J/ApJS/144/213ivo://CDS.VizieR/J/ApJS/144/213doi:10.26093/cds/vizier.21440213CDSSwartz D.A.Ghosh K.K.McCollough M.L.Pannuti T.G.Tennant A.F.Wu K.2004-04-25T17:50:21Z2004-04-25T17:49:22ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryx-ray-sourcesA Chandra X-Ray Observatory ACIS-S imaging observation is used to study the population of X-ray sources in the nearby Sab galaxy M81 (NGC 3031). A total of 177 sources are detected with 124 located within the D_25_ isophote to a limiting X-ray luminosity of ~3x10^36^erg/s. Source positions, count rates, luminosities in the 0.3-8.0 keV band, limiting optical magnitudes, and potential counterpart identifications are tabulated. Spectral and timing analysis of the 36 brightest sources are reported including the low-luminosity active galactic nucleus, SN 1993J, and the Einstein-discovered ultraluminous X-ray source X6.2003ApJS..144..213Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/144/213CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/554/202 : ROSAT X-ray observations of M81 (Immler+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/144/213https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/144/213http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/144/213https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/144/213https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/144/213http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/144/213GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/144/213/table2 (M81 Discrete X-Ray Sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/144/213/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/144/213/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/144/213/table2?GETtext/xml+votable180.050000true148.160416768.943750.005555555555555556Chandra6/7603 7606https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/144/213?format=asciiX-rayOpticaldefaultJ/ApJS/144/213/table2M81 Discrete X-Ray SourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SGM2003]The X-ray source numbermeta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainCRateAperture-corrected number of source counts0.0001count.s**-1phot.count;em.X-rayfloate_CRateUncertainty in CRate0.0001count.s**-1stat.errorfloatS/RSignal-to-Noise ratio for CRatestat.snrfloatl_VmagLimit flag on Vmagmeta.code.errorcharVmag? The visual magnitude (1)magphot.mag;em.opt.Vfloatnullablef_Vmag[HI] Flag on Vmag (2)meta.code.errorcharCCDCHANDRA ACIS CCD device identificationmeta.id;instrcharRegionGlobal environment code (3)meta.notecharXLumX-ray luminosity (4)1e+30Wphys.luminosity;em.X-rayfloate_XLumUncertainty in XLum1e+30Wstat.errorfloatComAdditional comments (5)meta.notecharJ/ApJS/144/213/table3M81 Bright X-Ray SourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SGM2003]Sequential numbermeta.id;meta.mainintNHHydrogen column density1e+20cm**-2phys.columnDensityfloate_NHrms uncertainty on NH1e+20cm**-2stat.errorfloatSp-IndexSpectral parameter (1)spect.indexfloate_Sp-Indexrms uncertainty on SpParstat.errorfloatchi2chi^2^ valuestat.fit.chi2floatDOFDegrees of freedomstat.fit.dofintXLumX-ray luminosity1e+30Wphys.luminosity;em.X-rayfloate_XLumrms uncertainty on XLum1e+30Wstat.errorfloatPKSKolmogorov-Smirnov statistic result (2)stat.fit.goodnessfloat