J/ApJ/750/91ivo://CDS.VizieR/J/ApJ/750/91doi:10.26093/cds/vizier.17500091CDSChattopadhyay T.Sharina M.Davoust E.De T.Chattopadhyay A.K.2018-01-05T08:56:58Z2014-01-20T13:55:19ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgalaxiesvisible-astronomygalaxy-classification-systemsmetallicityWe present a statistical analysis of the properties of a large sample of dynamically hot old stellar systems, from globular clusters (GCs) to giant ellipticals, which was performed in order to investigate the origin of ultracompact dwarf galaxies (UCDs). The data were mostly drawn from Forbes et al. (2008, Cat. J/MNRAS/389/1924). We recalculated some of the effective radii, computed mean surface brightnesses and mass-to-light ratios, and estimated ages and metallicities. We completed the sample with GCs of M31. We used a multivariate statistical technique (K-Means clustering), together with a new algorithm (Gap Statistics) for finding the optimum number of homogeneous sub-groups in the sample, using a total of six parameters (absolute magnitude, effective radius, virial mass-to-light ratio, stellar mass-to-light ratio, and metallicity). We found six groups. FK1 and FK5 are composed of high- and low-mass elliptical galaxies, respectively. FK3 and FK6 are composed of high-metallicity and low-metallicity objects, respectively, and both include GCs and UCDs. Two very small groups, FK2 and FK4, are composed of Local Group dwarf spheroidals. Our groups differ in their mean masses and virial mass-to-light ratios. The relations between these two parameters are also different for the various groups. The probability density distributions of metallicity for the four groups of galaxies are similar to those of the GCs and UCDs. The brightest low-metallicity GCs and UCDs tend to follow the mass-metallicity relation like elliptical galaxies. The objects of FK3 are more metal-rich per unit effective luminosity density than high-mass ellipticals.2012ApJ...750...91Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/750/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/549/A60 : Ages and [Fe/H] of M31 globular clusters (Cezario+, 2013)J/AJ/143/14 : Lick indices of M31 globular clusters (Schiavon+, 2012)J/AJ/141/61 : Star clusters in M31. II. (Caldwell+, 2011)J/A+A/508/1285 : Metallicities of M31 globular clusters (Galleti+, 2009)J/MNRAS/389/1924 : Old stellar systems (globulars to ellipticals)J/A+A/463/455 : Nearby gal. with ionized gas. III. (Annibali+, 2007)J/A+A/450/105 : Properties of 153 Galactic globular clusters (Bica+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/750/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/750/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/750/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/750/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/750/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/750/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/750/91/table1 (Photometric and structural parameters of the objects of the sample studied.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/750/91/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/750/91/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/750/91/table1?GETtext/xml+votable180.050000true6.0223292-72.08144440.0055555555555555566/697 948 1700 1701 1707 2142 2145 2214 2227 2230 2236 2251 2261 2432 2621 2622 2623 2666 2704 2708 2709 2710 4212 4447 4691 4990 5701 6093 6389 6951 7214 7225 7385 7560 7642 7655 7925 7986 8173 8193 8195 8575 8656 8763 9368 9436 9443 9468 9471 9666 9812 10183 10203 10336 10378 10379 10400 10401 10523 10628 11246 11262 11263 11389 11435 11691 11791 12425 12943 13336 14489 15056 16898 17472 17605 17606 17612 17761 17773 17779 17982 18123 18184 18209 18931 18935 19091 19432 19506 19900 20277 20282 21017 22644 22746 22922 23088 23296 24681 24732 24733 24839 24843 24913 24920 25083 25100 25383 25647 25768 26055 26125 26135 26313 26596 26803 27079 27186 27207 27515 27564 27580 27604 27669 27714 27718 27719 27725 27730 27731 27738 27740 27742 27764 27765 27767 27769 27771 27773 27857 27907 27910 27912 27913 27919 27936 27938 27951 28032 28033 28067 28142 28150 28221 28249 28251 28361 28495 28515 28517 28705 28751 28768 28778 28970 28973 29195 29222 29233 29289 29870 30378 30769 31019 31115 31417 33321 33330 33954 34028 34098 34242 34493 34534 34535 34695 34967 35720 35928 35969 36152 36156 36172 36621 36632 36785 37266 37294 37429 38321 38347 38356 38465 38621 38658 38675 38693 38704 38842 38852 38853 39035 39100 40025 40252 40321 40472 41847 42076 42314 42466 42841 42955 42990 43125 43214 43227 43262 43263 43312 43597 43697 43700 43714 43828 44000 44086 44220 44247 44627 44629 44812 45469 45770 46035 46043 46389 46568 46608 46618 46910 46987 47078 47157 47190 47201 47383 47386 47397 47777 47868 47971 48035 48160 48434 48645 48698https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/750/91?format=asciiOpticaldefaultJ/ApJ/750/91/table1Photometric and structural parameters of the objects of the sample studied.SimbadNameSimbad column added by the CDSmeta.idcharNameNamemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogRh[0.1/4.8] Log of half light radiuslog(pc)physdoubleKMag[-26.5/-6.8] Absolute K band magnitudemagphys.magAbs;em.IR.KfloatmuhK[11.2/26.1] K band surface brightnessmag.arcsec**-2phot.mag.sb;em.IR.KfloatMv/LK[0.2/141] Virial mass to K band luminosity ratiosolMass/solLumphys.composition.massLightRatiofloatM/LV[0.1/84] Baryonic mass to K band luminosity ratiosolMass/solLumphys.composition.massLightRatiofloatU-B[-0.2/0.7]? The (U-B) color indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V[0.4/1.3]? The (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-I[0.6/1.4]? The (V-I) color indexmagphot.color;em.opt.V;em.opt.IfloatnullableB-K[0.1/6.5]? The (B-K) color indexmagphot.color;em.opt.B;em.IR.Kfloatnullable[Fe/H][-1.9/0.3]? Metallicity from this worklog(Sun)phys.abund.ZfloatnullableAge[0.1/14]? Age from this workGyrtime.agefloatnullableu_AgeUncertainty flag on Agemeta.code.error;time.agechar[Fe/H]l[-2.3/0.7]? Metallicity in literaturelog(Sun)phys.abund.Fefloatnullableu_[Fe/H]lUncertainty flag on [Fe/H]lmeta.code.error;phys.abund.FecharAgel[0.4/19]? Age in literatureGyrtime.agefloatnullableu_AgelUncertainty flag on Agelmeta.code.errorcharRefReference(s) for [Fe/H]l and Agel (see refs.dat file)meta.ref;pos.framecharGroup[1/6] Group number (1)meta.idintNEDSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/750/91/refsReferencesRefReference codemeta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommCommentmeta.notechar