J/ApJ/821/44ivo://CDS.VizieR/J/ApJ/821/44doi:10.26093/cds/vizier.18210044CDSFritz T.K.Chatzopoulos S.Gerhard O.Gillessen S.Genzel R.Pfuhl O.,Tacchella S.Eisenhauer F.Ott T.2017-10-03T05:12:52Z2016-07-22T12:06:52ZCDS support team

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

cds-question@unistra.frproper-motionsradial-velocitymilky-way-galaxyinfrared-photometryWe obtain the basic properties of the nuclear cluster of the Milky Way. First, we investigate the structural properties by constructing a stellar density map of the central 1000" using extinction-corrected old star counts from VISTA, WFC3/IR, and VLT/NACO data. We describe the data using two components. The inner, slightly flattened (axis ratio of q=0.80+/-0.04) component is the nuclear cluster, while the outer component corresponds to the stellar component of the circumnuclear zone. For the nuclear cluster, we measure a half-light radius of 178+/-51"~7+/-2pc and a luminosity of M_Ks_=-16.0+/-0.5. Second, we measure detailed dynamics out to 4pc. We obtain 10351 proper motions from AO data, and 2513 radial velocities from VLT/SINFONI data. We determine the cluster mass by means of isotropic spherical Jeans modeling. We fix the distance to the Galactic Center and the mass of the supermassive black hole. We model the cluster either with a constant M/L or with a power law. For the latter case, we obtain a slope of 1.18+/-0.06. We get a cluster mass within 100" of M_100"_=(6.09+/-0.53|_fixR_0_+/-0.97|_R_0_)x10^6^M_{sun}_ for both modeling approaches. A model which includes the observed flattening gives a 47% larger mass (see Chatzopoulos et al. 2015MNRAS.447..948C). Our results slightly favor a core over a cusp in the mass profile. By minimizing the number of unbound stars within 8", we obtain a distance of R_0_=8.53_-0.15_^+0.21^kpc when using an R0 supermassive black hole mass relation from stellar orbits. Combining our results, we obtain M/L=0.51+/-0.12M_{sun}/L_{sun},Ks_, which is roughly consistent with a Chabrier IMF.2016ApJ...821...44Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/821/44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/809/143 : K-band spectra of stars within MW central 1pc (Do+, 2015)J/ApJ/808/106 : NIR spectroscopic obs. in the Galactic Center (Stostad+, 2015)J/A+A/570/A2 : Spectra and RVs of nuclear stars (Feldmeier+, 2014)J/A+A/566/A47 : MW nuclear star cluster extinction map (Schoedel+, 2014)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/ApJ/779/L6 : 3D kinematic obs. of stars in Galactic Centre (Do+, 2013)J/ApJ/764/154 : Stellar populations in the central 0.5pc. I. (Do+, 2013)J/A+A/549/A57 : Young, massive star candidates in Sgr A* (Nishiyama+, 2013)J/ApJ/737/73 : Infrared extinction toward the Galactic Centre (Fritz+, 2011)J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)J/ApJ/703/1323 : Spectrosc. of stars in the Galaxy's nuclear cluster (Do+ 2009)J/ApJ/699/186 : VLA observations of the Galactic center (Zhao+, 2009)J/A+A/502/91 : Proper motions of stars near SgrA* (Schoedel+, 2009)J/ApJ/697/1741 : Warped disks of YSOs in Galactic center (Bartko+, 2009)J/A+A/499/483 : NIR obs. of sources in galactic center (Buchholz+, 2009)J/ApJ/681/1254 : Radial velocities of stars in the Galactic Center (Zhu+, 2008)J/ApJ/643/1011 : Early-type stars in the center of the Galaxy (Paumard+, 2006)J/ApJ/597/323 : Cool stars at the Galactic Center (Blum+, 2003)J/A+AS/92/43 : OH/IR stars close to Gal. Center in radio (Lindqvist+ 1992)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/821/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/821/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/821/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/821/44https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/821/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/821/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/821/44/table9 (Radially sorted velocity data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/821/44/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/821/44/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/821/44/table9?GETtext/xml+votable180.050000true266.41684028-29.007843890.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/821/44?format=asciiOpticalInfrareddefaultJ/ApJ/821/44/table9Radially sorted velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRad[0.1/89.3] Projected radius from Sgr A*arcsecphys.angSize;srcfloatoRAOffset in Right Ascension from Sgr A* (1)arcsecpos.eq.ra;arith.difffloatoDEOffset in Declination from Sgr A* (1)arcsecpos.eq.dec;arith.difffloatpmRA[-19.1/15.3]? Proper motion along Right Ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA[0.01/10]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-14/23.1]? Proper motion along Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.01/10]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableRVel[-815/520]? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[1/87]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullableHmag[9.8/23.8]? H band magnitudemagphot.mag;em.IR.HfloatnullableKsmag[8.3/18.6]? Ks band magnitudemagphot.mag;em.IR.Kfloatnullable_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main