J/ApJS/194/18ivo://CDS.VizieR/J/ApJS/194/18doi:10.26093/cds/vizier.21940018CDSJonker P.G.Bassa C.G.Nelemans G.Steeghs D.Torres M.A.P.,Maccarone T.J.Hynes R.I.Greiss S.Clem J.Dieball A.Mikles V.J.,Britt C.T.Gossen L.Collazzi A.C.Wijnands R.In't Zand J.J.M.,Mendez M.Rea N.Kuulkers E.Ratti E.M.van Haaften L.M.Heinke C.,Ozel F.Groot P.J.Verbunt F.2018-01-30T07:18:08Z2014-01-14T14:49:47ZCDS support team

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

cds-question@unistra.frx-ray-binary-starssurveysWe introduce the Galactic Bulge Survey (GBS) and we provide the Chandra source list for the region that has been observed to date. Among the goals of the GBS are constraining the neutron star (NS) equation of state and the black hole (BH) mass distribution via the identification of eclipsing NS and BH low-mass X-ray binaries (LMXBs). The GBS targets two strips of 6{deg}x1{deg} (12deg^2^ in total), one above (1{deg}<b<2{deg}) and one below (-2{deg}<b<-1{deg}) the Galactic plane in the direction of the Galactic center at both X-ray and optical wavelengths. By avoiding the Galactic plane (-1{deg}<b<1{deg}) we limit the influence of extinction on the X-ray and optical emission but still sample relatively large number densities of sources. The survey is designed such that a large fraction of the X-ray sources can be identified from their optical spectra. The X-ray survey, by design, covers a large area on the sky while the depth is shallow using 2ks per Chandra pointing. In this way we maximize the predicted number ratio of (quiescent) LMXBs to cataclysmic variables. The survey is approximately homogeneous in depth to a 0.5-10keV flux of 7.7x10^-14^erg/cm^2^/s. So far, we have covered about two-thirds (8.3deg^2^) of the projected survey area with Chandra providing over 1200 unique X-ray sources. We discuss the characteristics and the variability of the brightest of these sources.2011ApJS..194...18Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/194/18CatalogResearchIsServedByTAP VizieR generic serviceIsPreviousVersionOfJ/ApJS/210/18IsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)II/304 : UKIDSS-DR5 (Lawrence+ 2011)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)I/289 : UCAC2 Catalogue (Zacharias+ 2004)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)II/213 : OGLE Galactic Bulge periodic variables (Udalski+ 1996)J/ApJ/685/463 : ChaMPlane X-ray sources in the Galactic bulge (Koenig+, 2008)J/AN/324/437 : H{alpha} emission stars toward Bulge (Kohoutek+, 2003)J/AcA/52/217 : OGLE II. VI photometry of Galactic Bulge (Udalski+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/194/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/194/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/194/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/194/18https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/194/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/194/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/194/18/table3 (The GBS X-ray source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/194/18/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/194/18/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/194/18/table3?GETtext/xml+votable180.050000true267.6018258-29.03788530.0055555555555555565/7212 7213 6/28807 28815 28818 28819 28822 28823 28825 28828 28829 28836 28837 28839 28866 28872 28873 28896 28898 28904https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/194/18?format=asciiOpticaldefaultJ/ApJS/194/18/table3The GBS X-ray source listSeq[1/1234] Source index numbermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCXOGBSSource name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_RAJ2000Error in RAdegarcsecstat.error;pos.eq.rafloatDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_DEJ2000Error in DEdegarcsecstat.error;pos.eq.decfloatTotalNumber of counts detectedctphot.count;em.X-rayintObsIDChandra observation identification numbermeta.id;obs.paramintOAxisOff-axis angle source detectedarcmininstr.offsetfloatNdetNumber of detectionsmeta.numberintHR? Hardness ratio (1)phot.flux;arith.ratiofloatnullablee_HR? Error in HRstat.errorfloatnullable