J/MNRAS/414/1329ivo://CDS.VizieR/J/MNRAS/414/1329doi:10.26093/cds/vizier.74141329CDSChiang Y.-K.Kong A.K.H.2024-07-14T20:14:51Z2012-03-15T10:14:39ZCDS support team

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

cds-question@unistra.frgalaxiesx-ray-sourcesWe investigate the long-term variability exhibited by the X-ray point sources in the starburst galaxy M82. By combining nine Chandra observations taken between 1999 and 2007, we detect 58 X-ray point sources within the D_25_ isophote of M82 down to a luminosity of ~10^37^erg/s. Of these 58 sources, we identify three supernova remnant candidates and one supersoft source. 26 sources in M82 exhibit long-term (i.e. days to years) flux variability and three show long-term spectral variability. Furthermore, we classify 26 sources as variables and 10 as persistent sources. Among the total 26 variables, 17 varied by a flux ratio of >3 and six are transient candidates. By comparing with other nearby galaxies, M82 shows extremely strong long-term X-ray variability that 47 per cent of the X-ray sources are variables with a flux ratio of >3. The strong X-ray variability of M82 suggests that the population is dominated by X-ray binaries.2011MNRAS.414.1329Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/414/1329CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/414/1329https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/414/1329http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/414/1329https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/414/1329https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/414/1329http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/414/1329GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/414/1329/table2 (Chandra source properties for M82)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/414/1329/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/414/1329/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/414/1329/table2?GETtext/xml+votable180.050000true148.7945569.66536890.0055555555555555566/7606https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/414/1329?format=asciiX-raydefaultJ/MNRAS/414/1329/table2Chandra source properties for M82NotesNotes (7)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintCXOUSource name, HHMMSS.s+DDMMSS (CXOU J)meta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainLXMaximum X-ray luminosity (1)1e+31Wphys.luminosity;em.X-rayfloatl_SfluxLimit flag on SFluxmeta.code.errorcharSfluxSignificance parameter of long-term flux variability (2)stat.fit.goodnessfloatl_RLimit flag on Rmeta.code.errorcharRFmax/Fmin ratio (3)phot.flux;arith.ratiofloate_R? rms uncertainty in Rstat.errorfloatnullableSHR1? Significance parameter of HR1 variability (4)stat.fit.goodnessfloatnullablen_SHR1[gi] Note on SHR1 (5)meta.notecharSHR2? Significance parameter of HR2 variability (6)stat.fit.goodnessfloatnullablen_SHR2[hjk] Note on SHR2 (5)meta.notechar