Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385...32s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 32-48.
Astronomy and Astrophysics
Astrophysics
31
Astrometry, Galactic Clusters, Red Shift, Galactic Mass, Galactic Structure, Velocity Distribution
Scientific paper
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.
Salpeter Edwin E.
Schneider Stephen E.
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