J/ApJ/599/1067ivo://CDS.VizieR/J/ApJ/599/1067doi:10.26093/cds/vizier.15991067CDSDi Stefano R.Kong A.K.H.Vandalfsen M.L.Harris W.E.Murray S.S.,Delain K.M.2006-07-25T09:24:38Z2006-07-25T09:22:14ZCDS support team

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

cds-question@unistra.frx-ray-sourcesglobular-star-clustersx-ray-binary-starsWe report on the population of point sources discovered during an 18.5ks Chandra ACIS-S observation of the Sombrero galaxy. We present the luminosity function and the spectra of the six brightest sources, consider correlations with globular clusters (GCs) and with planetary nebulae, and study the galaxy's population of very soft sources. We detected 122 sources. Twenty-two sources are identified as very soft; of these, five appear to be classical luminous supersoft X-ray sources (SSSs), while 17 may belong to the slightly harder class referred to as quasi-soft (QSSs). There is an overdensity of very soft sources within 2kpc of the nucleus, which is itself the brightest X-ray source. Very soft sources are also found in the disk and halo, with one QSS in a globular cluster (GC).2003ApJ...599.1067Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/599/1067CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)J/MNRAS/327/1116 : VI photometry of Sombrero globular clusters (Larsen+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/599/1067https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/599/1067http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/599/1067https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/599/1067https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/599/1067http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/599/1067GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/599/1067/table1 (Source List)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/599/1067/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/599/1067/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/599/1067/table1?GETtext/xml+votable180.050000true182.41125-11.6475280.0055555555555555566/25083 25440https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/599/1067?format=asciiX-raydefaultJ/ApJ/599/1067/table1Source ListrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[DKV2003]Object designation (XNNN)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSctNet counts in the soft (0.1-1.1keV) bandctphot.count;em.X-rayfloate_Sctrms uncertainty on Sctctstat.errorfloatMctNet counts in the medium (1.1-2keV) bandctphot.count;em.X-rayfloate_Mctrms uncertainty on Mctctstat.errorfloatHctNet counts in the hard (2-7keV) bandctphot.count;em.X-rayfloate_Hctrms uncertainty on e_Hctctstat.errorfloatLXX-ray luminosity (1)1e+31Wphys.luminosity;em.X-rayfloatBmag? B magnitude (from USNO-B1.0, <I/284>)magphot.mag;em.opt.BfloatnullableRmag? R magnitude (from USNO-B1.0, <I/284>)magphot.mag;em.opt.RfloatnullableKmag? K magnitude (from 2 MASS, <II/246>)magphot.mag;em.IR.KfloatnullableNotesNotes (2)meta.notechar