Homogeneous sample of double galaxies. III - Kinematics and structure. IV - Orientation, angular momenta, peculiar motions

Details Homogeneous sample of double galaxies. III - Kinematics and structure. IV - Orientation, angular momenta, peculiar motions Homogeneous sample of double galaxies. III - Kinematics and structure. IV - Orientation, angular momenta, peculiar motions

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981afz....17..675k&link_type=abstract

(Astrofizika, vol. 17, Oct.-Dec. 1981, p. 675-707.) Astrophysics, vol. 17, no. 4, Apr. 1982, p. 363-383. Translation.

Astronomy and Astrophysics

Astrophysics

11

Circular Orbits, Galactic Clusters, Galactic Structure, Orbit Calculation, Angular Momentum, Galactic Evolution, Kinematics, Luminosity, Mass To Light Ratios, Radial Velocity

Scientific paper

Confirmation has been obtained for Karachentsev's (1981) ascription of predominance to circular orbits among the orbits of double galaxies, by applying to 361 pairs a method which uses the dependence of the mean difference between component radial velocities on the projection of their linear separation. Pairs of elliptical galaxies are distinguished by their smaller separation, but have the same orbital mass/luminosity ratio as SS pairs. Pair interaction is found to depend weakly on the luminosity of components, but is correlated with galaxy morphological type. The distribution of the 361 pairs with respect to total luminosity and component separation is given, and the effects of observational selection on this diagram are assessed. It is noted that if the cosmological deceleration parameter is not greater than 1.5, the orbital periods of all pairs do not exceed the age of the universe.

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