Spectroscopy of stars in the Galaxy's nuclear cluster Virtual Observatory Resource

Authors
  1. Do T.
  2. Ghez A.M.
  3. Morris M.R.
  4. Lu J.R.
  5. Matthews K.
  6. Yelda S.
  7. Larkin J.
  8. Published by
    CDS
Abstract

We 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.

Keywords
  1. line-intensities
  2. infrared-astronomy
  3. spectroscopy
  4. early-type-stars
  5. late-type-stars
  6. milky-way-galaxy
Bibliographic source Bibcode
2009ApJ...703.1323D
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https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/1323
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/703/1323
Document Object Identifer DOI
doi:10.26093/cds/vizier.17031323

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History

2011-11-21T13:20:11Z
Resource record created
2011-11-21T13:20:11Z
Created
2017-06-30T05:48:57Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr