The gravitational instability picture and the formation of the Local Group

Details The gravitational instability picture and the formation of the Local Group The gravitational instability picture and the formation of the Local Group

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362....1p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 1-13. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

76

Cosmology, Galactic Clusters, Galactic Evolution, Gravitational Effects, Local Group (Astronomy), Galactic Mass, Hubble Constant, Interacting Galaxies, Red Shift

Scientific paper

The numerical action method of Peebles (1989, 1990) is used here to study the effect of external masses on the internal dynamics of the Local Group (LG). The use of redshifts of outlying members of the LG and of nearby external groups as tests of the model of formation of the system is explored, and the character of the primeval mass fluctuation needed to produce the present galaxy distributions and motions within the gravitational instability picture is studied. It is argued that the numerical action method gives a useful measure of the primeval constrast. The numerical result for the LG is reasonably close to what would be expected from the observed fluctuations in galaxy counts on larger scales.

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