Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..366k&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 1, 1980, p. 366-372. Research supported by the Alfred P. Sloan Foundation.
Astronomy and Astrophysics
Astrophysics
19
Astrodynamics, Galactic Clusters, Galactic Rotation, Red Shift, Astronomical Spectroscopy, Luminosity, Photometry, Radial Velocity, Virial Theorem
Scientific paper
New spectroscopic observations of the Shahbazian 1 group of galaxies have been obtained with the digital spectrograph at the 5 m Hale telescope. From velocity differences between galaxies in the cluster and the virial theorem, a mass-to-light ratio, in the V band, of 111 plus or minus 15 has been derived. The internal velocity dispersions of three galaxies in the group have been measured. They are consistent with those of ordinary elliptical galaxies of comparable luminosity. This new spectroscopic evidence, coupled with recent photometric work, points to the conclusion that the group is composed of ordinary galaxies, contrary to earlier interpretations. The group is, however, extraordinary in the sense that it is about as dense as the center of the coma cluster, and that dynamical interactions which are typical of rich clusters may have been important in the history of Shahbazian 1.
Kirshner Robert P.
Malumuth Eliot M.
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