J/A+A/455/453ivo://CDS.VizieR/J/A+A/455/453doi:10.26093/cds/vizier.34550453CDSChies-Santos A.L.Pastoriza M.G.Santiago B.X.Forbes D.A.2017-10-02T19:28:49Z2006-12-31T13:31:48ZCDS support team

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

cds-question@unistra.frglobular-star-clustersx-ray-sourceshst-photometryNGC 5846 is a giant elliptical galaxy with a previously well studied globular cluster system (GCS), known to have a bimodal colour distribution with a remarkably high red fraction. Here we revisit the central galaxy regions searching for new globular cluster (GC) candidates, and measure magnitudes, colours and sizes for them. We also search for their X-ray counterparts. Methods: We use archival Hubble Space Telescope WFPC2 images, from which we modelled and subtracted the host light distribution to increase the available sample of GCs. We performed photometry on the central objects, and measured sizes and coordinates for the entire GC system known in this galaxy. Results: We detect two dozen previously unknown GC candidates in the central reg ions. Reliable sizes are obtained for about 60 GCs; their typical effective radii are in the range 3-5pc. The largest clusters are located in the central regions. We find 7 X-ray counterparts to GCs, most of them in the central region. They are among the most luminous X-ray sources in NGC 5846. They are also optically luminous, compact and belong to the red subpopulation. Conclusions: The GCS of NGC 5846 is composed of relatively luminous X-ray sources.2006A&A...455..453Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/455/453CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/130/1502 : NGC 5846 group: photometry and spectroscopy (Mahdavi+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/455/453https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/455/453http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/455/453https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/455/453https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/455/453http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/455/453GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/455/453/table3 (Positions and photometry for the entire GCS of NGC 5846)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/455/453/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/455/453/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/455/453/table3?GETtext/xml+votable180.050000true226.62287961.60062720.005555555555555556Cone search capability for table J/A+A/455/453/table4 (Sizes and related parameters for GCs successfully measured by ISHAPE)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/455/453/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/455/453/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/455/453/table4?GETtext/xml+votable180.050000true226.62508221.63301740.0055555555555555566/8196https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/455/453?format=asciiX-raydefaultJ/A+A/455/453/table3Positions and photometry for the entire GCS of NGC 5846recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXpixX CCD coordinatepixpos.cartesian.x;instr.detfloatYpixY CCD coordinatepixpos.cartesian.y;instr.detfloatRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainMSimbad column added by the CDSmeta.ref.urlcharVmagV magnitude (F555W)magphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatImagI magnitude (F814W)magphot.mag;em.opt.Ifloate_Imagrms uncertainty on Imagmagstat.error;phot.mag;em.opt.IfloatV-IV-I colour index (F555W-F814W)magphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatPointing[CNS] HST/WFPC2 pointing Central, North or Southmeta.notecharChip[1/4] HST/WFPC2 chip numbermeta.id;instrintJ/A+A/455/453/table4Sizes and related parameters for GCs successfully measured by ISHAPErecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmagV magnitude (F555W)magphot.mag;em.opt.VfloatImagI magnitude (F814W)magphot.mag;em.opt.IfloatV-IV-I colour index (F555W-F814W)magphot.color;em.opt.V;em.opt.IfloatReffEffective radiuspcphys.size.radiusfloatchiratiochi ratio (chi^2^/chi0^2^)stat.fit.chi2floatT3Position and photometry from table3meta.ref.urlchar