J/AJ/107/1745ivo://CDS.VizieR/J/AJ/107/1745doi:10.26093/cds/vizier.51071745CDSYanny B.Guhathakurta P.Bahcall J.N.Schneider D.P.2023-04-06T16:50:06Z2006-07-24T15:51:47ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvisible-astronomybroad-band-photometryThe projected density distribution of resolved stars near the center of M15 is shown to be consistent with either a power-law cusp N(r) ~ r^{alpha}^, with {alpha} ~ -0.85+/-0.2, or with a King model with a core of radius <~ 2" (best fit r(core)=1.3"). The inferred slope is in agreement with the theoretical value, {alpha}=-0.75, calculated by Bahcall and Wolf for the distribution of equal-mass stars surrounding a massive black hole and is also consistent with the radial profile expected from core collapse without a central black hole. The object AC 214 is a candidate for the central density cusp. Analysis of Monte Carlo simulations of the diffuse light indicates that, using current analysis techniques and available data, the residual light is not a reliable indicator of the true density distribution. This is contrary to earlier work. Photometric measurements in V and I of more than 5x10^3^ stars (and in U, V, and I of >~1500 stars) are used to construct color-magnitude diagrams in the central 1' of M15. Fourteen blue straggler candidates are identified in the inner 20". The central color gradient noticed by previous researchers is caused by a central depletion of bright red giant stars rather than an excess of blue stragglers or blue horizontal branch stars.1994AJ....107.1745Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/107/1745CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/106/154 : HST Observations in inner region of M15 (Ferraro+ 1993)J/AJ/107/2067 : Fabry-Perot measurements of M15 (Gebhardt+, 1994)J/AJ/110/704 : RR Lyrae in M15 (Silbermann+ 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/107/1745https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/107/1745http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/107/1745https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/107/1745https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/107/1745http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/107/1745GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/107/1745/table3 (Stellar photometry and astrometry for M15 (V < 18.1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/107/1745/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/107/1745/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/107/1745/table3?GETtext/xml+votable180.050000true322.479563612.16475920.0055555555555555566/12405https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/107/1745?format=asciiOpticaldefaultJ/AJ/107/1745/table3Stellar photometry and astrometry for M15 (V < 18.1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (YGBS number)meta.id;meta.mainintoRARight ascension offset from AC 211=ID 653 (1)arcsecpos.eq.ra;arith.difffloatoDEDeclination offset from AC 211=ID 653 (1)arcsecpos.eq.dec;arith.difffloatVmagVisual magnitude (filter F555W)magphot.mag;em.opt.VfloatV-IV-I color (F785LP - F555W)magphot.color;em.opt.V;em.opt.IfloatU-V? U-V color (F336W - F555W)magphot.color;em.opt.U;em.opt.Vfloatnullablen_U-V[ab] Note for U-V (2)meta.notechar_RAPosition, computed by VizieR from oRA and oDE (right ascension part)degpos.eq.ra;meta.main_DEPosition, computed by VizieR from oRA and oDE (declination part)degpos.eq.dec;meta.main