J/MNRAS/461/3443ivo://CDS.VizieR/J/MNRAS/461/3443doi:10.26093/cds/vizier.74613443CDSVulic N.Gallagher S.C.Barmby P.2024-08-16T20:17:54Z2018-03-14T15:46:05ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsx-ray-sourcesThis study represents the most sensitive Chandra X-ray point source catalogue of M31. Using 133 publicly available Chandra ACIS-I/S observations totalling ~1Ms, we detected 795 X-ray sources in the bulge, north-east, and south-west fields of M31, covering an area of ~=0.6deg^2^, to a limiting unabsorbed 0.5-8.0keV luminosity of ~10^34^erg/s. In the inner bulge, where exposure is approximately constant, X-ray fluxes represent average values because they were determined from many observations over a long period of time. Similarly, our catalogue is more complete in the bulge fields since monitoring allowed more transient sources to be detected. The catalogue was cross-correlated with a previous XMM-Newton catalogue of M31's D_25_ isophote consisting of 1948 X-ray sources, with only 979 within the field of view of our survey. We found 387 (49 per cent) of our Chandra sources (352 or 44 per cent unique sources) matched to within 5 arcsec of 352 XMM-Newton sources. Combining this result with matching done to previous Chandra X-ray sources we detected 259. new sources in our catalogue. We created X-ray luminosity functions (XLFs) in the soft (0.5-2.0keV) and hard (2.0-8.0keV) bands that are the most sensitive for any large galaxy based on our detection limits. Completeness-corrected XLFs show a break around ~=1.3x10^37^erg/s, consistent with previous work. As in past surveys, we find that the bulge XLFs are flatter than the disc, indicating a lack of bright high-mass X-ray binaries in the disc and an aging population of low-mass X-ray binaries in the bulge.2016MNRAS.461.3443Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/461/3443CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/577/738 : M31 Chandra X-ray point sources (Kong+, 2002)J/ApJ/578/114 : Chandra HRC source in M31 (Kaaret, 2002)J/ApJ/609/735 : M31 Chandra X-ray sources (Williams+, 2004)J/ApJ/610/247 : M31 supersoft & quasi-soft X-ray sources (Di Stefano+, 2004)J/A+A/468/49 : LMXBs in the bulge of M31 (Voss+, 2007)J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)J/A+A/534/A55 : Deep XMM-Newton Survey of M31 (Stiele+, 2011)J/A+A/555/A65 : X-ray variability of M31 central field (Hofmann+, 2013)J/ApJ/780/83 : X-ray binaries observed in M31 with Chandra (Barnard+, 2014)J/ApJ/802/127 : PHAT stellar cluster survey. II. AP catalog (Johnson+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/461/3443https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/461/3443http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/461/3443https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/461/3443https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/461/3443http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/461/3443GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/461/3443/table3 (ACIS-S observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/3443/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/3443/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/3443/table3?GETtext/xml+votable180.050000true10.68841.278770.005555555555555556Cone search capability for table J/MNRAS/461/3443/table4 (ACIS-I observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/3443/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/3443/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/3443/table4?GETtext/xml+votable180.050000true10.6780641.269890.005555555555555556Cone search capability for table J/MNRAS/461/3443/table5 (M31 source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/3443/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/3443/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/3443/table5?GETtext/xml+votable180.050000true11.4287788941.720188890.0055555555555555566/2622-2623 2666 2705 2708-2709https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/461/3443?format=asciiX-raydefaultJ/MNRAS/461/3443/table3ACIS-S observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDObsIDmeta.noteintDateObservation datetime.epoch;obsnullableRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declinatin (J2000) (1)degpos.eq.dec;meta.mainDistDistance from the centre of M31 (J004244.33+411607.50)arcminpos.angDistancefloatLivetimeLivetime (2)kstime.duration;obs.exposureintDatamodeDatamodemeta.id;instrcharCCDsCCD chips that were on during the observation (3)meta.id;instrcharRAngleRoll Angledeginstr.offsetRegRegion of the ACIS-S in Fig. 1 (4)obs.fieldcharDx{delta}x (5)pixstat.errordoubleDy{delta}y (5)pixstat.errordoubleRotRotation (5)degphysdoubleScaleScale Factor (5)arith.factordoubleMatchMatched Sources (5)meta.codeintCatCatalogue (5)meta.id;meta.maincharJ/MNRAS/461/3443/table4ACIS-I observationsObsIDObsIDmeta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epoch;obsnullableRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declinatin (J2000) (1)degpos.eq.dec;meta.mainDistDistance from the centre of M31 (J004244.33+411607.50)arcminpos.angDistancefloatLivetimeLivetime (2)kstime.duration;obs.exposureintDatamodeDatamodemeta.id;instrcharCCDsCCD chips that were on during the observation (3)meta.id;instrcharRAngleRoll Angledeginstr.offsetRegRegion of the ACIS-S in Fig. 1 (4)obs.fieldcharDx{delta}x (5)pixstat.errordoubleDy{delta}y (5)pixstat.errordoubleRotRotation (5)degphysdoubleScaleScale Factor (5)arith.factordoubleMatchMatched Sources (5)meta.codeintCatCatalogue (5)meta.id;meta.maincharJ/MNRAS/461/3443/table5M31 source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource sequential numbermeta.recordintCXOUCXOU J name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainDistDistance from the centre of M31 (J004244.33+411607.50)arcminpos.angDistancefloatePosPositional uncertainty (1)arcsecstat.error;posfloatthetaAverage off-axis angle for merged observationsarcmininstr.offset;stat.meanfloatNobsNumber of observations extractedmeta.numberintDetDetector in which the source was detected, ACIS-I, ACIS-S, or Bothmeta.idcharRegRegion for a source detected in ACIS-S or Bothobs.fieldcharTexpTotal exposure time for merged observationskstime.duration;obs.exposureintTexpMapTotat exposure map for merged observationss.cm**2obs.paramdoubleRsrcAverage radius of the source extraction region (in sky pixel = 0.492")pixphys.angSize;obs.field;stat.meanfloatSNRPhotometric significance (net counts / upper error on net counts) (0.3-8.0keV)stat.snrfloatEmedBackground-corrected median photon energy (0.3-8.0keV)keVem.energyfloatMatchCross-match results from Section 3.4: active galactic nuclei (AGN) or low-mass X-ray binary (LMXB)meta.codecharJ/MNRAS/461/3443/table6Additional M31 source propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource sequential numbermeta.recordintpnsTPoisson probability of a detection not being a source in total band (0.5-8.0keV)stat.fit.goodnessdoublepnsSPoisson probability of a detection not being a source in soft band (0.5-2.0keV)stat.fit.goodnessdoublepnsHPoisson probability of a detection not being a source in hard band (2.0-8.0keV)stat.fit.goodnessdoubleNCTNet counts in total band (0.5-8.0keV)ctphot.count;em.X-raydoubleE_NCTError in NCT (90% upper value)ctstat.error;stat.maxfloate_NCTError in NCT (90% lower value)ctstat.errorfloatNCSNet counts in soft band (0.5-2.0keV)ctphot.count;em.X-raydoubleE_NCSError in NCS (90% upper value)ctstat.error;stat.maxfloate_NCS? Error in NCS (90% lower value)ctstat.errorfloatnullableNCHNet counts in hard band (2.0-8.0keV)ctphot.count;em.X-raydoubleE_NCHError in NCH (90% upper value)ctstat.error;stat.maxfloate_NCH? Error in NCH (90% lower value)ctstat.errorfloatnullableFluxTFlux in total band (0.5-8.0keV) (1)mW.m**-2phot.flux;em.X-raydoubleFluxH? Flux in soft band (0.5-2.0keV) (1)mW.m**-2phot.flux;em.X-raydoublenullableFluxS? Flux in hard band (2.0-8.0keV) (1)mW.m**-2phot.flux;em.X-raydoublenullableFluxTSumSummed flux in total band (0.5-8.0keV)mW.m**-2phot.flux;em.X-raydoubleFluxSSumSummed flux in soft band (0.5-2.0keV)mW.m**-2phot.flux;em.X-raydoubleFluxHSumSummed flux in hard band (2.0-8.0keV)mW.m**-2phot.flux;em.X-raydoubleJ/MNRAS/461/3443/table8X-ray catalogue cross-matchesAGN3NED if AGN in NEDmeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource sequential numbermeta.recordintCXOUCXOU J name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharXMMID? XMM identification numbermeta.idintnullableXMMClassXMM classificationsrc.classcharChandraCatChandra catalog (1)meta.id;meta.tablecharChandraIDIdentification in Chandra catalogmeta.idcharLMXB1Peacock et al. (2010, Cat. J/MNRAS/402/803) globular clusters IDmeta.idcharLMXB2? Stiele et al. (2011, Cat. J/A+A/534/A55) field IDmeta.idintnullableLMXB3? Stiele et al. (2011, Cat. J/A+A/534/A55) globular clusters IDmeta.idintnullableAGN1? PHAT AGN matching with Andromeda project identification number from Johnson et al., 2015, Cat. J/ApJ/802/127, [JSD2015] AA NNNNN in Simbadmeta.idintnullableAGN2DR12 if AGN in SDSS DR12meta.codecharAGN4SIMBAD if AGN in Simbadmeta.codechar