J/ApJ/796/105ivo://CDS.VizieR/J/ApJ/796/105doi:10.26093/cds/vizier.17960105CDSFornasini F.M.Tomsick J.A.Bodaghee A.Krivonos R.A.An H.Rahoui F.,Gotthelf E.V.Bauer F.E.Stern D.2017-09-25T14:15:09Z2017-08-11T07:46:23ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyx-ray-sourcesx-ray-binary-starsccd-photometryWe present a catalog of 1415 X-ray sources identified in the Norma Arm Region Chandra Survey (NARCS), which covers a 2{deg}x0.8{deg} region in the direction of the Norma spiral arm to a depth of ~20 ks. Of these sources, 1130 are point-like sources detected with >=3{sigma} confidence in at least one of three energy bands (0.5-10, 0.5-2, and 2-10 keV), five have extended emission, and the remainder are detected at low significance. Since most sources have too few counts to permit individual classification, they are divided into five spectral groups defined by their quantile properties. We analyze stacked spectra of X-ray sources within each group, in conjunction with their fluxes, variability, and infrared counterparts, to identify the dominant populations in our survey. We find that ~50% of our sources are foreground sources located within 1-2 kpc, which is consistent with expectations from previous surveys. Approximately 20% of sources are likely located in the proximity of the Scutum-Crux and near Norma arm, while 30% are more distant, in the proximity of the far Norma arm or beyond. We argue that a mixture of magnetic and nonmagnetic cataclysmic variables dominates the Scutum-Crux and near Norma arms, while intermediate polars and high-mass stars (isolated or in binaries) dominate the far Norma arm. We also present the cumulative number count distribution for sources in our survey that are detected in the hard energy band. A population of very hard sources in the vicinity of the far Norma arm and active galactic nuclei dominate the hard X-ray emission down to f_X_~10^-14^ erg/cm^2^/s, but the distribution curve flattens at fainter fluxes. We find good agreement between the observed distribution and predictions based on other surveys.2014ApJ...796..105Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/796/105CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)II/348 : VISTA Variable in the Via Lactea Survey DR2 (Minniti+, 2017)J/ApJS/134/77 : ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001)J/ApJ/635/214 : Chandra X-ray sources and NIR identifications (Ebisawa+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/796/105https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/796/105http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/796/105https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/796/105https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/796/105http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/796/105GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/796/105/table3 (Catalog of Point and Extended Sources: Detection and Localization)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/796/105/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/796/105/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/796/105/table3?GETtext/xml+votable180.050000true248.11782889-47.632173060.005555555555555556Cone search capability for table J/ApJ/796/105/table5 (Catalog of Point and Extended Sources: Infrared Counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/796/105/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/796/105/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/796/105/table5?GETtext/xml+votable180.050000true248.11775194-47.631648890.0055555555555555565/10556 6/42213 42214 42215https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/796/105?format=asciiX-raydefaultJ/ApJ/796/105/table3Catalog of Point and Extended Sources: Detection and LocalizationFlagSource flag(s) (7)meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNARCS[1/1415] NARCS catalog numbermeta.idintIDChandra source identifier (CXOU JHHMMSS.s+DDMMSS in Simbad)meta.id;meta.maincharObsIDObservation identifier (1)meta.id;obs.param;obscharRAJ2000Right Ascension in decimal degrees (J2000) (2)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (2)degpos.eq.dec;meta.mainPosUncPositional uncertainty (3)arcsecstat.error;posfloatOffOffset angular separation of source and aim pointarcminpos.angDistance;arith.diffcharSigFBFull 0.5-10 keV band significance (4)phot.count;em.X-rayfloatSigSBSoft 0.5-2 keV band significance (4)phot.count;em.X-rayfloatSigHBHard 2-10 keV band significance (4)phot.count;em.X-rayfloatRadiusRadius of aperture source region (5)arcsecphys.angSize;obs.fieldcharPSFPoint spread function (6)arcsecinstr.det.psfcharJ/ApJ/796/105/table4Catalog of Point and Extended Sources: PhotometryQ[ABCDE] Quantile group (6)meta.idcharPFlagPhotometric flag (5)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNARCS[1/1415] NARCS catalog numbermeta.idintFBNetNet full 0.5-10 keV band source counts (1)ctphot.count;em.X-rayintE_FBNet? Upper 1{sigma} error in FBNetctstat.error;stat.maxintnullablee_FBNet? Lower 1{sigma} error in FBNetctstat.errorintnullableSBNetNet soft 0.5-2 keV band source counts (1)ctphot.count;em.X-rayintE_SBNet? Upper 1{sigma} error in SBNetctstat.error;stat.maxintnullablee_SBNet? Lower 1{sigma} error in SBNetctstat.errorintnullableHBNetNet hard 2-10 keV band source counts (1)ctphot.count;em.X-rayintE_HBNet? Upper 1{sigma} error in HBNetctstat.error;stat.maxintnullablee_HBNet? Lower 1{sigma} error in HBNetctstat.errorintnullablefphFBFull 0.5-10 keV band photon flux (2)1e-06cm**-2.s**-1phot.flux;em.X-rayfloatE_fphFB? Upper 1{sigma} error in fphFB1e-06cm**-2.s**-1stat.error;stat.maxfloatnullablee_fphFB? Lower 1{sigma} error in fphFB1e-06cm**-2.s**-1stat.errorfloatnullablefphSBSoft 0.5-2 keV band photon flux (2)1e-06cm**-2.s**-1phot.flux;em.X-rayfloatE_fphSB? Upper 1{sigma} error in fphSB1e-06cm**-2.s**-1stat.error;stat.maxfloatnullablee_fphSB? Lower 1{sigma} error in fphSB1e-06cm**-2.s**-1stat.errorfloatnullablefphHBHard 2-10 keV band photon flux (2)1e-06cm**-2.s**-1phot.flux;em.X-rayfloatE_fphHB? Upper 1{sigma} error in fphHB1e-06cm**-2.s**-1stat.error;stat.maxfloatnullablee_fphHB? Lower 1{sigma} error in fphHB1e-06cm**-2.s**-1stat.errorfloatnullableE50Median source energy (3)keVem.energyfloate_E50The 1{sigma} error in E50keVstat.errorfloatE25Energy below which 25% of total source counts reside (3)keVem.energyfloate_E25The 1{sigma} error in E25keVstat.errorfloatE75Energy below which 75% of total source counts reside (3)keVem.energyfloate_E75The 1{sigma} error in E75keVstat.errorfloatfXFBFull 0.5-10 keV band flux (4)1e-17W.m**-2phot.flux;em.X-rayfloatE_fXFB? Upper 1{sigma} error in fXFB1e-17W.m**-2stat.error;stat.maxfloatnullablee_fXFB? Lower 1{sigma} error in fXFB1e-17W.m**-2stat.errorfloatnullableJ/ApJ/796/105/table5Catalog of Point and Extended Sources: Infrared CounterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNARCS[1/1415] NARCS catalog numbermeta.idintVVVVVV source identifier; if available (Minniti et al. 2010NewA...15..433M)meta.id;meta.maincharRAJ2000? Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainnullableDEJ2000? Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainnullableDelta? Angular separation between Chandra & VVV sourcearcsecpos.angDistancefloatnullablepnoise? Probability VVV source is a noise fluctuationstat.fit.goodnessdoublenullableRel? Reliability (1)meta.code.qualfloatnullable