J/A+A/564/A120ivo://CDS.VizieR/J/A+A/564/A120doi:10.26093/cds/vizier.35640120CDSPreibisch T.Mehlhorn M.Townsley L.Broos P.Ratzka T.2018-01-05T08:56:33Z2014-04-16T09:19:42ZCDS support team

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

cds-question@unistra.frh-ii-regionsx-ray-sourcesGum 31 is a prominent, but still rather poorly studied HII region around the stellar cluster NGC 3324 at the northwestern periphery of the Carina nebula complex. Our aim was to reveal and characterize the young stellar population in Gum 31. An X-ray survey is the only efficient way to identify young stars in this region with extremely high galactic field-star contamination that can avoid the strong biases of infrared excess selected samples of disk-bearing young stars. We used the Chandra observatory to perform a deep (70ks) X-ray observation of the Gum 31 region and detected 679 X-ray point sources. This extends and complements the X-ray survey of the central Carina nebula regions performed in the Chandra Carina Complex Project (CCCP). Using deep near-infrared images from our recent VISTA survey of the Carina nebula complex, our comprehensive Spitzer point-source catalog, and optical archive data, we identify counterparts for 75% of these X-ray sources.2014A&A...564A.120Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/564/A120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/564/A120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/564/A120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/564/A120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/564/A120https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/564/A120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/564/A120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/564/A120/sources (Catalog of the Chandra X-ray sources in the Gum 31 region (table1), with near- and mid-infrared photometry (table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/564/A120/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/564/A120/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/564/A120/sources?GETtext/xml+votable180.050000true159.1001289-58.6714250.0055555555555555566/380182.483060040379131e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/564/A120?format=asciiX-raydefaultJ/A+A/564/A120/sourcesCatalog of the Chandra X-ray sources in the Gum 31 region (table1), with near- and mid-infrared photometry (table3)SimbadNameSimbad column added by the CDSmeta.idcharSeq[1/679] X-ray catalog sequence number, sorted by RAmeta.idintprimaryf_Seq[g.] Source anomalies (5)meta.codecharNameIAU designation of the X-ray source (HHMMSS.ss+DDMMSS.s, J2000)meta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainePos[0/1.4] Position error (1)arcsecstat.error;posfloatthetaOff-axis angle {theta}arcmininstr.offsetfloatCtnetNet counts in the total energy band (0.5-8keV)ctphot.count;em.X-rayfloate_Ctnet1-{sigma} errors on net countsctstat.errorfloatBtBackground counts expected in the source extraction region (total band)ctinstr.background;obs.fieldfloatCHnetNet counts in the hard energy band (2-8keV)ctphot.count;em.X-rayfloatfPSF[0/1] Fraction of the PSF (at 1.497keV) enclosed within the extraction region (2)instr.det.psffloatSigni[1/30] Photometric significance (3)stat.fit.goodness;photfloatl_logPBLimit flag on logPBmeta.code.errorcharlogPB[-5/-2] Logarithmic probability P_B_ that the extracted counts (total band) are solely from background (4)stat.fit.goodnessfloatVar[abc] Variability characterization based on K-S statistic (total band) from the single ObsId showing the most variability (6)meta.code;src.varcharEmedBackground-corrected median photon energy (total band)keVem.energyfloatVISTAIAU designation of the corresponding VISTA source (HHMMSS.ss+DDMMSS.s, J2000)meta.id.assoccharJmag? Near-infrared photometry in the J bandmagphot.mag;em.IR.JfloatnullableHmag? Near-infrared photometry in the H bandmagphot.mag;em.IR.HfloatnullableKsmag? Near-infrared photometry in the Ks bandmagphot.mag;em.IR.KfloatnullableSNRJ? Signal-to-noise ratio of the J band flux measurementstat.snrfloatnullableSNRH? Signal-to-noise ratio of the H band flux measurementstat.snrfloatnullableSNRKs? Signal-to-noise ratio of the Ks band flux measurementstat.snrfloatnullableSrc[1/2]? Flag indicating the source of the JHK photometry: 1=VISTA, 2=2MASSmeta.noteintnullableSpitzerIAU designation of the corresponding Spitzer source (HHMMSS.ss+DDMMSS.s, J2000)meta.id.assocchar[3.4]? Mid-infrared photometry in the Spitzer IRAC 3.4{mu}m (1) bandmagphot.flux.density;em.IR.4-8umfloatnullable[4.5]? Mid-infrared photometry in the Spitzer IRAC 4.5{mu}m (2) bandmagphot.mag;em.IR.4-8umfloatnullable[5.8]? Mid-infrared photometry in the Spitzer IRAC 5.8{mu}m (3) bandmagphot.flux.density;em.IR.4-8umfloatnullable[8.0]? Mid-infrared photometry in the Spitzer IRAC 8.0{mu}m (4) bandmagphot.flux.density;em.IR.8-15umfloatnullableSNR1? Signal-to-noise ratio of IRAC-1 fluxstat.snrfloatnullableSNR2? Signal-to-noise ratio of IRAC-2 fluxstat.snrfloatnullableSNR3? Signal-to-noise ratio of IRAC-3 fluxstat.snrfloatnullableSNR4? Signal-to-noise ratio of IRAC-4 fluxstat.snrfloatnullable