J/A+A/490/641ivo://CDS.VizieR/J/A+A/490/641doi:10.26093/cds/vizier.34900641CDSServillat M.Dieball A.Webb N.A.Knigge C.Cornelisse R.Barret D.,Long K.S.Shara M.M.Zurek D.R.2009-02-14T06:07:29Z2009-02-14T07:02:58ZCDS support team

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

cds-question@unistra.frglobular-star-clustersx-ray-sourcesultraviolet-astronomyUsing new Chandra X-ray observations and existing XMM-Newton X-ray and Hubble far ultraviolet observations, we aim to detect and identify the faint X-ray sources belonging to the Galactic globular cluster NGC 2808 in order to understand their role in the evolution of globular clusters. We present a Chandra X-ray observation of the Galactic globular cluster NGC 2808. We classify the X-ray sources associated with the cluster by analysing their colours and variability. Previous observations with XMM-Newton and far ultraviolet observations with the Hubble Space Telescope are re-investigated to help identify the Chandra sources associated with the cluster. We compare our results to population synthesis models and observations of other Galactic globular clusters. We detect 113 sources, of which 16 fall inside the half-mass radius of NGC 2808 and are concentrated towards the cluster core.2008A&A...490..641Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/490/641CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2007)J/A+AS/84/59 : Photometry of NGC 2808 (Ferraro+, 1990)J/ApJ/562/368 : UV photometry in NGC 2808 (Brown+, 2001)J/A+A/413/343 : RGB stars in NGC 2808 (Cacciari+, 2004)J/ApJ/625/156 : FUV-NUV observations of NGC 2808 (Dieball+, 2005)J/A+A/480/397 : XMM observations of NGC 2808 and NGC 4372 (Servillat+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/490/641https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/490/641http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/490/641https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/490/641https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/490/641http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/490/641GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/490/641/table1 (Detected Chandra sources in the direction of NGC 2808)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/490/641/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/490/641/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/490/641/table1?GETtext/xml+votable180.050000true138.0079583-64.8640750.0055555555555555566/37294 37636https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/490/641?format=asciiX-rayUVdefaultJ/A+A/490/641/table1Detected Chandra sources in the direction of NGC 2808recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SDW2008]Sequential numbermeta.recordintDet[wh] Detection method (WAVDETECT or by hand)meta.codecharXMMXMM-Newton ID \linkRole{data from Servillat et al. 2008, Cat. J/A+A/480/397} (1)meta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainError1sigma detection positional errorarcsecstat.errorfloatCtsNumber of X-ray countsctphot.count;em.X-rayintFluxCChandra flux (10^-14^erg/cm^2^/s)1e-17W.m**-2phot.flux;em.X-rayfloate_FluxCrms uncertainty on Chandra flux1e-17W.m**-2stat.errorfloatFluxX? XMM flux (10^-14^erg/cm^2^/s)1e-17W.m**-2phot.flux;em.X-rayfloatnullablee_FluxX? rms uncertainty on XMM flux1e-17W.m**-2stat.errorfloatnullableHRCChandra hardness ratio (2)phot.flux;arith.ratiofloate_HRCrms uncertainty on Chandra hardness ratiostat.errorfloatHRX? XMM hardness ratio (2)phot.flux;arith.ratiofloatnullablee_HRX? rms uncertainty on XMM hardness ratiostat.errorfloatnullableNH[0.12] Absorption column density best fit1e+22cm**-2phys.columnDensity;meta.modelledfloatPHPower law of photon index best fitspect.indexfloatKSKolmogorov-Smirnov probability of constancysrc.var.indexfloat