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Title:
Velocity differences in binary galaxies. I - Suggestions for a nonmonotonic, two-component distribution
Authors:
Schneider, Stephen E.; Salpeter, Edwin E.
Affiliation:
AA(Massachusetts, University, Amherst), AB(Cornell University, Ithaca, NY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 32-48. (ApJ Homepage)
Publication Date:
01/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTROMETRY, GALACTIC CLUSTERS, RED SHIFT, GALACTIC MASS, GALACTIC STRUCTURE, VELOCITY DISTRIBUTION
DOI:
10.1086/170913
Bibliographic Code:
1992ApJ...385...32S

Abstract

A compilation of published high-precision velocities for 107 isolated galaxies is presented and used to obtain the distribution function of their velocity differences. The distribution shows a peak at the zero difference as expected, but it also exhibits a preference for values near 72 km/2. The distribution function declines smoothly beyond about 72 km/s, with no significant peaks at multiples of 72 km/s, as claimed by Tifft (1977, 1980, 1982). It is argued that criteria for selection procedures on binary galaxy samples which are defined on the basis of too narrow a projected separation in the sky can produce a nonmonotonic distribution if the orbits are eccentric. Such orbits can produce a strong secondary peak only if the level of incompleteness in binary-galaxy samples is quite high, suggesting that the present statistical estimates of the masses of binary galaxies should be reevaluated.

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