Other
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..701w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, May 1983, p. 701-725. Research supported by the Ca
Other
120
Celestial Mechanics, Galactic Clusters, Mass To Light Ratios, Radial Velocity, Two Body Problem, Elliptical Galaxies, Galactic Structure, Luminosity, Mass Distribution, Monte Carlo Method, Orbital Mechanics, Root-Mean-Square Errors, Spiral Galaxies, Velocity Errors
Scientific paper
The single velocity measurement rms error value in the present set of radial velocities for all galaxies in the Turner (1976) catalog of 156 binary systems is estimated t be 29 km/sec. Typical velocity differences are very small, with half of the 55 systems in the subsample of isolated spiral-spiral pairs (the most reliable set of 'pure' binaries) having measured velocity differences of less than 75 km/sec. By means of Monte Carlo simulations of scale-free ensembles of binary galaxies, it is possible to show that the present data's independence of either luminosity or projected separation is inconsistent both with the hypothesis that the mass of binary systems increases linearly with luminosity, and that galaxies in pairs may effectively be treated as point masses. The data favor models in which galaxies interact through a quasi-isothermal potential only weakly depending on luminosity.
Davis Martin
Huchra John
Latham Dave
White Simon D. M.
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