J/ApJ/703/1323ivo://CDS.VizieR/J/ApJ/703/1323doi:10.26093/cds/vizier.17031323CDSDo T.Ghez A.M.Morris M.R.Lu J.R.Matthews K.Yelda S.Larkin J.2017-06-30T05:48:57Z2011-11-21T13:20:11ZCDS support team

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

cds-question@unistra.frline-intensitiesinfrared-astronomyspectroscopyearly-type-starslate-type-starsmilky-way-galaxyWe report on the structure of the nuclear star cluster in the innermost 0.16pc of the Galaxy as measured by the number density profile of late-type giants. Using laser guide star adaptive optics in conjunction with the integral field spectrograph, OSIRIS, at the Keck II telescope, we are able to differentiate between the older, late-type (~1Gyr) stars, which are presumed to be dynamically relaxed, and the unrelaxed young (~6Myr) population. This distinction is crucial for testing models of stellar cusp formation in the vicinity of a black hole, as the models assume that the cusp stars are in dynamical equilibrium in the black hole potential. In the survey region, we classified 60 stars as early-type (O and early B; 22 newly identified) and 74 stars as late-type (K and M; 61 newly identified). We find that contamination from young stars is significant, with more than twice as many young stars as old stars in our sensitivity range (K'<15.5) within the central arcsecond.2009ApJ...703.1323Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/1323CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/534/A117 : NIR polarimetry of sources near SgrA* (Buchholz+, 2011)J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)J/A+A/499/483 : NIR observations of sources in galactic center (Buchholz+,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/ApJ/659/1241 : Stellar variability in Galactic Center (Rafelski+, 2007)J/ApJ/643/1011 : Early-type stars in the center of the Galaxy (Paumard+, 2006)J/A+A/373/608 : Early-type stars towards the Galactic Center. II. (Dufton+,J/A+AS/128/35 : New Sample of OH/IR stars (Sjouwerman+ 1998)J/ApJ/470/864 : JHKL photometry of the Galactic Center (Blum+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/1323https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/1323http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/1323https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/1323https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/1323http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/1323GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/1323/GCCstars (OSIRIS observations of late-type and early-type stars of the Galactic Central Cluster stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1323/GCCstars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1323/GCCstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1323/GCCstars?GETtext/xml+votable180.050000true266.41684389-29.007836110.005555555555555556Cone search capability for table J/ApJ/703/1323/table4 (OSIRIS spectra with unknown spectral type)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1323/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1323/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1323/table4?GETtext/xml+votable180.050000true266.41685667-29.007541670.0055555555555555566/288309.029278742763022e-20 9.029278742763022e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/1323?format=asciiInfrareddefaultJ/ApJ/703/1323/GCCstarsOSIRIS observations of late-type and early-type stars of the Galactic Central Cluster starsSimbadNameSimbad column added by the CDSmeta.idcharField[CEWSN] Field short name (4)obs.fieldcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identification (SN-NNN or IRS16WW-W)meta.id;meta.maincharTSimbad column added by the CDSmeta.code.classcharK'magKeckII/OSIRIS K'-band magnitude (~2.2um)magphot.mag;em.IR.KfloatRAoffOffset in right ascension from Sgr A*arcsecpos.eq.raDEoffOffset in declination from Sgr A*arcsecpos.eq.decfloatRadProjected distance from Sgr A* in the plane of the skyarcsecpos.angDistancefloatEpochEpoch in decimal yearsyrtime.epochfloatRef[1,5] Reference for spectral identification (1)meta.ref;pos.frameintEW? Equivalent width (NaI line for late-type stars or Br{gamma} for early-type stars) (2)0.1nmspect.line.eqWidthfloatnullablee_EW? 1{sigma} error in EW0.1nmstat.error;spect.line.eqWidthfloatnullableNobs? Number of observation(s) (3)meta.numberintnullableS/N? Signal to noise per pixel calculated between 2.212 and 2.218um.stat.snrintnullableR07Link to objects within 0.5" in Rafelski et al. 2007, Cat. J/ApJ/659/1241 when availablemeta.ref.urlintnullable_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/ApJ/703/1323/table4OSIRIS spectra with unknown spectral typerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identification (SN-NNN)meta.id;meta.maincharK'magKeckII/OSIRIS K'-band magnitude (~2.2um)magphot.mag;em.IR.KfloatRAoffOffset in right ascension from Sgr A*arcsecpos.eq.raDEoffOffset in declination from Sgr A*arcsecpos.eq.decfloatRadProjected distance from Sgr A* in the plane of the skyarcsecpos.angDistancefloatEpochEpoch in decimal yearsyrtime.epochfloatS/NSignal to noise per pixel calculated between 2.212 and 2.218um.stat.snrintR07Link to objects within 0.5" in Rafelski et al. 2007, Cat. J/ApJ/659/1241 when availablemeta.ref.urlintnullableSimbadSimbad column added by the CDSchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main