Statistics – Computation
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1614k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1614-1621. Research supported by Digital Equipment Corp.
Statistics
Computation
104
Andromeda Galaxy, Astronomical Photometry, Computational Astrophysics, Galactic Bulge, Galactic Mass, Galactic Rotation, Galactic Structure, Mass To Light Ratios
Scientific paper
New mass models are derived with emphasis on determining the bulge mass/light ratio. Inside 6 kpc, the gas rotation curve is complex and probably does not measure the true circular velocity. Therefore, the bulge M/L ratio is constrained primarily by the bulge stellar velocity dispersion. The bulge kinematics inside 1 arcmin are consistent with the bulge being an oblate isotropic rotator. Overall, the best-fitting model has an apparent bulge M/L = 5 and disk M/L = 10. The rotation curve predicted by this model rises smoothly from the center to 1 kpc, and then is nearly flat out to 30 kpc. The predicted inner rotation curve forms an upper envelope to the observed complex gas kinematics.
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