J/A+AS/131/303ivo://CDS.VizieR/J/A+AS/131/303CDSStanghellini C.O'Dea C.P.Dallacasa D.Baum S.A.Fanti R.Fanti C.1998-08-05T22:11:47Z1998-08-05T22:11:38ZCDS support team

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

cds-question@unistra.frradio-sourcesWe define a complete sample of thirty-three GHz-Peaked-Spectrum (GPS) radio sources based on their spectral properties. We present measurements of the radio spectra and polarization of the complete sample and a list of additional GPS sources which fail one or more criteria to be included in the complete sample. The majority of the data have been obtained from quasi-simultaneous multi-frequency observations at the Very Large Array (VLA) during 3 observing sessions. Low frequency data from the Westerbork Synthesis Radio Telescope (WSRT) and from the literature have been combined with the VLA data in order to better define the spectral shape. The objects presented here show a rather wide range of spectral indices at high and low frequencies, including a few cases where the spectral index below the turnover is close to the theoretical value of 2.5 typical of self-absorbed incoherent synchrotron emission. Faint and diffuse extended emission is found in about 10% of the sources. In the majority of the GPS sources, the fractional polarization is found to be very low, consistent with the residual instrumental polarization of 0.3%.1998A&AS..131..303Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/131/303CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)VIII/18 : 6C Survey of radio sources I. (Baldwin+ 1985)VIII/21 : 6C Survey of radio sources II. (Hales+ 1988)VIII/22 : 6C Survey of Radio Sources III. (Hales+ 1990)VIII/23 : 6C Survey of radio sources IV. (Hales+ 1991)VIII/24 : 6C Survey of Radio Sources V. (Hales+ 1993)VIII/25 : 6C Survey of radio sources VI. (Hales+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/131/303https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/131/303http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/131/303https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/131/303https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/131/303http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/131/303GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/A+AS/131/303/table4Flux densities for the complete sampleSnuFlux densityJyphot.flux.density;em.radio.3-6GHzfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource Name (1)meta.id;meta.maincharnuFrequencyGHzem.freqfloate_Snurms uncertainty on S (2)Jystat.errorfloatr_SnuReferences (3)meta.refintJ/A+AS/131/303/table5Flux densities for the additional objectsNameSource Name (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnuFrequencyGHzem.freqfloatSnuFlux densityJyphot.flux.density;em.radio.3-6GHzfloate_Snurms uncertainty on S (2)Jystat.errorfloatr_SnuReferences (3)meta.refint