J/ApJ/760/87ivo://CDS.VizieR/J/ApJ/760/87doi:10.26093/cds/vizier.17600087CDSStrader J.Fabbiano G.Luo B.Kim D.-W.Brodie J.P.Fragos T.,Gallagher J.S.Kalogera V.King A.Zezas A.2017-11-10T11:15:49Z2013-05-23T14:38:09ZCDS support team

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

cds-question@unistra.frhst-photometrygalaxiesglobular-star-clustersgalaxy-classification-systemsWe present g and z photometry and size estimates for globular clusters (GCs) in the massive Virgo elliptical NGC 4649 (M60) using a five-pointing Hubble Space Telescope/Advanced Camera for Surveys mosaic. The metal-poor GCs show a monotonic negative metallicity gradient of -0.43+/-0.10dex per dex in radius over the full radial range of the data, out to ~24kpc. There is evidence for substantial color substructure among the metal-rich GCs. The metal-poor GCs have typical sizes ~0.4pc larger than the metal-rich GCs out to large galactocentric distances (>~20kpc), favoring an intrinsic explanation for the size difference rather than projection effects. There is no clear relation between half-light radius and galactocentric distance beyond ~15kpc, suggesting that the sizes of GCs are not generically set by tidal limitation. Finally, we identify ~20 candidate ultracompact dwarfs that extend down to surprisingly faint absolute magnitudes (M_z_~-8.5), and may bridge the gap between this class and "extended clusters" in the Local Group. Three of the brighter candidates have published radial velocities and can be confirmed as bona fide ultracompact dwarfs; follow-up spectroscopy will determine the nature of the remainder of the candidates.2012ApJ...760...87Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/760/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJS/204/14 : Deep Chandra observations of NGC 4649. Paper I. (Luo+, 2013)J/A+A/525/A19 : Phot. of globulars in early galaxies (Chies-Santos+, 2011)J/MNRAS/416/155 : GCs in five early-type galaxies (Faifer+, 2011)J/ApJ/690/512 : LMXBs & globulars in early-type galaxies (Humphrey, 2009)J/ApJS/180/54 : GC candidates in ACS Virgo survey. (Jordan+, 2009)J/ApJ/674/857 : RVs and CT1 magnitudes in M60 galaxy (Lee+, 2008)J/ApJS/171/101 : GCs in the ACS Virgo cluster survey (Jordan+, 2007)J/ApJ/662/525 : LMXBs in globular clusters of 5 galaxies (Kundu+, 2007)J/MNRAS/355/608 : NGC 4649 (M60) globular clusters (Forbes+, 2004)J/ApJS/153/223 : ACS Virgo Cluster Survey. I. (Cote+, 2004)J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/760/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/760/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/760/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/760/87https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/760/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/760/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/760/87/table1 (Globular cluster candidates in NGC 4649)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/760/87/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/760/87/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/760/87/table1?GETtext/xml+votable180.050000true190.950800611.54329660.0055555555555555566/279072.1350832807657816e-19 4.369938604086476e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/760/87?format=asciiOpticaldefaultJ/ApJ/760/87/table1Globular cluster candidates in NGC 4649recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDGlobular cluster candidate identifier (<[SFL2012] ANNN> in Simbad)meta.id;meta.maincharprimaryUSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmagThe g band AB magnitude (HST/ACS F475W)magphot.mag;em.opt.Bfloate_gmagError in gmagmagstat.error;phot.mag;em.opt.BfloatzmagThe z band AB magnitude (HST/ACS F850LP)magphot.mag;em.opt.Ifloate_zmagError in zmagmagstat.error;phot.mag;em.opt.Ifloatg-zThe (g-z) color indexmagphot.color;em.opt;em.optfloate_g-zError in g-zmagstat.errorfloatrhg? Cluster g band measured radiuspcphys.size.radiusfloatnullablee_rhg? Random measurement error in rhgpcstat.errorfloatnullablerhz? Cluster z band measured radiuspcphys.size.radiusfloatnullablee_rhz? Random measurement error in rhzpcstat.errorfloatnullablerhavg? Weighted average g and z band radiuspcphys.size.radiusfloatnullablee_rhavg? Random measurement error in rhavgpcstat.errorfloatnullableJ?[Y ] In Jordan et al. catalog? (1)meta.codecharJ09Cross-match within 2.2" with Jordan et al. 2009, Cat. J/ApJS/180/54meta.ref.urlintnullablePapICross-match within 2.2" with Paper I (Luo et al. 2013, Cat. J/ApJS/204/14)meta.ref.urlintnullableJ/ApJ/760/87/table2Candidate ultracompact dwarf galaxies in NGC 4649recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_ID[s] s: spectroscopically confirmed objectmeta.codecharIDUltra compact dwarf galaxy candidate identifiermeta.id;meta.maincharzMagAbsolute z-band magnitudemagphys.magAbsfloatg-zThe (g-z) color indexmagphot.color;em.opt;em.optfloatrhHalf-light radiuspcphys.size.radiusfloatDistProjected galactocentric distancekpcpos.distancefloatSimbadSimbad column added by the CDSmeta.ref.urlchar