J/ApJ/802/30ivo://CDS.VizieR/J/ApJ/802/30doi:10.26093/cds/vizier.18020030CDSZhang H.-X.Peng E.W.Cote P.Liu C.Ferrarese L.Cuillandre J.-C.,Caldwell N.Gwyn S.D.J.Jordan A.Lancon A.Li B.Munoz R.P.,Puzia T.H.Bekki K.Blakeslee J.P.Boselli A.Drinkwater M.J.,Duc P.-A.Durrell P.Emsellem E.Firth P.Sanchez-Janssen R.2017-11-28T13:21:45Z2015-08-24T12:29:59ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyinfrared-photometryvisible-astronomybroad-band-photometryradial-velocitygalaxy-classification-systemsThe origin of ultra-compact dwarfs (UCDs; r_h_>~10pc) --objects larger and more massive than typical globular clusters (GCs), but more compact than typical dwarf galaxies-- has been hotly debated in the 15yrs since their discovery. Even whether UCDs should be considered galactic in origin, or simply the most extreme star clusters, is not yet settled. We present the dynamical properties of 97 spectroscopically confirmed UCDs and 911 GCs associated with the central cD galaxy of the Virgo cluster, M87. Our UCDs, of which 89% have M_*_>~2x10^6^M_{sun}_ and 92% are as blue as the classic blue GCs, nearly triple the confirmed sample of Virgo UCDs, providing by far the best opportunity for studying global dynamics of a UCD system. We found that (1) UCDs have a surface number density profile that is shallower than that of blue GCs in the inner ~70kpc and as steep as that of red GCs at larger radii; (2) UCDs exhibit a significantly stronger rotation than GCs, and blue GCs seem to have a velocity field that is more consistent with that of the surrounding dwarf ellipticals than with that of UCDs; (3) UCDs have an orbital anisotropy profile that is tangentially biased at radii <~40kpc and radially biased farther out, whereas blue GCs become more tangentially biased at larger radii beyond ~40kpc; (4) GCs with M_*_>~2x10^6^M_{sun}_ have rotational properties indistinguishable from the less massive ones, suggesting that it is the size, instead of mass, that differentiates UCDs from GCs as kinematically distinct populations. We conclude that most UCDs in M87 are not consistent with being merely the most luminous and extended examples of otherwise normal GCs. The radially biased orbital structure of UCDs at large radii is in general agreement with the "tidally threshed dwarf galaxy" scenario.2015ApJ...802...30Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/802/30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/443/1151 : AIMSS Project. I. (Norris+, 2014)J/MNRAS/428/389 : SLUGGS GCs in early-type galaxies (Pota+, 2013)J/ApJ/748/29 : Spectroscopy of M87 globular clusters (Romanowsky+, 2012)J/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011)J/AJ/142/199 : Sizes and luminosities of stellar systems (Brodie+, 2011)J/ApJ/737/86 : UCD galaxies in the Coma cluster (Chiboucas+, 2011)J/A+A/531/A4 : Ultra compact dwarfs and globulars in Hya I (Misgeld+, 2011)J/AJ/137/4956 : Globular clusters around NGC 1407 (Romanowsky+, 2009)J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)J/ApJS/180/54 : GC candidates in ACS Virgo survey. (Jordan+, 2009)J/AJ/136/2295 : Ultra-compact dwarf candidates in ACO S0740 (Blakeslee+, 2008)J/ApJ/660/1186 : VCC galaxies classification with SDSS (Lisker+, 2007)J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007)J/ApJS/164/334 : ACS Virgo Cluster Survey. VI (Ferrarese+, 2006)J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004)J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/802/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/802/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/802/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/802/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/802/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/802/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/802/30/table1 (Ultra-compact dwarfs from the Next Generation Virgo cluster Survey (NGVS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/802/30/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/802/30/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/802/30/table1?GETtext/xml+votable180.050000true187.7152112.23610.0055555555555555566/27743 27765 27767 27936 279387.952274030004205e-20 5.950631229554308e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/802/30?format=asciiInfraredOpticaldefaultJ/ApJ/802/30/table1Ultra-compact dwarfs from the Next Generation Virgo cluster Survey (NGVS)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSet[on] o=old or n=new sample (1)meta.idcharIDUltra-compact dwarf (UCD) galaxy namemeta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainHRV[556/2419] Heliocentric radial velocity (V_los_)km/sspect.dopplerVeloc;pos.heliocentricinte_HRV[2/140] HRV uncertaintykm/sstat.errorintu*mag[19.7/24]? CFHT/Megacam u* band AB magnitude (2)magphot.mag;em.opt.Ufloatnullablee_u*mag[0/0.03]? u*mag uncertaintymagstat.error;phot.mag;em.opt.Ufloatnullablegmag[18.4/23] CFHT/Megacam g-band AB magnitude (2)magphot.mag;em.opt.Bfloate_gmag[0/0.01]? gmag uncertaintymagstat.error;phot.mag;em.opt.Bfloatnullablermag[17.9/22.6]? CFHT/Megacam r-band AB magnitude (2)magphot.mag;em.opt.Rfloatnullablee_rmag[0/0.01]? rmag uncertaintymagstat.error;phot.mag;em.opt.Rfloatnullableimag[17.5/22.3] CFHT/Megacam i-band AB magnitude (2)magphot.mag;em.opt.Ifloate_imag[0/0.02]? imag uncertaintymagstat.error;phot.mag;em.opt.Ifloatnullablezmag[17.3/22.3]? CFHT/Megacam z-band AB magnitude (2)magphot.mag;em.opt.Ifloatnullablee_zmag[0/0.03]? zmag uncertaintymagstat.error;phot.mag;em.opt.IfloatnullableKsmag[17.1/22.4]? CFHT/WIRCam Ks-band AB magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Ksmag[0/0.05]? Ksmag uncertaintymagstat.error;phot.mag;em.IR.KfloatnullableE(B-V)[0.02/0.04] Galactic reddening determined by Schlegel et al. (1998ApJ...500..525S)magphot.color.excessfloatrh[0.6/40.2]? Half-light radius measured on NGVS imagespcphys.size.radiusfloatnullablee_rh[0.1/8.4]? rh uncertaintypcstat.errorfloatnullablerhHST[9.7/100.6]? Half-light radius measured on HST images (3)pcphys.size.radiusfloatnullableS11display the data from Strader et al. 2011, J/ApJS/197/33 or/and Brodie et al. 2011, J/AJ/142/199 for this objectmeta.numberintnullableNEDSimbad column added by the CDSmeta.ref.urlchar