The problem of motions in systems of galaxies

Details The problem of motions in systems of galaxies The problem of motions in systems of galaxies

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976azh....53..112f&link_type=abstract

Astronomicheskii Zhurnal, vol. 53, no. 1, 1976, p. 112-118. In Russian.

Mathematics

Logic

3

Galactic Clusters, Stellar Luminosity, Stellar Mass, Astronomical Models, Error Analysis, Radial Velocity

Scientific paper

The mass-luminosity (M/L) ratios in pairs of galaxies and in the Coma cluster are discussed. It is shown that the M/L ratio in double galaxies corresponds to the expected value without resorting to hidden mass, provided radial-velocity errors are taken into account and optical pairs of galaxies are excluded. It is argued that the Coma cluster contains a considerable admixture of extraneous galaxies. Evidence in favor of this includes the dependence of mean radial velocity on morphological type and the asymmetry of the velocity distribution relative to the cluster center. It is concluded that since the existence of extraneous galaxies has not been taken into account, the claim that there is a significant amount of hidden mass in the Coma cluster is premature.

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