J/A+A/588/A97ivo://CDS.VizieR/J/A+A/588/A97doi:10.26093/cds/vizier.35880097CDSBihr S.Johnston K.G.Beuther H.Anderson L.D.Ott M.Rugel J.,Bigiel F.Brunthaler A.Glover S.C.O.Henning T.Heyer M.H.,Klessen R.S.Linz H.Longmore S.N.McClure-Griffiths N.M.Menten K.M.,Plume R.Schierhuber T.Shanahan R.Stil J.M.Urquhart J.S.Walsh A.J.2016-03-23T07:32:31Z2016-03-23T08:31:35ZCDS support team

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

cds-question@unistra.frsurveysradio-continuum-emissionmilky-way-galaxyWe carried out a large program with the Karl G. Jansky Very Large Array (VLA): "THOR: The HI, OH, Recombination line survey of the Milky Way". We observed a significant portion of the Galactic plane in the first quadrant of the Milky Way in the 21cm HI line, 4 OH transitions, 19 radio recombination lines, and continuum from 1 to 2GHz. In this paper we present a catalog of the continuum sources in the first half of the survey (l=14.0-37.9{deg} and l=47.1-51.2{deg}, |b|<1.1{deg}) at a spatial resolution of 10-25", depending on the frequency and sky position with a spatially varying noise level of ~0.3-1mJy/beam. The catalog contains ~4400 sources. Around 1200 of these are spatially resolved, and ~1000 are possible artifacts, given their low signal-to-noise ratios. Since the spatial distribution of the unresolved objects is evenly distributed and not confined to the Galactic plane, most of them are extragalactic. Thanks to the broad bandwidth of the observations from 1 to 2GHz, we are able to determine a reliable spectral index for ~1800 sources. The spectral index distribution reveals a double-peaked profile with maxima at spectral indices of alpha=-1 and alpha=0, corresponding to steep declining and flat spectra, respectively. This allows us to distinguish between thermal and non-thermal emission, which can be used to determine the nature of each source. We examine the spectral index of ~300 known HII regions, for which we find thermal emission with spectral indices around alpha=0. In contrast, supernova remnants (SNR) show non-thermal emission with alpha=-0.5 and extragalactic objects generally have a steeper spectral index of alpha=-1. Using the spectral index information of the THOR survey, we investigate potential SNR candidates. We classify the radiation of four SNR candidates as non-thermal, and for the first time, we provide strong evidence for the SNR origin of these candidates.2016A&A...588A..97Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/588/A97CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/580/A112 : THOR. The HI, OH, Recombination Line Survey (Bihr+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/588/A97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/588/A97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/588/A97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/588/A97https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/588/A97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/588/A97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/588/A97/catalog (Table containing all sources (table C1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/588/A97/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/588/A97/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/588/A97/catalog?GETtext/xml+votable180.050000true273.8248-16.33090.0055555555555555565/7279 7365 7376-7377 7380 7382-7383 7554 7561 7564-7565 7567 7578-7579 7604 7672-7673 6/29113 29115 29162-29163 29166 29457 29513 29516-29517 29519 29526-29527 29556-29557 30210 30220 30222-30223 30234 30240-30241 30243 30253 30264-30265 30306-30307 30310 30328 30330-30331 30334 30400-30401 30404-30405 30407 30420 30422 30425 30428 30666-30667 30670 30696-30697 30700-30701 30703-30704 30706 30712 307147.023633365379749e-25 1.2920835978056238e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/588/A97?format=asciiRadiodefaultJ/A+A/588/A97/catalogTable containing all sources (table C1)NpixNumber of pixels flooded by BLOBCATmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGNameName of the source (GLL.lll+B.bbb)meta.id;meta.maincharRAJ2000Right ascension in J2000 of the peak positiondegpos.eq.ra;meta.mainDEJ2000Declination in J2000 of the peak positiondegpos.eq.dec;meta.mainSpPeak intensity of average image used for source extraction (Jy/beam) (1)Jyphot.flux.density;em.radiodoubleSNRSignal-to-noise ratio in the averaged imagestat.snr;arith.ratiofloatSintIntegrated flux density of the averaged image (1)Jyphot.flux.density;em.radiodoubleBMAJMajor axis of the resolution element used for the source extractionarcsecphys.angSizefloatBMINMinor axis of the resolution element used for the source extractionarcsecphys.angSize;srcfloatBPARotation angle of the resolution element used for the source extractiondegpos.posAngfloatres[0/1] Resolved source label. 1 = True, 0 = False.meta.codeintart[0/1] Label for possible artifacts and/ or SNR<7. 1 = True, 0 = False.meta.codeintSp1060Peak intensity around 1.06GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.radio.750-1500MHzdoublee_Sp1060Uncertainty of Sp1060 (Jy/beam) (2)Jystat.errordoubleSp1310Peak intensity around 1.31GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.radio.750-1500MHzdoublee_Sp1310Uncertainty of Sp1.31 (Jy/beam) (2)Jystat.errordoubleSp1440Peak intensity around 1.44GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.IR.8-15umdoublee_Sp1440Uncertainty of Sp1.44 (Jy/beam) (2)Jystat.errordoubleSp1690Peak intensity around 1.69GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.radio.1500-3000MHzdoublee_Sp1690Uncertainty of Sp1.69 (Jy/beam) (2)Jystat.errordoubleSp1820Peak intensity around 1.82GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.radio.1500-3000MHzdoublee_Sp1820Uncertainty of Sp1.82 (Jy/beam) (2)Jystat.errordoubleSp1950? Peak intensity around 1.95GHz used for spectral index (Jy/beam) (2)Jyphot.flux.density;em.radio.1500-3000MHzdoublenullablee_Sp1950? Uncertainty of Sp1.95 (Jy/beam) (2)Jystat.errordoublenullablealphaSpectral index of source using all available data pointsspect.indexfloate_alphaUncertainty of spectral indexstat.error;pos.eq.rafloatq_alpha[0/1] Label for reliable spectral index 1 = True, 0 = Falsemeta.code.qual;pos.eq.raint