J/A+A/459/777ivo://CDS.VizieR/J/A+A/459/777doi:10.26093/cds/vizier.34590777CDSRamsay G.Wu K.2007-07-15T22:55:53Z2007-07-15T22:52:59ZCDS support team

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

cds-question@unistra.frgalaxiesx-ray-sourcesROSAT observations found no convincing evidence for X-ray sources located in local dwarf spheroidal galaxies (dSph). Now with more sensitive instruments on board Chandra and XMM-Newton we can reach fainter luminosity levels. We report on an observation of the Sagittarius (Sgr) dSph made using Chandra and an observation of the Carina (Car) dSph made using XMM-Newton. Our observations are sensitive to sources with X-ray luminosities in the 0.1-10keV band of ~1x10^32^erg/s and 3x10^34^erg/s for the Sgr and Car fields respectively. We have identified a total of 80 sources in the Sgr field and 53 sources in the Car field. Although the source numbers are roughly consistent with the expected number of background AGN, we found a small fraction of X-ray sources which were soft and could be located in the host dSph. Follow-up optical/IR observations may help to identify their optical counterparts and hence determine their nature.2006A&A...459..777Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/459/777CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/1141 : Variables in the Sagittarius dSph (Mateo+ 1995)J/AJ/119/1760 : M54 and Sgr dSph VI photometry (Layden+, 2000)J/A+A/414/503 : Abundances in the Sgr dSph (Bonifacio+, 2004)J/AJ/130/2677 : Stars in the Carina dSph galaxy field (Majewski+, 2005)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/459/777https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/459/777http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/459/777https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/459/777https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/459/777http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/459/777GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/459/777/tablea1 (The X-ray sources found in the Chandra observations of the Sgr field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/459/777/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/459/777/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/459/777/tablea1?GETtext/xml+votable180.050000true283.6093333-30.49452780.005555555555555556Cone search capability for table J/A+A/459/777/tablea2 (The X-ray sources in the Carina field as detected using XMM-Newton)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/459/777/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/459/777/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/459/777/tablea2?GETtext/xml+votable180.050000true100.062083-50.9730830.0055555555555555566/39094 39097 39100 48035https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/459/777?format=asciiX-raydefaultJ/A+A/459/777/tablea1The X-ray sources found in the Chandra observations of the Sgr fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential number, [RW2006c] Sgr NNmeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainCR0.3-8Count rate in 0.3-8keV band (ct/10ks)0.0001count.s**-1phot.count;em.X-rayfloate_CR0.3-8rms uncertainty on CR0.3-8keV0.0001count.s**-1stat.errorfloatCR0.3-1Count rate in 0.3-1keV band0.0001count.s**-1phot.count;em.X-rayfloate_CR0.3-1rms uncertainty on CR0.3-1keV0.0001count.s**-1stat.errorfloatCR1-2Count rate in 1-2keV band0.0001count.s**-1phot.count;em.X-rayfloate_CR1-2rms uncertainty on CR1-2keV0.0001count.s**-1stat.errorfloatCR2-8Count rate in 2-8keV band0.0001count.s**-1phot.count;em.X-rayfloate_CR2-8rms uncertainty on CR2-8keV0.0001count.s**-1stat.errorfloatHR1Hardness ratio, HR1=(H-M)/(H+M+S) (1)phot.flux;arith.ratiofloate_HR1rms uncertainty on HR1stat.errorfloatHR2Hardness ratio, HR2=(M-S)/(H+M+S) (1)phot.flux;arith.ratiofloate_HR2rms uncertainty on HR2stat.errorfloatRmag? Magnitude, close to the UCAC2 R magnitudemagphot.mag;em.opt.RfloatnullableJ/A+A/459/777/tablea2The X-ray sources in the Carina field as detected using XMM-NewtonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential number, [RW2006c] Car NNmeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainCR0.2-10Count rate in 0.2-10keV band (1)ct/ksphot.count;em.X-rayfloate_CR0.2-10rms uncertainty on CR0.2-10keVct/ksstat.errorfloatCR0.2-1Count rate in 0.2-1keV band (1)ct/ksphot.count;em.X-rayfloate_CR0.2-1rms uncertainty on CR0.2-1keVct/ksstat.errorfloatCR1-2Count rate in 1-2keV band (1)ct/ksphot.count;em.X-rayfloate_CR1-2rms uncertainty on CR1-2keVct/ksstat.errorfloatCR2-10Count rate in 2-10keV band (1)ct/ksphot.count;em.X-rayfloate_CR2-10rms uncertainty on CR2-10keVct/ksstat.errorfloatHR1Hardness ratio, HR1=(H-M)/(H+M+S) (2)phot.flux;arith.ratiofloate_HR1rms uncertainty on HR1stat.errorfloatHR2Hardness ratio, HR2=(M-S)/(H+M+S) (2)phot.flux;arith.ratiofloate_HR2rms uncertainty on HR1stat.errorfloatRmag? Magnitude, close to UCAC2 R magnitudemagphot.mag;em.opt.Rfloatnullable