J/ApJ/830/17ivo://CDS.VizieR/J/ApJ/830/17doi:10.26093/cds/vizier.18300017CDSBoehle A.Ghez A.M.Schodel R.Meyer L.Yelda S.Albers S.,Martinez G.D.Becklin E.E.Do T.Lu J.R.Matthews K.Morris M.R.,Sitarski B.Witzel G.2018-07-04T07:04:45Z2017-02-15T07:03:46ZCDS support team

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

cds-question@unistra.frastrometryproper-motionsinfrared-photometryWe present new, more precise measurements of the mass and distance of our Galaxy's central supermassive black hole, Sgr A*. These results stem from a new analysis that more than doubles the time baseline for astrometry of faint stars orbiting Sgr A*, combining 2 decades of speckle imaging and adaptive optics data. Specifically, we improve our analysis of the speckle images by using information about a star's orbit from the deep adaptive optics data (2005-2013) to inform the search for the star in the speckle years (1995-2005). When this new analysis technique is combined with the first complete re-reduction of Keck Galactic Center speckle images using speckle holography, we are able to track the short-period star S0-38 (K-band magnitude=17, orbital period=19yr) through the speckle years. We use the kinematic measurements from speckle holography and adaptive optics to estimate the orbits of S0-38 and S0-2 and thereby improve our constraints of the mass (M_bh_) and distance (R_o_) of SgrA*: M_bh_=(4.02+/-0.16+/-0.04)x10^6^M_{sun}_ and 7.86+/-0.14+/-0.04kpc. The uncertainties in M_bh_ and R_o_ as determined by the combined orbital fit of S0-2 and S0-38 are improved by a factor of 2 and 2.5, respectively, compared to an orbital fit of S0-2 alone and a factor of ~2.5 compared to previous results from stellar orbits. This analysis also limits the extended dark mass within 0.01 pc to less than 0.13x10^6^M_{sun}_ at 99.7% confidence, a factor of 3 lower compared to prior work.2016ApJ...830...17Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/830/17CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/783/131 : Kinematic of stars in Galactic center (Yelda+, 2014)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/ApJ/764/154 : Stellar populations in the central 0.5pc. I. (Do+, 2013)J/ApJ/725/331 : Astrometry in the Galactic Center (Yelda+, 2010)J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)J/A+A/502/91 : Proper motions of stars near SgrA* (Schoedel+, 2009)J/ApJ/707/L114 : The orbit of S2 star around Sgr A* (Gillessen+, 2009)J/ApJ/659/1241 : Stellar variability in Galactic Center (Rafelski+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/830/17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/830/17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/830/17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/830/17https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/830/17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/830/17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/830/17/table6 (Galactic Center secondary IR astrometric standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/830/17/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/830/17/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/830/17/table6?GETtext/xml+votable180.050000true266.416822977-29.0079238060.0055555555555555566/288308.432336135173973e-20 9.789355183173054e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/830/17?format=asciiInfrareddefaultJ/ApJ/830/17/table6Galactic Center secondary IR astrometric standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name, see [GKM98] for the naming convention (1998ApJ...509..678G)meta.ref;pos.framecharKpmag[7.4/15.8] Keck/NIRC2 K' band magnitudemagphot.mag;em.IR.KfloatEpIR[2006.96/2011.93] Average time of the IR positional measurements; decimal yearsyrtime.epochfloatRad[0.3/18.3] Radius from Sgr A*arcsecpos.angDistancefloatoRAOffset in Right Ascension from Sgr A*arcsecpos.eq.ra;arith.difffloate_oRA[1/2.5] Uncertainty in oRA (1)masstat.errorfloatoDEOffset in Declination from Sgr A*arcsecpos.eq.dec;arith.difffloate_oDE[1/2] Uncertainty in oDE (1)masstat.errorfloatpmRA[-9.4/10] Right Ascension proper motionmas/yrpos.pm;pos.eq.rafloate_pmRA[0.1/0.8] Uncertainty in pmRA (2)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-9/9.2] Declination proper motionmas/yrpos.pm;pos.eq.decfloate_pmDE[0.1/1.1] Uncertainty in pmDE (2)mas/yrstat.error;pos.pm;pos.eq.decfloatGCCatDisplay data from Yelda+, 2010, J/ApJ/725/331 and 2014, J/ApJ/783/131 for this starmeta.ref.urlintnullableSimbadNameSimbad column added by the CDSmeta.idchar_RACoordinates computed from oRA and oDE with Sgr A* SIMBAD position at 17:45:40.03599-29:00:28.1699 (right ascension part)degpos.eq.ra;meta.main_DECoordinates computed from oRA and oDE with Sgr A* SIMBAD position at 17:45:40.03599-29:00:28.1699 (declination part)degpos.eq.dec;meta.main