J/ApJ/808/19ivo://CDS.VizieR/J/ApJ/808/19doi:10.26093/cds/vizier.18080019CDSLin D.Irwin J.A.Wong K.-W.Jennings Z.G.Homan J.Romanowsky A.J.,Strader J.Sivakoff G.R.Brodie J.P.Remillard R.A.2017-11-29T11:49:00Z2015-12-16T09:53:03ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsglobular-star-clustersgalaxiesWe carried out an in-depth study of low-mass X-ray binaries (LMXBs) detected in the nearby lenticular galaxy NGC 3115 using the Megasecond Chandra X-ray Visionary Project observation (total exposure time 1.1Ms). In total we found 136 candidate LMXBs in the field and 49 in globular clusters (GCs) above 2{sigma} detection, with 0.3-8keV luminosity L_X_~10^36^-10^39^erg/s. Other than 13 transient candidates, the sources overall have less long-term variability at higher luminosity, at least at L_X_>~2x10^37^erg/s. In order to identify the nature and spectral state of our sources, we compared their collective spectral properties based on single-component models (a simple power law or a multicolor disk) with the spectral evolution seen in representative Galactic LMXBs. We found that in the L_X_ versus photon index {Gamma}_PL_ and L_X_versus disk temperature kT_MCD_ plots, most of our sources fall on a narrow track in which the spectral shape hardens with increasing luminosity below L_X_~7x10^37^erg/s, but is relatively constant ({Gamma}_PL_~1.5 or kT_MCD_~1.5keV) above this luminosity, which is similar to the spectral evolution of Galactic neutron star (NS) LMXBs in the soft state in the Chandra bandpass. Therefore, we identified the track as the NS LMXB soft-state track and suggested sources with L_X_<~7x10^37^erg/s as atolls in the soft state and those with L_X_>~7x10^37^erg/s as Z sources. Ten other sources (five are transients) displayed significantly softer spectra and are probably black hole X-ray binaries in the thermal state. One of them (persistent) is in a metal-poor GC.2015ApJ...808...19Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/808/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)B/hst : HST Archived Exposures Catalog (STScI, 2007)IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)J/ApJ/766/88 : Chandra obs. of X-ray binaries in Cen A (Burke+, 2013)J/MNRAS/428/389 : SLUGGS globular clusters in early-type galaxies (Pota+, 2013)J/ApJ/756/27 : Class. of sources from the 2XMMi-DR3 cat. (Lin+, 2012)J/ApJS/179/360 : Thermonuclear X-ray bursts observed by RXTE (Galloway+, 2008)J/ApJS/169/401 : ChaMP X-ray point source catalog (Kim+, 2007)J/ApJ/586/814 : NGC 4472 Chandra/HST study (Maccarone+, 2003)J/other/NewA/5.137 : Supersoft X-ray sources catalog (Greiner+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/808/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/808/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/808/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/808/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/808/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/808/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/808/19/table3 (The Master Source Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/808/19/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/808/19/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/808/19/table3?GETtext/xml+votable180.050000true151.30736194-7.737903060.0055555555555555566/26802 26803 26808 26809https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/808/19?format=asciidefaultJ/ApJ/808/19/table3The Master Source CatalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSID[1/482] The master source unique indexmeta.id;meta.mainintprimaryNobsNumber of individual observations for this sourcemeta.numberintnullableCXOUCXOU Name (JHHMMSS.s+DDMMSS)meta.idcharRAJ2000Right Ascension in decimal degrees (J2000; ICRS)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000; ICRS)degpos.eq.dec;meta.mainPU[0.03/8] The 1{sigma} statistical positional uncertainty in each coordinatearcsecstat.errorfloatSep[0.003/22] Angular separation from galaxy centerarcminpos.angDistancefloatSepRRatio of angular separation to D25 isophote elliptical radiuspos.angDistancefloatpsf50The 50% PSF radius at the source position in merged observationarcsecphys.angSizefloatpsf90The 90% PSF radius at the source position in merged observationarcsecphys.angSizefloatObsIDObservation ID in which the source is detected; 0 for the merged observationmeta.id;obsintSNR[2/95.2] Signal-to-noise ratio (1)stat.snrfloatVvar[1/127] Flux variation factor in 0.5-7keV bandsrc.var.amplitudefloatSvar[1/46] Significance of flux variation; equation 1stat.fit.goodnessfloatLmaxMaximum 0.5-7keV luminosity (2)1e-07Wphys.luminositydoubleb_LmaxLower limit on Lmax at 68% confidence level (2)1e-07Wphys.luminosity;stat.mindoubleB_LmaxUpper limit of Lmax at 68% confidence level (2)1e-07Wphys.luminosity;stat.maxdoubleOLmaxCorresponding observation ID of Lmaxmeta.id;obscharLminMinimum 0.5-7 keV luminosity (2)1e-07Wphys.luminosity;em.X-raydoubleb_LminLower limit on Lmin at 68% confidence level (2)1e-07Wphys.luminosity;em.X-ray;stat.mindoubleB_LminUpper limit of Lmin at 68% confidence level (2)1e-07Wphys.luminosity;em.X-ray;stat.maxdoubleOLminCorresponding observation ID of Lminmeta.id;obscharGLmaxMaximum Gregory-Loredo short-term variability index (6-10 = variable) (3)meta.code;src.var.index;stat.maxintTypeSource type (4)src.classcharP13Display data from Pota+, 2013, J/MNRAS/428/389, within 3"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/808/19/table4The source counts, flux, and hardness ratio in the merged observation for the 482 master sourcerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSID[1/482] The master source unique indexmeta.id;meta.mainintObsObservation (G1)meta.code;obscharExp[35/1131] Exposure timekstime.duration;obs.exposurefloatCbCounts in the broad band; 0.5-7.0keVphot.count;em.X-rayfloatb_CbLower limit of Cb at 68% confidence levelmeta.notefloatB_CbUpper limit of Cb at 68% confidence levelmeta.notefloatFbFlux in the broad band; 0.5-7.0keV (2)mW.m**-2phot.fluxdoubleb_FbLower limit of Fb at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FbUpper limit of Fb at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleCuCounts in the ultra-soft band; 0.2-0.5keVphot.count;em.X-rayfloatb_CuLower limit of Cu at 68% confidence levelmeta.notefloatB_CuUpper limit of Cu at 68% confidence levelmeta.notefloatFuFlux in the ultra-soft band; 0.2-0.5keV (2)mW.m**-2phot.fluxdoubleb_FuLower limit of Fu at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FuUpper limit of Fu at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleCsCounts in the soft band; 0.5-1.2keVphot.count;em.X-rayfloatb_CsLower limit of Cs at 68% confidence levelmeta.notefloatB_CsUpper limit of Cs at 68% confidence levelmeta.notefloatFsFlux in the soft band; 0.5-1.2keV (2)mW.m**-2phot.flux;em.X-raydoubleb_FsLower limit of Fs at 68% confidence levelmW.m**-2phot.flux;em.X-ray;stat.mindoubleB_FsUpper limit of Fs at 68% confidence levelmW.m**-2phot.flux;em.X-ray;stat.maxdoubleCmCounts in the medium band; 1.2-2.0keVphot.count;em.X-rayfloatb_CmLower limit of Cm at 68% confidence levelmeta.notefloatB_CmUpper limit of Cm at 68% confidence levelmeta.notefloatFmFlux in the medium band; 1.2-2.0keV (2)mW.m**-2phot.fluxdoubleb_FmLower limit of Fm at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FmUpper limit of Fm at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleChCounts in the hard band; 2.0-7.0keVphot.count;em.X-rayfloatb_ChLower limit of Ch at 68% confidence levelmeta.notefloatB_ChUpper limit of Ch at 68% confidence levelmeta.notefloatFhFlux in the hard band; 2.0-7.0keV (2)mW.m**-2phot.flux;em.X-ray.harddoubleb_FhLower limit of Fh at 68% confidence levelmW.m**-2phot.flux;em.X-ray.hard;stat.mindoubleB_FhUpper limit of Fh at 68% confidence levelmW.m**-2phot.flux;em.X-ray.hard;stat.maxdoubleHR1? Hardness Ratio using the 0.5-1.2keV and the 1.2-2.0 keV fluxes (3)phot.flux;em.X-ray.soft;arith.ratiofloatnullablebHR1? Lower limit of HR1 at 68% confidence levelstat.errorfloatnullableBHR1? Upper limit of HR1 at 68% confidence levelstat.errorfloatnullableHR2Hardness Ratio using the 1.2-2.0keV and the 2.0-7.0 keV fluxes (3)phot.flux;em.X-ray.soft;arith.ratiofloatbHR2Lower limit of HR2 at 68% confidence levelstat.errorfloatBHR2Upper limit of HR2 at 68% confidence levelstat.errorfloatHR3Hardness Ratio using the 0.5-2.0keV and the 2.0-7.0 keV fluxes (3)phot.flux;arith.ratiofloatbHR3Lower limit of HR3 at 68% confidence levelstat.errorfloatBHR3Upper limit of HR3 at 68% confidence levelstat.errorfloatJ/ApJ/808/19/table5The source counts and flux in individual observations for the 482 master sourcesCbCounts in the broad band; 0.5-7.0keVphot.count;em.X-rayfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSID[1/482] The master source unique indexmeta.id;meta.mainintObsIDThe observation IDmeta.id;obsintb_CbLower limit of Cb at 68% confidence levelmeta.notefloatB_CbUpper limit of Cb at 68% confidence levelmeta.notefloatFbFlux in the broad band; 0.5-7.0keV (1)mW.m**-2phot.fluxdoubleb_FbLower limit of Fb at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FbUpper limit of Fb at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleCuCounts in the ultra-soft band; 0.2-0.5keVphot.count;em.X-rayfloatb_CuLower limit of Cu at 68% confidence levelmeta.notefloatB_CuUpper limit of Cu at 68% confidence levelmeta.notefloatFuFlux in the ultra-soft band; 0.2-0.5keV (1)mW.m**-2phot.fluxdoubleb_FuLower limit of Fu at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FuUpper limit of Fu at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleCsCounts in the soft band; 0.5-1.2keVphot.count;em.X-rayfloatb_CsLower limit of Cs at 68% confidence levelmeta.notefloatB_CsUpper limit of Cs at 68% confidence levelmeta.notefloatFsFlux in the soft band; 0.5-1.2keV (1)mW.m**-2phot.flux;em.X-raydoubleb_FsLower limit of Fs at 68% confidence levelmW.m**-2phot.flux;em.X-ray;stat.mindoubleB_FsUpper limit of Fs at 68% confidence levelmW.m**-2phot.flux;em.X-ray;stat.maxdoubleCmCounts in the medium band; 1.2-2.0keVphot.count;em.X-rayfloatb_CmLower limit of Cm at 68% confidence levelmeta.notefloatB_CmUpper limit of Cm at 68% confidence levelmeta.notefloatFmFlux in the medium band; 1.2-2.0keV (1)mW.m**-2phot.fluxdoubleb_FmLower limit of Fm at 68% confidence levelmW.m**-2phot.flux;stat.mindoubleB_FmUpper limit of Fm at 68% confidence levelmW.m**-2phot.flux;stat.maxdoubleChCounts in the hard band; 2.0-7.0keVphot.count;em.X-rayfloatb_ChLower limit of Ch at 68% confidence levelmeta.notefloatB_ChUpper limit of Ch at 68% confidence levelmeta.notefloatFhFlux in the hard band; 2.0-7.0keV (1)mW.m**-2phot.flux;em.X-ray.harddoubleb_FhLower limit of Fh at 68% confidence levelmW.m**-2phot.flux;em.X-ray.hard;stat.mindoubleB_FhUpper limit of Fh at 68% confidence levelmW.m**-2phot.flux;em.X-ray.hard;stat.maxdoubleJ/ApJ/808/19/table6*Spectral fit resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSID[1/481] Master source unique indexmeta.id;meta.mainintObsObservation (G1)meta.code;obscharNH-PLIntrinsic column density from PL fit1e+20cm**-2phys.columnDensityfloate_NH-PL? Lower uncertainty on NH at 90% confidence level1e+20cm**-2stat.errorfloatnullableE_NH-PL? Upper uncertainty on NH at 90% confidence level1e+20cm**-2stat.error;stat.maxfloatnullableGamma-PLPhoton indexspect.indexfloate_Gamma-PLLower uncertainty on Gamma_PL at 90% confidence levelstat.errorfloatE_Gamma-PLUpper uncertainty on Gamma_PL at 90% confidence levelstat.error;stat.maxfloatN-PLNormalization of the PL fitstat.fit.paramfloate_N-PLLower uncertainty on N-PL at 90% confidence levelstat.errorfloatE_N-PLUpper uncertainty on N-PL at 90% confidence levelstat.error;stat.maxfloatL-PLLuminosity in 0.3-8.0keV from PL fit (2)1e+30Wphys.luminosity;em.X-rayfloate_L-PLLower uncertainty on L-PL at 90% confidence level (2)1e+30Wstat.errorfloatE_L-PLUpper uncertainty on L-PL at 90% confidence level (2)1e+30Wstat.error;stat.maxfloatNH-MCDIntrinsic column density from MCD fit1e+20cm**-2phys.columnDensityfloate_NH-MCD? Lower uncertainty on NH-MCD at 90% confidence level1e+20cm**-2stat.errorfloatnullableE_NH-MCD? Upper uncertainty on NH-MCD at 90% confidence level1e+20cm**-2stat.error;stat.maxfloatnullablekT-MCDMCD fit apparent inner disk temperaturekeVphys.temperaturefloate_kT-MCDLower uncertainty on kT-MCD at 90% confidence levelkeVstat.errorfloatE_kT-MCDUpper uncertainty on kT-MCD at 90% confidence levelkeVstat.error;stat.maxfloatR-MCDApparent inner disk radius from MCD fit (3)kmphys.size.radiusdoublee_R-MCDLower uncertainty on R-MCD at 90% confidence levelkmstat.errordoubleE_R-MCDUpper uncertainty on R-MCD at 90% confidence levelkmstat.error;stat.maxdoubleL-MCDLuminosity in 0.3-8.0keV from MCD fit (2)1e+30Wphys.luminosity;em.X-rayfloate_L-MCDLower uncertainty on L-MCD at 90% confidence level (2)1e+30Wstat.errorfloatE_L-MCDUpper uncertainty on L-MCD at 90% confidence level (2)1e+30Wstat.error;stat.maxfloatJ/ApJ/808/19/table2The globular cluster LMXBs and candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeObject type (1)src.classcharMSID[4/451] The master source unique indexmeta.id;meta.mainintGCGC in Jennings et al. (2014, J/AJ/148/32; <[JSR2014] ANNN> in Simbad)meta.id.crosschardXO[0.01/1] The offset between the GC center and our X-ray sourcearcsecpos.angDistance;arith.difffloatgmag[19.9/24.4]? HST/ACS g-band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag[0.002/0.07]? gmag uncertaintymagstat.error;phot.mag;em.opt.Bfloatnullablezmag[18.7/23.2]? HST/ACS z-band magnitudemagphot.mag;em.opt.Ifloatnullablee_zmag[0.002/0.07]? zmag uncertaintymagstat.error;phot.mag;em.opt.IfloatnullablegSmag[19.5/24.6]? Subaru/Suprime-Cam g-band magnitudemagphot.mag;em.opt.Bfloatnullablee_gSmag[0.003/0.3]? gSCmag uncertaintymagstat.error;phot.magfloatnullablerSmag[18.8/23.6]? Subaru/Suprime-Cam r-band magnitudemagphot.mag;em.opt.Rfloatnullablee_rSmag[0.003/0.2]? rSCmag uncertaintymagstat.error;phot.magfloatnullableiSmag[18.4/23.6]? Subaru/Suprime-Cam i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_iSmag[0.003/0.3]? iSCmag uncertaintymagstat.error;phot.magfloatnullableRh[0.2/4.8]? Half-light radiuspcphys.size.radiusfloatnullableVel[238/1123]? Heliocentric velocity from Pota et al. (2013, J/MNRAS/428/389)km/sspect.dopplerVeloc;pos.heliocentricintnullable