Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..181k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 181-188.
Astronomy and Astrophysics
Astronomy
191
Astronomical Models, Galactic Bulge, Galactic Structure, Infrared Telescopes, Milky Way Galaxy, Spacelab Payloads, Black Holes (Astronomy), Body Kinematics, Dark Matter, Mass To Light Ratios
Scientific paper
The Milky Way bulge is modeled as an oblate isotropic rotator with constant M/L ratio. A model with M/L2.2 micron = 1 successfully reproduces a variety of stellar velocity dispersion measurements for R between 2 and 1200 pc. An observed increase in the stellar velocity dispersion inside 2 pc requires either that there be an additional central mass of order 3 x 10 exp 6 solar mass or that the stellar motions become anisotropic there. The model has insufficient mass to reproduce the observed peak in the H I and CO rotation curve of 250 km/s at 300 pc; it is argued that the peak arises from noncircular gas motions and does not reflect the true mass of the bulge.
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