Statistics – Computation
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..108p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 108-121. Research supported by the University of Kans
Statistics
Computation
46
Astronomical Models, Computational Astrophysics, Cosmology, Galactic Evolution, Local Group (Astronomy), Andromeda Galaxy, Gravitational Effects, Hubble Constant, Mass Distribution, Milky Way Galaxy, Red Shift
Scientific paper
Observational tests of a model for the formation of the Local Group are presented and analyzed in which the mass concentration grows by gravitational accretion of local-pressure matter onto two seed masses in an otherwise homogeneous initial mass distribution. The evolution of the mass distribution is studied in an analytic approximation and a numerical computation. The initial seed mass and separation are adjusted to produce the observed present separation and relative velocity of the Andromeda Nebula and the Galaxy. If H(0) is adjusted to about 80 km/s/Mpc with density parameter Omega = 1, then the model gives a good fit to the motions of the outer members of the Local Group. The same model gives particle orbits at radius of about 100 kpc that reasonably approximate the observed distribution of redshifts of the Galactic satellites.
Holmes Michael R.
Jiang L. R.
Melott Adrian L.
Peebles Phillip James Edwin
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