Two-Body Escape Speeds in Merged Four-Galaxy Groups

Details Two-Body Escape Speeds in Merged Four-Galaxy Groups Two-Body Escape Speeds in Merged Four-Galaxy Groups

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..353v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 2/JAN15, P. 353, 1994

Astronomy and Astrophysics

Astronomy

4

Scientific paper

In the neighbourhood of the Local Group of galaxies, some high speeds of relative motion are observed. In particular, the speeds of Maffei 1 and IC 342 relative to the Andromeda galaxy are in the range 250-300 km s^-1^, which are rather high velocities for the local neighbourhood. Here we study groups of four galaxies, initially composed of two binaries, and follow their evolution through two mergers until only two galaxies remain. We find that the speed of separation of the two galaxies can reach the above-mentioned range of values if (a) the rotation curves of the galaxies rise to this same range of values, and (b) the mass of the group is not excessive. We use these conditions to estimate the mass-to- light ratio of the galaxies in the local area.

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