J/A+A/627/A175ivo://CDS.VizieR/J/A+A/627/A175doi:10.26093/cds/vizier.36270175CDSMedina S.-N.X.Urquhart J.S.Dzib S.A.Brunthaler A.Cotton B.,Menten K.M.Wyrowski F.Beuther H.Billington S.J.Carrasco-Gonzalez C.,Csengeri T.Gong Y.Hofner P.Nguyen H.Ortiz-Leon G.N.Ott J.,Pandian J.D.Roy N.Sarkar E.Wang Y.Winkel B.2019-10-16T14:55:22Z2019-07-19T07:39:55ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesgalaxy-planesmilky-way-galaxyRadio continuum surveys of the Galactic plane are an excellent way to identify different source populations such as planetary nebulae, HII regions, and radio stars and characterize their statistical properties. The Global View of Star Formation in the Milky Way (GLOSTAR) survey will study the star formation in the Galactic plane between -2{deg}<l<85{deg} and |b|<1{deg} with unprecedented sensitivity in both flux density (~40uJy/beam) and range of angular scales (~1.5" to the largest radio structures in the Galaxy). In this paper we present the first results obtained from a radio continuum map of a 16-square-degree-sized region of the Galactic plane centered on l=32{deg} and b=0{deg} (28{deg}<l<36{deg} and |b|<1{deg}). This map has a resolution of 18" and a sensitivity of 60-150uJy/beam. We present data acquired in 40 hours of observations with the VLA in D-configuration. Two 1GHz wide sub-bands were observed simultaneously and they were centered at 4.7 and 6.9GHz. These data were calibrated and imaged using the Obit software package. The source extraction was performed using the BLOBCAT software package and verified through a combination of visual inspection and cross-matching with other radio and mid-infrared surveys. The final catalog consists of 1575 discrete radio sources and 27 large scale structures (including W43 and W44). By crossmatching with other catalogs and calculating the spectral indices (S({nu}){prop.to}{nu}^{alpha}^), we have classified 231 continuum sources as HII regions, 37 as ionization fronts, and 46 as planetary nebulae. The longitude and latitude distribution and negative spectral indices are all consistent with the vast majority of the unclassified sources being extragalactic background sources. We present a catalog of 1575 radio continuum sources and discuss their physical properties, emission nature, and relation to previously reported data. These first GLOSTAR results have increased the number of reliable HII regions in this part of the Galaxy by a factor of four.2019A&A...627A.175Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/627/A175CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/205/1 : CORNISH project. II. Source catalog (Purcell+, 2013)J/A+A/615/A103 : CORNISH project. III. UCHII region catalogueJ/MNRAS/480/2423 : CORNISH project IV. Radio-selected galactic PNhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/627/A175https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/627/A175http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/627/A175https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/627/A175https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/627/A175http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/627/A175GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/627/A175/table7 (GLOSTAR source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/627/A175/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/627/A175/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/627/A175/table7?GETtext/xml+votable180.050000true280.55582-4.361260.0055555555555555565/7564 7567 7578-7579 6/30234 30245 30247 30260 30262-30265 30306-30307 30330 30401 30404-30405 30407 30416 304183.313034785154005e-24 3.8431204771608934e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/627/A175?format=asciiRadiodefaultJ/A+A/627/A175/table7GLOSTAR source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGLOSTAR name constructed from the peak flux density positions (GLLL.lll+BB.bbb)meta.id;meta.maincharn_Name[+ ] Note on Name (1)meta.notecharGLONGalactic longitude (2)degpos.galactic.lonGLATGalactic latitude (2)degpos.galactic.latSNRSignal to noise value (3)stat.snr;stat.valuefloatSpeakPeak flux density value at 5.8GHzmJy/beamphot.flux.density;em.radio.3-6GHzfloate_SpeakError in the peak flux density valuesmJy/beamstat.errorfloatSintIntegrated flux density value at 5.8GHzmJyphot.flux.density;em.radio.3-6GHzfloate_SintError in the integrated flux density valuesmJystat.errorfloatY-factorRatio of the integrated and peak flux densitiesphot.flux;stat.maxfloatRadius? Radius, determined from the number of pixels associated with the source (4)arcsecphys.angSizefloatnullablealpha? Spectral index value calculated from THOR and GLOSTAR are 1.5GHz and 5.8GHz, respectivelyspect.indexfloatnullablee_alpha? Error of the spectral index value calculated from THOR and GLOSTAR are 1.5GHz and 5.8GHz, respectivelystat.error;spect.indexfloatnullablealpha*? Spectral index value calculated from the 8 sub-images of GLOSTARspect.indexfloatnullablee_alpha*? Error of the spectral index value calculated from the 8 sub-images of GLOSTARstat.error;pos.eq.rafloatnullableClassClassification assigned to the sourcesrc.classcharRef[1/8]? Reference from previous detection when is available (5)meta.ref;pos.frameintnullableFileNameName of the FITS image in subdirectory fitsmeta.id;meta.fitscharFig17Name of the eps 3-colour image in subdirectory fig17meta.id;obs.imagechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedJ/A+A/627/A175/table2Large scale structuresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharn_NameNote on Name (1)meta.notecharlminMinimum longitude position of the sourcedegpos.earth.lon;stat.minfloatlmaxMaximum longitude position of the sourcedegpos.earth.lon;stat.maxfloatbminMinimum latitude position of the sourcedegpos.earth.lat;stat.minfloatbmaxMaximum latitude position of the sourcedegpos.earth.lat;stat.maxfloatIntFluxIntegrated flux at 5.8GHzJyphot.flux.density;em.radio.3-6GHzfloatFileNameName of the fits images in subdirectory fitsmeta.id;meta.fitscharJ/A+A/627/A175/table5Catalog names and fluxes for CORNISH sources not detected in GLOSTARrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCORNISHCORNISH source namemeta.id;meta.maincharSpeakPeak flux at 5GHz from CORNISHmJy/beamphot.flux.density;em.radio.3-6GHzfloatSintIntegrated flux at 5GHz from CORNISHmJyphot.flux.density;em.radio.3-6GHzfloatrmsMeasured rms towards the position of the CORNISH sources in the GLOSTAR mapmJy/beamstat.stdevfloatFileNameName of the fits images in subdirectory fitsmeta.id;meta.fitschar