J/ApJS/204/14ivo://CDS.VizieR/J/ApJS/204/14doi:10.26093/cds/vizier.22040014CDSLuo B.Fabbiano G.Strader J.Kim D.-W.Brodie J.P.Fragos T.,Gallagher J.S.King A.Zezas A.2017-07-12T15:02:48Z2013-04-25T10:46:11ZCDS support team

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

cds-question@unistra.frgalaxiesx-ray-sourcesactive-galactic-nucleix-ray-binary-starsglobular-star-clustersWe present the X-ray source catalog for the Chandra monitoring observations of the elliptical galaxy, NGC 4649 (M60). The galaxy has been observed with Chandra ACIS-S3 in six separate pointings, reaching a total exposure of 299ks. There are 501 X-ray sources detected in the 0.3-8.0keV band in the merged observation or in one of the six individual observations; 399 sources are located within the D_25_ ellipse. The observed 0.3-8.0keV luminosities of these 501 sources range from 9.3x10^36^erg/s to 5.4x10^39^erg/s. The 90% detection completeness limit within the D_25_ ellipse is 5.5x10^37^erg/s. Based on the surface density of background active galactic nuclei (AGNs) and detection completeness, we expect ~45 background AGNs among the catalog sources (~15 within the D_25_ ellipse). There are nine sources with luminosities greater than 10^39^erg/s, which are candidates for ultraluminous X-ray sources. The nuclear source of NGC 4649 is a low-luminosity AGN, with an intrinsic 2.0-8.0keV X-ray luminosity of 1.5x10^38^erg/s. The X-ray colors suggest that the majority of the catalog sources are low-mass X-ray binaries (LMXBs). We find that 164 of the 501 X-ray sources show long-term variability, indicating that they are accreting compact objects. We discover four transient candidates and another four potential transients. We also identify 173 X-ray sources (141 within the D_25_ ellipse) that are associated with globular clusters (GCs) based on Hubble Space Telescope and ground-based data; these LMXBs tend to be hosted by red GCs. Although NGC 4649 has a much larger population of X-ray sources than the structurally similar early-type galaxies, NGC 3379 and NGC 4278, the X-ray source properties are comparable in all three systems.2013ApJS..204...14Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/204/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2013)J/MNRAS/416/155 : Globular clusters in five early-type galaxies (Faifer+, 2011)J/A+A/525/A19 : Phot. of globulars in early galaxies (Chies-Santos+, 2011)J/ApJ/736/65 : PNe in the Virgo elliptical gal. NGC 4649 (Teodorescu+, 2011)J/ApJS/192/10 : Chandra ACIS survey in 383 nearby galaxies. I. (Liu, 2011)J/ApJ/690/512 : LMXBs & globulars in early-type galaxies. II. (Humphrey, 2009)J/ApJ/689/983 : LMXBs in early-type galaxies. I. Chandra (Humphrey+, 2008)J/ApJ/682/135 : CCD photometry of M60 (Lee+, 2008)J/ApJ/674/857 : RVs and CT1 magnitudes in M60 galaxy (Lee+, 2008)J/ApJS/171/101 : GCs in the ACS Virgo cluster survey (Jordan+, 2007)J/ApJ/662/525 : LMXBs in globular clusters of 5 galaxies (Kundu+, 2007)J/ApJ/636/200 : XMM-Newton LMXB in NGC4649 (Randall+, 2006)J/ApJS/157/59 : Ultraluminous X-ray sources in nearby galaxies (Liu+, 2005)J/ApJ/602/231 : Chandra X-ray point sources in nearby gal. (Colbert+, 2004)J/ApJ/600/729 : Chandra LMXB in NGC 4649 (Randall+, 2004)J/MNRAS/355/608 : NGC 4649 (M60) globular clusters (Forbes+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/204/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/204/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/204/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/204/14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/204/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/204/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/204/14/catalog (Main Chandra catalog: basic and merged observations parameters (tables 3 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/204/14/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/204/14/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/204/14/catalog?GETtext/xml+votable180.050000true190.835083311.50763890.0055555555555555566/27907https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/204/14?format=asciiX-raydefaultJ/ApJS/204/14/measuresSource counts, hardness ratios, colors for individual observations (tables 5--10)E_HC? Upper 1{sigma} uncertainty on HCstat.error;stat.maxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDChandra observation identificationmeta.id;obsintnullableXID[1/501] Source identification numbermeta.idintFB? Net full band 0.3-8 keV countsctphot.count;em.X-rayfloatnullablee_FB? Lower 1{sigma} uncertainty on FB (6)ctstat.errorfloatnullableE_FB? Upper 1{sigma} uncertainty on FB (6)ctstat.error;stat.maxfloatnullableSB? Net soft band 0.3-2 keV countsctphot.count;em.X-rayfloatnullablee_SB? Lower 1{sigma} uncertainty on SB (6)ctstat.errorfloatnullableE_SB? Upper 1{sigma} uncertainty on SB (6)ctstat.error;stat.maxfloatnullableHB? Net hard band 2-8 keV countsctphot.count;em.X-rayfloatnullablee_HB? Lower 1{sigma} uncertainty on HB (6)ctstat.errorfloatnullableE_HB? Upper 1{sigma} uncertainty on HB (6)ctstat.error;stat.maxfloatnullableSB1? Net 0.3-1 keV countsctphot.count;em.X-rayfloatnullablee_SB1? Lower 1{sigma} uncertainty on SB1 (6)ctstat.errorfloatnullableE_SB1? Upper 1{sigma} uncertainty on SB1 (6)ctstat.error;stat.maxfloatnullableSB2? Net 1-2 keV countsctphot.count;em.X-rayfloatnullablee_SB2? Lower 1{sigma} uncertainty on SB2 (6)ctstat.errorfloatnullableE_SB2? Upper 1{sigma} uncertainty on SB2 (6)ctstat.error;stat.maxfloatnullableHR? Hardness ratio; (HB-SB)/(HB+SB)phot.fluxfloatnullablee_HR? Lower 1{sigma} uncertainty on HRstat.errorfloatnullableE_HR? Upper 1{sigma} uncertainty on HRstat.error;stat.maxfloatnullableSC? Soft X-ray color; (SB2-SB1)/FBphot.flux;arith.ratiofloatnullablee_SC? Lower 1{sigma} uncertainty on SCstat.errorfloatnullableE_SC? Upper 1{sigma} uncertainty on SCstat.error;stat.maxfloatnullableHC? Hard X-ray color; (HB-SB2)/FBphot.flux;arith.ratiofloatnullablee_HC? Lower 1{sigma} uncertainty on HCstat.errorfloatnullablel_logLXThe 3{sigma} upper limit on logLXmeta.code.errorcharlogLX[36.9/40]? log of 0.3-8keV X-ray luminosity; (in erg/s)log(1e-07W)phys.luminosity;em.X-rayfloatnullableJ/ApJS/204/14/catalogMain Chandra catalog: basic and merged observations parameters (tables 3 and 4)SB1? Net 0.3-1 keV countsctphot.count;em.X-rayfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXID[1/501] Source identification numbermeta.idintprimaryCXOUIAU name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000[12] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[11] Degree of Declination (J2000)pos.eq.dec;meta.mainDist[0/7.16] Radial distance of source from nucleusarcminphys.angSizefloatepos[0.1/3.9] Positional uncertaintyarcsecstat.error;posfloatl_logLXThe 3{sigma} upper limit on logLXmeta.code.errorcharlogLX[36.9/39.8] log of 0.3-8keV X-ray luminosity; in erg/slog(1e-07W)phys.luminosity;em.X-rayfloatVar[ VNPTC] Variability flag (1)meta.code;src.varcharsigni[0/14.4]? Maximum statistical significance (2)stat.maxfloatnullablefp[0/3]? Positional flag: 0=outside, 3=inside (3)meta.codeintnullableO[0/9]? Optical association note (4)meta.codeintnullableGCGlobular Cluster identifier (5)meta.id.assoccharXmCross-match within 2" with Humphrey & Buote, 2008, Cat. J/ApJ/689/983 and Jordan et al. 2009, Cat. J/ApJS/180/54meta.ref.urlintnullableFB? Net full band 0.3-8 keV countsctphot.count;em.X-rayfloatnullablee_FB? Lower 1{sigma} uncertainty on FB (6)ctstat.errorfloatnullableE_FB? Upper 1{sigma} uncertainty on FB (6)ctstat.error;stat.maxfloatnullableSB? Net soft band 0.3-2 keV countsctphot.count;em.X-rayfloatnullablee_SB? Lower 1{sigma} uncertainty on SB (6)ctstat.errorfloatnullableE_SB? Upper 1{sigma} uncertainty on SB (6)ctstat.error;stat.maxfloatnullableHB? Net hard band 2-8 keV countsctphot.count;em.X-rayfloatnullablee_HB? Lower 1{sigma} uncertainty on HB (6)ctstat.errorfloatnullableE_HB? Upper 1{sigma} uncertainty on HB (6)ctstat.error;stat.maxfloatnullablee_SB1? Lower 1{sigma} uncertainty on SB1 (6)ctstat.errorfloatnullableE_SB1? Upper 1{sigma} uncertainty on SB1 (6)ctstat.error;stat.maxfloatnullableSB2? Net 1-2 keV countsctphot.count;em.X-rayfloatnullablee_SB2? Lower 1{sigma} uncertainty on SB2 (6)ctstat.errorfloatnullableE_SB2? Upper 1{sigma} uncertainty on SB2 (6)ctstat.error;stat.maxfloatnullableHR? Hardness ratio; (HB-SB)/(HB+SB)phot.fluxfloatnullablee_HR? Lower 1{sigma} uncertainty on HRstat.errorfloatnullableE_HR? Upper 1{sigma} uncertainty on HRstat.error;stat.maxfloatnullableSC? Soft X-ray color; (SB2-SB1)/FBphot.flux;arith.ratiofloatnullablee_SC? Lower 1{sigma} uncertainty on SCstat.errorfloatnullableE_SC? Upper 1{sigma} uncertainty on SCstat.error;stat.maxfloatnullableHC? Hard X-ray color; (HB-SB2)/FBphot.flux;arith.ratiofloatnullablee_HC? Lower 1{sigma} uncertainty on HCstat.errorfloatnullableE_HC? Upper 1{sigma} uncertainty on HCstat.error;stat.maxfloatnullable