The bulge of M 31 - Velocity dispersions and dynamical model

Details The bulge of M 31 - Velocity dispersions and dynamical model The bulge of M 31 - Velocity dispersions and dynamical model

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72...12s&link_type=abstract

Astronomy and Astrophysics, vol. 72, no. 1-2, Feb. 1979, p. 12-17.

Astronomy and Astrophysics

Astrophysics

23

Andromeda Galaxy, Astronomical Models, Dynamic Models, Galactic Radiation, Stellar Motions, Stellar Rotation, Angular Momentum, Astrodynamics, Light Emission, Stellar Luminosity, Stellar Mass, Stellar Models, Stellar Spectrophotometry, Velocity Distribution

Scientific paper

A simple dynamical model based on the Jeans equations, which are solved by starting with a mass distribution obeying the fourth-power-of-distance law in projection, is applied to the inner region of the bulge of M31, between 0.03 and 0.7 kpc from the center. In conjunction with spectroscopic observations providing the integrated stellar rotation curve and velocity dispersion, this model confirms that the mass-to-light ratio is small (M/L (blue) equals 6), and it leads to nearly isotropic dispersions.

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