J/ApJS/181/605ivo://CDS.VizieR/J/ApJS/181/605doi:10.26093/cds/vizier.21810605CDSBrassington N.J.Fabbiano G.Kim D.-W.Zezas A.Zepf S.Kundu A.,Angelini L.Davies R.L.Gallagher J.Kalogera V.Fragos T.King A.R.,Pellegrini S.Trinchieri G.2017-06-13T11:08:40Z2010-01-18T21:52:15ZCDS support team

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

cds-question@unistra.frx-ray-sourcesglobular-star-clustersspectroscopyphotometryWe present the properties of the discrete X-ray sources detected in our monitoring program of the globular cluster (GC) rich elliptical galaxy, NGC 4278, observed with Chandra ACIS-S in six separate pointings, resulting in a co-added exposure of 458ks. From this deep observation, 236 sources have been detected within the region overlapped by all observations, 180 of which lie within the D25 ellipse of the galaxy. These 236 sources range in L_X_ from 3.5x10^36^erg/s (with 3{sigma} upper limit <=1x10^37^erg/s) to ~2x10^40^erg/s, including the central nuclear source which has been classified as a LINER. From optical data, 39 X-ray sources have been determined to be coincident with a GC, these sources tend to have high X-ray luminosity, with 10 of these sources exhibiting L_X_>1x10^38^erg/s. From X-ray source photometry, it has been determined that the majority of the 236 point sources that have well-constrained colors have values that are consistent with typical low-mass X-ray binary spectra, with 29 of these sources expected to be background objects from the log N-log S relation. There are 103 sources in this population that exhibit long-term variability, indicating that they are accreting compact objects. Three of these sources have been identified as transient candidates, with a further three possible transients. Spectral variations have also been identified in the majority of the source population, where a diverse range of variability has been identified, indicating that there are many different source classes located within this galaxy.2009ApJS..181..605Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/181/605CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/181/605https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/181/605http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/181/605https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/181/605https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/181/605http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/181/605GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/181/605/Xsources (Master source list, with coadded results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/605/Xsources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/605/Xsources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/605/Xsources?GETtext/xml+votable180.050000true185.098529.27053330.0055555555555555566/28495https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/181/605?format=asciiX-rayOpticaldefaultJ/ApJS/181/605/XsourcesMaster source list, with coadded resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintq_[BFK2009][gl] Quality of detection (1)meta.code.qualchar[BFK2009]Master identification numbermeta.id;meta.mainintprimaryn_[BFK2009]Simbad column added by the CDSmeta.ref.urlcharCXOUThe IAU name (JHHMMSS.s+DDMMSS)meta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRad? Source extraction radiusarcsecphys.angSizefloatnullablee_pos? Position uncertainty (PU) (2)arcsecstat.errorfloatnullableS/N? Signal-to-noise ratiostat.snrfloatnullablelogLXLog 0.3-0.8 keV luminosity (3)log(1e-07W)phys.luminosity;em.X-rayfloatulogLX? The 3{sigma} upper limit value of logLXlog(1e-07W)phys.luminosity;em.X-rayfloatnullablevLTLong-term variability (4)meta.code;src.varcharv1Short-term variability: Bayesian block analysis (5)meta.code;src.varcharv2Short-term variability: Komogorov-Smirnov test (5)meta.code;src.varcharOcorrOptical association (6)meta.codecharDistDistance from galaxy centerarcsecpos.angDistancefloatn_Dist[b] Indicates Dist is within the D_25_ ellipsemeta.notecharFlagRemarks (7)meta.code.errorcharf_Bct[<= ] Limit flag on Bct (1)meta.codecharBct? Net broad band (0.3-8keV) countsctphot.count;em.X-rayfloatnullablee_Bct? Error in Bctctstat.errorfloatnullableS1ct? Net soft 1 band (0.3-0.9keV) countsctphot.count;em.X-rayfloatnullablee_S1ct? Error in S1ctctstat.errorfloatnullableS2ct? Net soft 2 band (0.9-2.5keV) countsctphot.count;em.X-rayfloatnullablee_S2ct? Error in S2ctctstat.errorfloatnullableSct? Net soft band (0.3-2.5keV) countsctphot.count;em.X-rayfloatnullablee_Sct? Error in Sctctstat.errorfloatnullableHct? Net hard band (2.5-8keV) countsctphot.count;em.X-rayfloatnullablee_Hct? Error in NHctctstat.errorfloatnullableScct? Net conventional soft band (0.5-2keV) countsctphot.count;em.X-rayfloatnullablee_Scct? Error in Scctctstat.errorfloatnullableHcct? Net conventional hard band (2-8keV) countsctphot.count;em.X-rayfloatnullablee_Hcct? Error in NHcctctstat.errorfloatnullableHR? Hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HR? Lower limit uncertainty in HRstat.errorfloatnullableE_HR? Upper limit uncertainty in HRstat.error;stat.maxfloatnullableC21? The C21 X-ray color (3)phot.count;arith.ratiofloatnullablee_C21? Lower limit uncertainty in C21stat.errorfloatnullableE_C21? Upper limit uncertainty in C21stat.error;stat.maxfloatnullableC32? The C32 X-ray color (4)phot.count;arith.ratiofloatnullablee_C32? Lower limit uncertainty in C32stat.errorfloatnullableE_C32? Upper limit uncertainty in C32stat.error;stat.maxfloatnullableSignif? Significance of change (5)stat.fit.goodnessfloatnullableBraw? Raw broad band (0.3-8keV) source countsctphot.count;em.X-rayfloatnullableBbg? Raw broad band (0.3-8keV) background countsctinstr.backgroundfloatnullableS1raw? Raw soft 1 band (0.3-0.9keV) source countsctphot.count;em.X-rayfloatnullableS1bg? Raw soft 1 band (0.3-0.9keV) background countsctinstr.backgroundfloatnullableS2raw? Raw soft 2 band (0.9-2.5keV) source countsctphot.count;em.X-rayfloatnullableS2bg? Raw soft 2 band (0.9-2.5keV) background countsctinstr.backgroundfloatnullableHraw? Raw hard band (2.5-8keV) source countsctphot.count;em.X-rayfloatnullableHbg? Raw hard band (2.5-8keV) background countsctinstr.backgroundfloatnullableBcraw? Raw conventional broad band (0.5-8keV) source countsctphot.count;em.X-rayfloatnullableBcbg? Raw conventional broad band (0.5-8keV) background countsctinstr.backgroundfloatnullableScraw? Raw conventional soft band (0.5-2keV) source countsctphot.count;em.X-rayfloatnullableScbg? Raw conventional soft band (0.5-2keV) background countsctinstr.backgroundfloatnullableHcraw? Raw conventional hard band (2-8keV) source countsctphot.count;em.X-rayfloatnullableHcbg? Raw conventional hard band (2-8keV) background countsctinstr.backgroundfloatnullableJ/ApJS/181/605/XobsSource counts, hardness ratios, color-color values and variability for the individual observationsObsobservation numbermeta.idintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BFK2009]Master identification numbermeta.id;meta.mainintf_Bct[<= ] Limit flag on Bct (1)meta.codecharBct? Net broad band (0.3-8keV) countsctphot.count;em.X-rayfloatnullablee_Bct? Error in Bctctstat.errorfloatnullableS1ct? Net soft 1 band (0.3-0.9keV) countsctphot.count;em.X-rayfloatnullablee_S1ct? Error in S1ctctstat.errorfloatnullableS2ct? Net soft 2 band (0.9-2.5keV) countsctphot.count;em.X-rayfloatnullablee_S2ct? Error in S2ctctstat.errorfloatnullableSct? Net soft band (0.3-2.5keV) countsctphot.count;em.X-rayfloatnullablee_Sct? Error in Sctctstat.errorfloatnullableHct? Net hard band (2.5-8keV) countsctphot.count;em.X-rayfloatnullablee_Hct? Error in NHctctstat.errorfloatnullableScct? Net conventional soft band (0.5-2keV) countsctphot.count;em.X-rayfloatnullablee_Scct? Error in Scctctstat.errorfloatnullableHcct? Net conventional hard band (2-8keV) countsctphot.count;em.X-rayfloatnullablee_Hcct? Error in NHcctctstat.errorfloatnullableHR? Hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HR? Lower limit uncertainty in HRstat.errorfloatnullableE_HR? Upper limit uncertainty in HRstat.error;stat.maxfloatnullableC21? The C21 X-ray color (3)phot.count;arith.ratiofloatnullablee_C21? Lower limit uncertainty in C21stat.errorfloatnullableE_C21? Upper limit uncertainty in C21stat.error;stat.maxfloatnullableC32? The C32 X-ray color (4)phot.count;arith.ratiofloatnullablee_C32? Lower limit uncertainty in C32stat.errorfloatnullableE_C32? Upper limit uncertainty in C32stat.error;stat.maxfloatnullablev1? Short-term variability: Bayesian block analysismeta.code;src.varcharv2? Short-term variability: Komogorov-Smirnov testmeta.code;src.varcharSignif? Significance of change (5)stat.fit.goodnessfloatnullablef_logLX[<= ] Limit flag on LogLX (1)meta.codecharlogLX? Log 0.3-0.8keV luminosity (6)log(1e-07W)phys.luminosity;em.X-rayfloatnullablen_logLX[i ] Indicates infinite value (for table 7)meta.notecharJ/ApJS/181/605/optProperties of optical sources correlated with an X-ray point source (1) or classified as "Excluded Matches": sources detected between 0.6" and 3" of an X-ray point source (2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSimbad column added by the CDSmeta.codechar[BFK2009]X-ray source numbermeta.id;meta.mainintVmagV-band magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatImagI-band magnitudemagphot.mag;em.opt.Ifloate_ImagUncertainty in Imagmagstat.error;phot.mag;em.opt.IfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloate_V-IUncertainty in V-I color indexmagstat.error;phot.color;em.opt.VfloatSepSeparation between the X-ray source and the globular cluster (GC)arcsecpos.angDistancefloatsep1Error-relative separation (ratio between separation and the combined position error)stat.fit.goodnessfloat