Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.215....1n&link_type=abstract
Astrophysics and Space Science, vol. 215, no. 1, p. 1-9
Astronomy and Astrophysics
Astrophysics
2
Andromeda Galaxy, Astronomical Models, Galactic Rotation, Globular Clusters, Cluster Analysis, Galactic Mass, Milky Way Galaxy, Speed Indicators
Scientific paper
By analysing a sample of 158 globular clusters belonging to the galaxy M 31 or Andromeda Nebula (AN) in the framework of a spherically symmetric model with constant circular velocity a value 0f 260 +/- 40 km/s for this quantity is obtained. It is also found that the number density of AN globulars roughly decreases as the cube of the distance to the center with a cutoff radius of about 40 kpc. The implied AN mass within this cutoff is about 6 x 1011 solar masses. Bearing in mind the model limitations this mass is rather an upper limit. The present results suggest 1.5 as a probable value for the mass ratio of AN to the Milky Way unless their massive dark coronae are significantly different in size. The velocity distribution of AN globulars seems to be close to isotropic.
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