Milky Way halo velocity dispersion profile J/AJ/139/59 ivo://CDS.VizieR/J/AJ/139/59 doi:10.26093/cds/vizier.51390059 CDS Brown W.R. Geller M.J. Kenyon S.J. Diaferio A. 2012-05-20T15:40:28Z 2012-05-03T15:11:23Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr milky-way-galaxy early-type-stars visible-astronomy sloan-photometry radial-velocity We present a spectroscopic sample of 910 distant halo stars from the Hypervelocity Star survey from which we derive the velocity dispersion profile of the Milky Way halo. The sample is a mix of 74% evolved horizontal branch stars and 26% blue stragglers. We estimate distances to the stars using observed colors, metallicities, and stellar evolution tracks. Our sample contains twice as many objects with R>50kpc as previous surveys. We compute the velocity dispersion profile in two ways: with a parametric method based on a Milky Way potential model and with a non-parametric method based on the caustic technique originally developed to measure galaxy cluster mass profiles. The resulting velocity dispersion profiles are remarkably consistent with those found by two independent surveys based on other stellar populations: the Milky Way halo exhibits a mean decline in radial velocity dispersion of -0.38+/-0.12km/s/kpc over 15<R<75kpc. This measurement is a useful basis for calculating the total mass and mass distribution of the Milky Way halo. 2010AJ....139...59B https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/139/59 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007) http://www.sdss.org : SDSS Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/139/59 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/139/59 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/139/59 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/139/59 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/139/59 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/139/59 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/139/59/table1 (Velocity, SDSS photometry and absolute magnitudes of the HVS (HyperVelocity Star) program.) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/139/59/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/139/59/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/139/59/table1? 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https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/139/59?format=ascii Optical default J/AJ/139/59/table1 Velocity, SDSS photometry and absolute magnitudes of the HVS (HyperVelocity Star) program. recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int RAJ2000 Hour of Right Ascension (J2000) pos.eq.ra;meta.main DEJ2000 Degree of Declination (J2000) pos.eq.dec;meta.main g0mag Dereddened SDSS g band magnitude mag phot.mag;em.opt.B float e_g0mag The 1{sigma} error in g0mag mag stat.error;phot.mag float (u-g)0 Dereddened SDSS (u-g) color mag phot.color;em.opt.U;em.opt.B float e_(u-g)0 The 1{sigma} error in (u-g)0 mag stat.error float (g-r)0 Dereddened SDSS (g-r) color mag phot.color;em.opt.B;em.opt.R float e_(g-r)0 The 1{sigma} error in (g-r)0 mag stat.error float HRV Heliocentric radial velocity km/s spect.dopplerVeloc;pos.heliocentric float e_HRV The 1{sigma} error in HRV km/s stat.error float GLON Galactic longitude deg pos.galactic.lon GLAT Galactic latitude deg pos.galactic.lat float Vrf Velocity in the Galactocentric rest frame (1) km/s phys.veloc;pos.galactocentric float gBHB Absolute g band magnitude for a BHB (2) mag phys.magAbs float e_gBHB The 1{sigma} error in gBHB mag stat.error float RBHB Galactocentric distance if BHB kpc pos.distance;pos.galactocentric float gBS Absolute BS g band magnitude (3) mag phys.magAbs float e_gBS The 1{sigma} error in gBS mag stat.error float RBS Galactocentric distance if BS kpc pos.distance;pos.galactocentric float fBHB Likelihood of being BHB (4) stat.likelihood float DR7 Details of the SDSS-DR7 about this star meta.ref.url char Sloan Display the SDSS data for this star meta.ref.url char