Orbital decay and accretion of M32 by M31

Details Orbital decay and accretion of M32 by M31 Orbital decay and accretion of M32 by M31

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231...32b&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 32-34. Research supported by the University of Alabama.

Astronomy and Astrophysics

Astrophysics

14

Andromeda Galaxy, Elliptical Galaxies, Galactic Evolution, Orbit Decay, Stellar Evolution, Computerized Simulation, Decay Rates, Milky Way Galaxy, Orbital Velocity

Scientific paper

Tremaine (1976) estimated a decay time of approximately 300 million yr for the accretion of M32 by M31 as a consequence of dynamical friction. Recent estimates of the previously unknown position and velocity components for M32 are used in the present paper to obtain an improved estimate of the decay time for M32. Three computer simulations have been performed by assuming masses of 3.14 billion, 1.57 billion, and 430 million solar units for M32. The results obtained indicate that the decay time varies nearly inversely with mass and ranges from 420 million yr for a mass of 3.14 billion solar units to 3.2 billion yr for a mass of 430 million solar units.

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