution, and a catalogue containing 11782 point and Gaussian components resulting from fits to the thresholded Stokes-I brightness distribution, forming approximately 8948 unique radio sources. The typical effective 1{sigma} noise level is 88{mu}Jy/beam. Spectral index estimates are included, as derived from the 1GHz of instantaneous bandwidth. Astrometric and photometric accuracy are in excellent agreement with existing narrowband observations. A large-scale simulation is used to investigate clean bias, which we extend into the spectral domain. Clean bias remains an issue for snapshot surveys with the VLA, affecting our total intensity measurements at the ~1{sigma} level. Statistical spectral index measurements are in good agreement with existing measurements derived from matching separate surveys at two frequencies. At flux densities below ~35{sigma} the median in-band spectral index measurements begin to exhibit a bias towards flatness that is dependent on both flux density and the intrinsic spectral index. In-band spectral curvature measurements are likely to be unreliable for all but the very brightest components. Image products and catalogues are publicly available via an FTP server (ftp://ftp.atnf.csiro.au/pub/people/hey036/Stripe82).2016MNRAS.460.4433Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/460/4433CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/142/3 : 1.4GHz observations of Stripe 82 (Hodge+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/460/4433https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/460/4433http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/460/4433https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/460/4433https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/460/4433http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/460/4433GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/460/4433/table1e (Eastern catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/460/4433/table1e?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/460/4433/table1e?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/460/4433/table1e?GETtext/xml+votable180.050000true341.875860.001740.005555555555555556Cone search capability for table J/MNRAS/460/4433/table1w (Western catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/460/4433/table1w?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/460/4433/table1w?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/460/4433/table1w?GETtext/xml+votable180.050000true14.773230.114210.0055555555555555564/1114 1125-1126 5/4415 4431 4451 4453-4454 4460 4464 4499 4508 4528 4544 4671 4687 4707-4710 4712-4714 4755-4758 4761 6/17659 17723 17768 17770-17771 17799 17803 17809-17811 17820-17822 17844 17848 17975 17979 17981-17983 17995 18036 18040 18068-18069 18071 18116 18180 18184 18679 18683 18747 18792 18794-18795 18823 18827 18844-18846 18860-18862 18864-18866 18880-18882 19015 19019 19036-19038 19041 19053 19056-19058 19200-192021.325213914061602e-24 1.325213914061602e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/460/4433?format=asciiOpticalRadiodefaultJ/MNRAS/460/4433/table1eEastern cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_RAJ20001{sigma} uncertainty in RAarcsecstat.error;pos.eq.rafloate_DEJ20001{sigma} uncertainty in DEarcsecstat.error;pos.eq.decfloatSintIntegrated flux density at 1-2GHzmJyphot.flux.density;em.radio.1500-3000MHzdoublee_Sint1{sigma} uncertainty in SintmJystat.errorfloatSpeakPeak flux density at 1-2GHzmJy/beamphot.flux.density;em.radio.1500-3000MHzdoublee_Speak1{sigma} uncertainty in SpeakmJy/beamstat.errorfloatrmsEstimate of the local RMS noise at the position of the componentuJy/beaminstr.det.noise;pos.lg;pos.lsrfloatalphaSpectral index (1)spect.indexfloatMaj? Deconvolved major-axis size of the Gaussian fitted to the component (2)arcsecphys.angSizefloatnullablee_Maj? 1{sigma} uncertainty in Majarcsecstat.errorfloatnullableMin? Deconvolved minor-axis size of the Gaussian fitted to the component (2)arcsecphys.angSize;srcfloatnullablee_Min? 1{sigma} uncertainty in Minarcsecstat.error;stat.minfloatnullablePA? Position angle measured east of north of the Gaussian fitteddegpos.posAngdoublenullablee_PA? uncertainty in PAdegstat.errordoublenullableRes[0/1] flag to indicate whether or not the component is likely to be reliably spatially resolved, i.e. does the component lie above the upper envelope on Fig. 13.meta.codeintIDgZero-indexed unique identifier for the componentmeta.idintIDsZero-indexed unique identifier for the sourcemeta.idintIDiZero-indexed unique identifier for the islandmeta.idintJ/MNRAS/460/4433/table1wWestern cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_RAJ20001{sigma} uncertainty in RAarcsecstat.error;pos.eq.rafloate_DEJ20001{sigma} uncertainty in DEarcsecstat.error;pos.eq.decfloatSintIntegrated flux density at 1-2GHzmJyphot.flux.density;em.radio.1500-3000MHzdoublee_Sint1{sigma} uncertainty in SintmJystat.errorfloatSpeakPeak flux density at 1-2GHzmJy/beamphot.flux.density;em.radio.1500-3000MHzdoublee_Speak1{sigma} uncertainty in SpeakmJy/beamstat.errorfloatrmsEstimate of the local RMS noise at the position of the componentuJy/beaminstr.det.noise;pos.lg;pos.lsrfloatalphaSpectral index (1)spect.indexfloatMaj? Deconvolved major-axis size of the Gaussian fitted to the component (2)arcsecphys.angSizefloatnullablee_Maj? 1{sigma} uncertainty in Majarcsecstat.errorfloatnullableMin? Deconvolved minor-axis size of the Gaussian fitted to the component (2)arcsecphys.angSize;srcfloatnullablee_Min? 1{sigma} uncertainty in Minarcsecstat.error;stat.minfloatnullablePA? Position angle measured east of north of the Gaussian fitteddegpos.posAngdoublenullablee_PA? uncertainty in PAdegstat.errordoublenullableRes[0/1] flag to indicate whether or not the component is likely to be reliably spatially resolved, i.e. does the component lie above the upper envelope on Fig. 13.meta.codeintIDgZero-indexed unique identifier for the componentmeta.idintIDsZero-indexed unique identifier for the sourcemeta.idintIDiZero-indexed unique identifier for the islandmeta.idint