Individual and orbital masses of double galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Galactic Mass, Galactic Structure, Radio Galaxies, Astronomical Catalogs, Centimeter Waves, Halos, Histograms, Line Spectra

Scientific paper

A list is given of individual estimates of the masses of 124 components of isolated pairs of galaxies from Turner's catalog for which there are published data on the velocity dispersions in the central parts of the galaxies, on the width of the 21-cm radio line profile, and on the amplitude of the rotation curve of the galaxies. From the comparison of the orbital estimates of the mass with the sum of the individual masses of the double galaxies it is concluded that the bulk of the mass of the galaxies is situated within their standard optical diameter A(25). The considered observational data for the Turner galaxy pairs do not contain any arguments for the hypothesis of massive halos. Good agreement between the orbital and individual estimates of the mass is observed for almost circular motions of the galaxies in pairs with mean orbital eccentricity 0.25.

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