J/ApJ/780/83ivo://CDS.VizieR/J/ApJ/780/83doi:10.26093/cds/vizier.17800083CDSBarnard R.Garcia M.R.Primini F.Li Z.Baganoff F.K.Murray S.S.2018-05-30T05:30:54Z2015-07-22T07:50:49ZCDS support team

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

cds-question@unistra.frgalaxiesx-ray-sourcesx-ray-binary-starsactive-galactic-nucleiWe have created 0.3-10keV, 13yr, unabsorbed luminosity light curves for 528 X-ray sources in the central 20' of M31. We have 174 Chandra observations spaced at ~1 month intervals due to our transient monitoring program, deeper observations of the M31 nucleus, and some public data from other surveys. We created 0.5-4.5keV structure functions (SFs) for each source for comparison with the ensemble SF of active galactic nuclei (AGN). We find 220 X-ray sources with luminosities >~10^35^erg/s that have SFs with significantly more variability than the ensemble AGN SF, and which are likely X-ray binaries (XBs). A further 30 X-ray sources were identified as XBs using other methods. We therefore have 250 probable XBs in total, including ~200 new identifications. This result represents great progress over the ~50 XBs and ~40 XB candidates previously identified out of the ~2000 X-ray sources within the D_25_ region of M31; it also demonstrates the power of SF analysis for identifying XBs in external galaxies. We also identify a new transient black hole candidate, associated with the M31 globular cluster B128.2014ApJ...780...83Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/780/83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/143 : Revised Bologna Catalog of M31 clusters, V.5 (Galleti+ 2012)J/A+A/536/A84 : X-ray variability of AGN (Vagnetti+, 2011)J/A+A/534/A55 : Deep XMM-Newton Survey of M31 (Stiele+, 2011)J/AJ/141/61 : Star clusters in M31. II. (Caldwell+, 2011)J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)J/A+A/480/599 : XMM-Newton survey of M31 centre field (Stiele+, 2008)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/780/83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/780/83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/780/83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/780/83https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/780/83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/780/83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/780/83/table1 (Summary of our findings for the 528 X-Ray sources in our survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/780/83/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/780/83/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/780/83/table1?GETtext/xml+votable180.050000true10.272541741.30408330.0055555555555555566/2622 2623 2708 2709https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/780/83?format=asciiX-raydefaultJ/ApJ/780/83/table2*Spectral fits for sources with >200 net source counts in at least one ACIS observationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintX-ray[31/512] Sequence number of the sourcemeta.numberintModelEmission model used (PO=POwer law, BB=BlackBody, DBB=Disk BlackBody)instr.setup;meta.modelledcharNH[0.06/0.87] Hydrogen column density (in 10^22^atom/cm^2^) (1)1e+22cm**-2phys.columnDensityfloate_NH[0/0.48]? Uncertainty in NH1e+22cm**-2stat.errorfloatnullableNHchi2[0/77]? NH {chi}^2^ (2)meta.notefloatnullableNHdof[1/104]? NH degrees of freedom (2)stat.fit.dofintnullableParam[0.05/2.88] Parameter from emission model (3)stat.fit.paramfloate_Param[0.001/0.9] Uncertainty in Paramstat.errorfloatPchi2[0/370]? Parameter {chi}^2^ (2)stat.fit.chi2floatnullablePdof[1/104]? Parameter degrees of freedom (2)stat.fit.dofintnullableJ/ApJ/780/83/table1Summary of our findings for the 528 X-Ray sources in our surveychi2[1/61651] Model {chi}^2^stat.param;meta.modelledintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintX-ray[1/528] Running sequence number of the source <[BGP2014] NNN> in Simbadmeta.numberintprimaryRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.maine_RAJ20001{sigma} uncertainty of Right Ascensionarcsecstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.maine_DEJ20001{sigma} uncertainty of Declinationarcsecstat.error;pos.eq.decfloatf_DEJ2000[ab] Positional flag (2)meta.codecharSpmeta.ref.urlcharN1[1/109] Number of ACIS observations (Advanced CCD Imaging Spectrometer)meta.numberintN2[0/63] Number of HRC observations (High Resolution Camera)meta.numberintf_Class1[!] Exclamation mark indicates classification that were rejected for our Chandra locationmeta.codecharClass1Classification assigned by Stiele et al. 2011 (J/A+A/534/A55) (3)src.classcharClass2Improvement on the Stiele et al. 2011 (J/A+A/534/A55) classification (3)src.classcharLX[0/44] Best fit constant luminosity to the unabsorbed 0.3-10keV luminosity light curve (in 10^37^erg/s) (4)1e+30Wphys.luminosity;em.X-rayfloate_LX[0/0.2] Uncertainty in LX1e+30Wstat.errorfloatf_LXFlag on LX (c=HRC observations ignored, d=HRC observations included, e=fitted with blackbody model) (5)meta.codecharDOF[3/170] Degrees of freedomstat.fit.dofintl_Var[>] Lower limit flag on Varmeta.code.errorcharVar[0/320] Ranking of the object according to the variability shown in its structure function (Var=-log10(P_AGN_)) (6)src.var.indexfloatf_Var[fg] Type of X-ray source (f=X-ray binary, g=AGN) (7)meta.codecharS+11Source in the XMM-Newton catalog of Stiele et al. 2011 (cat. J/A+A/534/A55) within 2''meta.ref.urlintnullable