J/AJ/113/1026ivo://CDS.VizieR/J/AJ/113/1026doi:10.26093/cds/vizier.51131026CDSGebhardt K.Pryor C.Williams T.B.Hesser J.E.Stetson P.B.2023-04-06T16:50:24Z2006-04-19T08:46:35ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityWe have used an Imaging Fabry-Perot Spectrophotometer with the Sub-arcsecond Imaging Spectrograph on the Canada-France-Hawaii Telescope to measure velocities for 1534 stars in the globular cluster M15 (NGC 7078) with uncertainties between 0.5 and 10km/s. Combined with previous velocity samples, the total number of stars with measured velocities in M15 is 1597. An average seeing of 0.8" allowed us to obtain velocities for 144 stars within 10" of the center of M15, including 12 stars within 2". The velocity dispersion profile for M15 remains flat at a value of 11km/s from a radius of 0.4 into our innermost reliable point at 0.02 (0.06pc). Assuming an isotropic velocity dispersion tensor, this profile and the previously-published surface brightness profile can be equally well represented either by a stellar population whose M/L varies with radius from 1.7 in solar units at large radii to 3 in the central region, or by a population with a constant M/L of 1.7 and a central black hole of 1000M_{sun}_. A non-parametric mass model that assumes no black hole, no rotation, and isotropy constrains the mass density of M15 to better than 30% at a radius of 0.07 parsecs. The mass-density profile of this model is well represented by a power law with an exponent of -2.2, the value predicted by models of cluster core-collapse. Using the assumption of local thermodynamic equilibrium, we estimate the present-day mass function and infer a significant number of 0.6-0.7 M_{sun}_ objects in the central few parsecs, 85% of which may be in the form of stellar remnants. Not only do we detect rotation; we find that the position angle of the projected rotation axis in the central 10" is 100deg different from that of the whole sample. We also detect an increase in the amplitude of the rotation at small radii. Although this increase needs to be confirmed with better-seeing data, it may be the result of a central mass concentration. (Copyright) 1997 American Astronomical Society.1997AJ....113.1026Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/113/1026CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/1699 : Paper II. (47 Tuc, NGC 6397 & M30) (Gebhardt+ 1995)J/ApJ/347/251 : Dynamics of Globular Cluster M15 (Peterson+ 1989)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/113/1026https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/113/1026http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/113/1026https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/113/1026https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/113/1026http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/113/1026GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/113/1026/table1 (Velocity data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1026/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1026/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1026/table1?GETtext/xml+votable180.050000true322.493203312.16669970.0055555555555555566/12405https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/113/1026?format=asciiOpticaldefaultJ/AJ/113/1026/table1Velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_IDindicates that other mesurements exist in table2meta.ref.urlcharIDStar identificationmeta.id;meta.maincharprimaryXposX offset from cluster center (eastward)arcsecpos.cartesian.xfloatYposY offset from cluster center (northward)arcsecpos.cartesian.y;arith.diff;instr.detfloatVelMean velocitykm/sphys.veloc;stat.meanfloate_VelUncertainty in Velkm/sstat.errorfloatV(FP)Fabry-Perot magnitudemagphot.mag;em.opt.VfloatProb? Probability of the chi-square%src.var.indexfloatnullableNoteNotemeta.notecharSimbadNameSimbad column added by the CDSmeta.idchar_RAPositions computed from (Xpos,Ypos) by VizieR, using the list by Buonanno et al. (1983A&AS...51...83B) (right ascension part)degpos.eq.ra;meta.main_DEPositions computed from (Xpos,Ypos) by VizieR, using the list by Buonanno et al. (1983A&AS...51...83B) (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1026/table2Repeat measurementsFP92? Velocity from 1992 CTIO data (paper I, Pryor et al., 1993BAAS...25Q1406P)km/sphys.velocfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identificationmeta.id;meta.maincharCFHT95? Velocity from the 1995 CFHT datakm/sphys.velocfloatnullablee_CFHT95? Uncertainty in CFHT95km/sstat.errorfloatnullableCFHT94? Velocity from the 1994 CFHT datakm/sphys.velocfloatnullablee_CFHT94? Uncertainty in CFHT94km/sstat.errorfloatnullablee_FP92? Uncertainty in FP92km/sstat.errorfloatnullableFP91? Velocity from 1991 CTIO data (paper I, Pryor et al., 1993BAAS...25Q1406P)km/sphys.velocfloatnullablee_FP91? Uncertainty in FP91km/sstat.errorfloatnullablePSC? Velocity from Peterson et al. (1989) (Cat. <J/ApJ/347/251>)km/sphys.velocfloatnullablee_PSC? Uncertainty in PSCkm/sstat.errorfloatnullable