Velocity dispersion and the stellar population in the central 1.2 parsecs of the Galaxy

Details Velocity dispersion and the stellar population in the central 1.2 parsecs of the Galaxy Velocity dispersion and the stellar population in the central 1.2 parsecs of the Galaxy

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..112s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 112-120.

Astronomy and Astrophysics

Astrophysics

127

Carbon Monoxide, Galactic Rotation, Infrared Spectra, Milky Way Galaxy, Star Distribution, Velocity Distribution, Galactic Nuclei, Mass To Light Ratios, Stellar Mass

Scientific paper

New observations of the 2.3 micron absorption band head of CO in integrated stellar light in the central 1.2 pc of the Galaxy are presented. These data confirm that the velocity dispersion of the stars increases toward the Galactic center and totally dominates their systematic rotation at small radii. The velocity dispersion is constant an average value of 125 km/s within about 30 arcsec projected diameter central region. The strength of the CO features decreases in the integrated faint light within the same region. These observations are all consistent with the hypothesis that both the diffuse 2 micron light and the bright 2 micron point sources in the central region are dominated by sources that have little or no CO absorption feature. The observed CO feature at projected distances less than 0.6 pc thus actually arises in stars that are at true radii greater than 0.6 pc. The mass distribution at radius between 3.7 and 0.6 pc from IRS 16 is strong evidence for an increasing mass/2 micron radiation ratio toward the Galactic center.

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