J/ApJ/706/223ivo://CDS.VizieR/J/ApJ/706/223doi:10.26093/cds/vizier.17060223CDSHong J.van den Berg M.Grindlay J.E.Laycock S.2026-05-19T14:25:37Z2012-01-09T07:50:58ZCDS support team

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

cds-question@unistra.frx-ray-sourcessurveysWe present the log N-logS and spatial distributions of X-ray point sources in seven Galactic bulge (GB) fields within 4{deg} from the Galactic center (GC). We compare the properties of 1159 X-ray point sources discovered in our deep (100ks) Chandra observations of three low extinction Window fields near the GC with the X-ray sources in the other GB fields centered around Sgr B2, Sgr C, the Arches Cluster, and Sgr A* using Chandra archival data. To reduce the systematic errors induced by the uncertain X-ray spectra of the sources coupled with field-and-distance-dependent extinction, we classify the X-ray sources using quantile analysis and estimate their fluxes accordingly. We also compare the total X-ray and infrared surface brightness using the Chandra and Spitzer observations of the regions. GB X-ray sources can be of the same or similar type. Their X-ray luminosity and spectral properties support the idea that the most likely candidate is magnetic cataclysmic variables (CVs), primarily intermediate polars (IPs).2009ApJ...706..223Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/706/223CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)J/ApJS/194/18 : The Galactic Bulge Survey: X-ray observations (Jonker+, 2011)J/ApJ/700/1702 : ChaMPlane deep galactic bulge survey. I. (van den Berg+, 2009)J/ApJ/703/30 : NIR counterparts to Chandra X-ray sources. I. (Mauerhan+,J/ApJ/685/463 : ChaMPlane X-ray sources in the Galactic bulge (Koenig+, 2008)J/ApJ/685/958 : Spitzer and Chandra sources in galactic center (Arendt+ 2008)J/MNRAS/371/38 : X-ray observations of the Galaxy center (Wang+, 2006)J/ApJ/613/1179 : X-ray sources in Galactic Center (Muno+, 2004)J/ApJ/589/225 : Chandra X-ray sources toward Galactic Center (Feigelson+,http://hea-www.harvard.edu/ChaMPlane/ : ChaMPlane home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/706/223https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/706/223http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/706/223https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/706/223https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/706/223http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/706/223GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/706/223/table2 (Catalog of X-ray point sources in the Window and four Galactic bulge (GB) fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/706/223/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/706/223/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/706/223/table2?GETtext/xml+votable180.050000true270.62693389-29.946496940.005555555555555556Cone search capability for table J/ApJ/706/223/table1 (Selected Galactic Bulge (GB) fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/706/223/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/706/223/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/706/223/table1?GETtext/xml+votable180.050000true270.8157-29.95650.0055555555555555566/28778 28821-28823 28827 28830-28831https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/706/223?format=asciiX-raydefaultJ/ApJ/706/223/table2Catalog of X-ray point sources in the Window and four Galactic bulge (GB) fieldse_E50Error in E50keVstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCXOPSSource Name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharFieldField Name (see table 1)obs.fieldcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainePosPositional Error (95%)arcsecstat.error;posfloatOffsetOffset from the aimpointarcminpos.angDistancefloatnetBxNet counts in the 0.3-8.0keV (full) bandctphot.count;em.X-raydoublee_netBxStatistical error in netBXctstat.errordoublenetScNet counts in the 0.5-2.0keV (soft) bandctphot.count;em.X-raydoublee_netScStatistical error in netScctstat.errordoublenetHcNet counts in the 2.0-8.0keV (hard) bandctphot.count;em.X-raydoublee_netHcStatistical error in netHcctstat.errordoubleSNRHcSignal-to-Noise in the 2.0-8.0keV bandstat.snrfloatE50Median energykeVem.energyfloatQDyy-value of the Quantile Diagram (1)stat.fit.paramfloate_QDyNegative error of QDystat.errorfloatE_QDyPositve error of QDystat.error;stat.maxfloatGx[1,3] X-ray group ID (soft, medium, hard) (2)meta.idintuFHcunabsorbed flux in the 2.0-8.0keV bandmW.m**-2phot.flux;em.X-raydoublee_uFHcError in uFHcmW.m**-2stat.errordoubleJ/ApJ/706/223/table1Selected Galactic Bulge (GB) fieldsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField namemeta.id;meta.maincharprimaryn_Field[e] stacked pointings (1)meta.notecharObsIDChandra obsIDmeta.notecharGLON? Galactic longitude in decimal degreesdegpos.galactic.lonnullableGLAT? Galactic latitude in decimal degreesdegpos.galactic.latnullableOffset? Aim point offset from Sgr A*degpos.angDistancefloatnullableN(H)? Neutral hydrogen column density (2)1e+22cm**-2phys.columnDensityfloatnullableGTIThe good time intervals (GTIs) (3)kstime.epochintBxCtNumber of sources with net count>=1 in band 0.3-8keV (4)meta.numberintSxCtNumber of sources with net count>=1 in band 0.3-2.5keV (4)meta.numberintHxctNumber of sources with net count>=1 in band 2.5-8keV (4)phot.count;em.X-rayintCombCombined unique source count (4)meta.numberint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ra;meta.mainnullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.dec;meta.mainnullableindexed