J/ApJ/759/116ivo://CDS.VizieR/J/ApJ/759/116doi:10.26093/cds/vizier.17590116CDSPark H.S.Lee M.G.Hwang H.S.Kim S.C.Arimoto N.Yamada Y.,Tamura N.Onodera M.2017-12-05T05:09:28Z2014-08-22T11:40:00ZCDS support team

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

cds-question@unistra.frchemical-abundancesglobular-star-clustersspectroscopyWe present a spectroscopic analysis of the metallicities, ages, and alpha-elements of the globular clusters (GCs) in the giant elliptical galaxy (gE) NGC 4636 in the Virgo Cluster. Line indices of the GCs are measured from the integrated spectra obtained with Faint Object Camera and Spectrograph on the Subaru 8.2m Telescope. We derive [Fe/H] values of 59 GCs based on the Brodie & Huchra (1990ApJ...362..503B) method, and [Z/H], age, and [{alpha}/Fe] values of 33 GCs from the comparison of the Lick line indices with single stellar population models. The metallicity distribution of NGC 4636 GCs shows a hint of a bimodality with two peaks at [Fe/H]=-1.23({sigma}=0.32) and -0.35({sigma}=0.19). The age spread is large from 2Gyr to 15Gyr and the fraction of young GCs with age <5Gyr is about 27%. The [{alpha}/Fe] of the GCs shows a broad distribution with a mean value [{alpha}/Fe]{approx}0.14dex. The dependence of these chemical properties on the galactocentric radius is weak. We also derive the metallicities, ages, and [{alpha}/Fe] values for the GCs in other nearby gEs (M87, M49, M60, NGC 5128, NGC 1399, and NGC 1407) from the line index data in the literature using the same methods as used for NGC 4636 GCs. The metallicity distribution of GCs in the combined sample of seven gEs including NGC 4636 is found to be bimodal, supported by the KMM test with a significance level of >99.9%. All these gEs harbor some young GCs with ages less than 5Gyr. The mean age of the metal-rich GCs ([Fe/H]>-0.9) is about 3Gyr younger than that of the metal-poor GCs. The mean value of [{alpha}/Fe] of the gE GCs is smaller than that of the Milky Way GCs. We discuss these results in the context of GC formation in gEs.2012ApJ...759..116Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/759/116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/544/A115 : Velocities of NGC 4636 globular clusters (Schuberth+, 2012)J/ApJ/709/377 : The globular cluster system of NGC 4636 (Park+, 2010)J/MNRAS/405/839 : Spectroscopic obs. of globular clusters (Sharina+, 2010)J/ApJ/695/1094 : Chandra observations of NGC 4636 (Posson-Brown+, 2009)J/A+A/459/391 : Dynamics of NGC 4636 GC system (Schuberth+, 2006)J/A+A/433/43 : C-T1 phot. of NGC 4636 GC system (Dirsch+, 2005)J/ApJS/116/1 : Old Stellar Populations. VI. Absorption-Line (Trager+ 1998)J/ApJS/102/29 : Extragalactic globular clusters (Huchra+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/759/116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/759/116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/759/116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/759/116https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/759/116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/759/116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/759/116/table6 (Metallicity, Age, and [{alpha}/Fe] of NGC 4636 globular clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/759/116/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/759/116/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/759/116/table6?GETtext/xml+votable180.050000true190.70945832.72344440.0055555555555555566/26313 26316https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/759/116?format=asciiOpticaldefaultJ/ApJ/759/116/table6Metallicity, Age, and [{alpha}/Fe] of NGC 4636 globular clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[82/10031] Object ID Number (G1)meta.id;meta.mainintprimaryLSimbad column added by the CDSmeta.ref.urlchar[Z/H]1? The [Z/H] derived from H{beta} vs. [MgFe]' grid methodlog(Sun)phys.abund.Zfloatnullablee_[Z/H]1? Error of [Z/H]1log(Sun)stat.error;src.redshiftfloatnullable[Z/H]2? Metallicity [Z/H] derived from <Fe> vs Mg2 gridlog(Sun)phys.abund.Zfloatnullablee_[Z/H]2? Error of [Z/H]2log(Sun)stat.error;src.redshiftfloatnullableage1[1.8/15]? Age derived from grid methodGyrtime.agefloatnullablee_age1[0/5]? Error of age1Gyrstat.errorfloatnullable[a/Fe]1? {alpha}-elements derived from grid methodlog(Sun)phys.abundfloatnullablee_[a/Fe]1? Error of [a/Fe]log(Sun)stat.error;phys.abundfloatnullable[Z/H]3? [Z/H] derived from {chi}^2^ minimization methodlog(Sun)phys.abund.Zfloatnullablee_[Z/H]3? Error of [Z/H]3log(Sun)stat.error;src.redshiftfloatnullableage2[1.2/15]? Age derived from {chi}^2^ minimization methodGyrtime.agefloatnullablee_age2? Error of age2Gyrstat.errorfloatnullable[a/Fe]2? {alpha}-elements derived from {chi}^2^ minimization methodlog(Sun)phys.abundfloatnullablee_[a/Fe]2? Error of [a/Fe]2log(Sun)stat.error;phys.abundfloatnullable[Fe/H][-2.2/0.4] The [Fe/H] derived from Brodie and Huchra method (1990ApJ...362..503B)log(Sun)phys.abund.Fefloate_[Fe/H]Error of [Fe/H]log(Sun)stat.error;phys.abund.FefloatSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from Park et al., 2010, Cat. J/ApJ/709/377 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Park et al., 2010, Cat. J/ApJ/709/377 (declination part)degpos.eq.dec;meta.mainJ/ApJ/759/116/indicesLick line indices with errors (tables 2--5)e_CN2? CN2 Lick index errormagstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[82/10031] Object ID Number (G1)meta.id;meta.mainintCN1? CN1 Lick line indexmagspect.indexfloatnullableCN2? CN2 Lick line indexmagspect.indexfloatnullableCa4227? Ca4227 Lick line index; in Angstroms0.1nmspect.indexfloatnullableG4300? G4300 Lick line index; in Angstroms0.1nmspect.line.eqWidthfloatnullableFe4383? Fe4383 Lick line index ; in Angstroms0.1nmspect.indexfloatnullableCa4455? Ca4455 Lick line index; in Angstroms0.1nmspect.indexfloatnullableFe4531? Fe4531 Lick line index; in Angstroms0.1nmspect.indexfloatnullableC24668? C24668 Lick line index; in Angstroms0.1nmspect.indexfloatnullableHbH{beta} Lick line index; in Angstroms0.1nmspect.indexfloatFe5015Fe5015 Lick line index; in Angstroms0.1nmspect.indexfloatMg1Mg1 Lick line indexmagspect.indexfloatMg2Mg2 Lick line indexmagspect.indexfloatMgbMgb Lick line index; in Angstroms0.1nmspect.indexfloatFe5270Fe5270 Lick line index; in Angstroms0.1nmspect.indexfloatFe5335Fe5335 Lick line index; in Angstroms0.1nmspect.indexfloatFe5406Fe5406 Lick line index; in Angstroms0.1nmspect.indexfloatFe5709? Fe5709 Lick line index; in Angstroms0.1nmspect.indexfloatnullableFe5782Fe5782 Lick line index; in Angstroms0.1nmspect.indexfloatNaDNaD Lick line index; in Angstroms0.1nmspect.indexfloatHdA? H{delta}A Lick line index; in Angstroms0.1nmspect.indexfloatnullableHgA? H{gamma}A Lick line index; in Angstroms0.1nmspect.indexfloatnullableHdF? H{delta}F Lick line index; in Angstroms0.1nmspect.indexfloatnullableHgF? H{gamma}F Lick line index; in Angstroms0.1nmspect.indexfloatnullablee_CN1? CN1 Lick index errormagstat.errorfloatnullablee_Ca4227? Ca4227 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_G4300? G4300 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_Fe4383? Fe4383 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_Ca4455? Ca4455 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_Fe4531? Fe4531 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_C24668? C24668 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_HbH{beta} Lick index error; in Angstroms0.1nmstat.errorfloate_Fe5015Fe5015 Lick index error; in Angstroms0.1nmstat.errorfloate_Mg1Mg1 Lick index errormagstat.errorfloate_Mg2Mg2 Lick index errormagstat.errorfloate_MgbMgb Lick index error; in Angstroms0.1nmstat.errorfloate_Fe5270Fe5270 Lick index error; in Angstroms0.1nmstat.errorfloate_Fe5335Fe5335 Lick index error; in Angstroms0.1nmstat.errorfloate_Fe5406Fe5406 Lick index error; in Angstroms0.1nmstat.errorfloate_Fe5709? Fe5709 Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_Fe5782Fe5782 Lick index error; in Angstroms0.1nmstat.errorfloate_NaDNaD Lick index error; in Angstroms0.1nmstat.errorfloate_HdA? H{delta}A Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_HgA? H{gamma}A Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_HdF? H{delta}F Lick index error; in Angstroms0.1nmstat.errorfloatnullablee_HgF? H{gamma}F Lick index error; in Angstroms0.1nmstat.errorfloatnullable