Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981afz....17..429k&link_type=abstract
(Astrofizika, vol. 17, July-Sept. 1981, p. 429-444.) Astrophysics, vol. 17, no. 3, Jan. 1982, p. 238-247. Translation.
Astronomy and Astrophysics
Astrophysics
6
Galactic Structure, Mass Distribution, Mass To Light Ratios, Orbital Mechanics, Radial Velocity, Astrometry, Circular Orbits, Orbital Elements
Scientific paper
Orbital mass estimates of 423 double galaxies are analyzed in an investigation of the dynamics of these systems. Data simulating the conditions of pair selections based on the isolation criterion reveal an appreciable influence on the estimates of the masses of spurious, nonisolated pairs. Projection factors for different types of orbital motion of the members of pairs are analyzed to show that the assumption of strongly elongated orbits with eccentricity greater than 0.8 does not agree with observational data. Closely spaced and wide pairs have almost the same mass-to-luminosity ratio. It is concluded that differences in estimates of the masses of pairs of galaxies obtained by different authors are due predominantly to differing purities of the original samples.
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