Physics – Optics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917225d&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.25; Bulletin of the American Astronomical Society,
Physics
Optics
Scientific paper
We present the results from laser guide star adaptive optics observations of the galactic center with the integral-field spectrometer OSIRIS at 2 microns on the Keck II telescope. The observations of the 2" x 3" field centered on Sgr A* resulted in spectral line detections of over 30 stars. Of the stars detected, five are newly spectroscopically confirmed massive young B type stars. Twelve late type stars are also newly spectroscopically identified in this field. Combining these results with astrometry obtained by our group at the Keck Observatory over the last 12 years, we have: (1) improved our estimates of the black hole properties (eg. mass and distance); (2) obtained the orbital parameters for additional young stars, which tests current ideas of how stars might form in this particularly inhospitable environment; (3) obtained limits for the line of sight distances to many late-type stars, which allows us to test previous claims of a drop in the number density of late type stars close to the supermassive black hole.
Becklin Eric E.
Do Tuan
Ghez Andrea
Larkin Jason
Lu Jianhua
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