J/ApJ/748/29ivo://CDS.VizieR/J/ApJ/748/29doi:10.26093/cds/vizier.17480029CDSRomanowsky A.J.Strader J.Brodie J.P.Mihos J.C.Spitler L.R.,Forbes D.A.Foster C.Arnold J.A.2020-07-01T11:24:26Z2013-11-08T08:47:09ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgalaxiesphotometryradial-velocityThe halos of galaxies preserve unique records of their formation histories. We carry out the first combined observational and theoretical study of phase-space halo substructure in an early-type galaxy: M87, the central galaxy in the Virgo cluster. We analyze an unprecedented wide-field, high-precision photometric and spectroscopic data set for 488 globular clusters (GCs), which includes new, large-radius Subaru/Suprime-Cam and Keck/DEIMOS observations. We find signatures of two substructures in position-velocity phase space. One is a small, cold stream associated with a known stellar filament in the outer halo; the other is a large shell-like pattern in the inner halo that implies a massive, hitherto unrecognized accretion event. We perform extensive statistical tests and independent metallicity analyses to verify the presence and characterize the properties of these features, and to provide more general methodologies for future extragalactic studies of phase-space substructure. The cold outer stream is consistent with a dwarf galaxy accretion event, while for the inner shell there is tension between a low progenitor mass implied by the cold velocity dispersion, and a high mass from the large number of GCs, which might be resolved by a ~0.5 L* E/S0 progenitor.2012ApJ...748...29Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/748/29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011)J/ApJ/743/149 : Color-metallicity relations. II. M87 GCs (Yoon+, 2011)J/ApJ/703/42 : HST photometry of M87 globular clusters (Peng+, 2009)J/AJ/131/866 : Hot populations in M87 globular clusters (Sohn+, 2006)J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004)J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001)J/ApJ/513/733 : Globular cluster system in M87 (Kundu+, 1999)J/AJ/115/1801 : VRI photometry of M87 globular clusters (Harris+ 1998)J/AJ/106/493 : Globular clusters in M87 (Lee+, 1993)J/ApJS/73/671 : M87 globular clusters BVI photometry (Couture+, 1990)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/748/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/748/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/748/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/748/29https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/748/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/748/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/748/29/table1 (Spectroscopic objects in M87 outer stream region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/29/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/29/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/29/table1?GETtext/xml+votable180.050000true187.3627112.848420.005555555555555556Cone search capability for table J/ApJ/748/29/table2 (CaII Triplet measurements of M87 Globular Clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/29/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/29/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/29/table2?GETtext/xml+votable180.050000true187.7245212.286820.0055555555555555566/27765 27767 27936 279382.367228618189496e-19 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/748/29?format=asciidefaultJ/ApJ/748/29/table1Spectroscopic objects in M87 outer stream regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (R7403 to R22843)meta.id;meta.maincharf_ID[a] a: probably bound to NGC 4461meta.codecharRAJ2000[187.213/187.464] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[12.814/13.185] Declination (J2000)degpos.eq.dec;meta.mainimag[15.18/22.97] Intrinsic i band magnitude (1)magphot.mag;em.opt.Ifloatg-i[0.35/2.65] Intrinsic (g-i) color index (1)magphot.color;em.opt.B;em.opt.IfloatRVel[-214/1876]? Radial velocitykm/sphys.veloc;pos.heliocentricintnullablee_RVel[5/74]? Uncertainty in RVel (2)km/sstat.error;spect.dopplerVelocintnullableTypeObject type: confirmed, marginal, star, or galaxy (3)src.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/748/29/table2CaII Triplet measurements of M87 Globular ClustersSimbadNameSimbad column added by the CDSmeta.idcharRAJ2000[187.67/188.338] Right Ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification (1)meta.id;meta.maincharDEJ2000[12.153/12.481] Declination (J2000)degpos.eq.dec;meta.mainimag[18.63/22.44] Intrinsic i band magnitudemagphot.mag;em.opt.Ifloatg-i[0.695/1.12]? Intrinsic (g-i) color indexmagphot.color;em.opt.B;em.opt.Ifloatnullablee_g-i[0.001/0.033]? Uncertainty in g-i (2)magstat.errorfloatnullableCaT[1.95/8.25] CaII triplet line strength ({AA}) (3)0.1nmspect.line.intensityfloate_CaT[0.01/0.53] Uncertainty in CaT0.1nmstat.errorfloatM87GCCross-match with M87 GCs catalogs (Cat. J/ApJS/197/33 and J/ApJ/559/812) within 5"meta.numberintnullable