Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193...19k&link_type=abstract
Astrophysical Journal, vol. 193, Oct. 1, 1974, pt. 1, p. 19-25. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astrophysics
8
Galactic Clusters, Gravitational Effects, Red Shift, Tides, Virial Theorem, Astronomical Photometry, Galactic Radiation, Galactic Rotation, Radial Distribution, Stellar Gravitation
Scientific paper
The distortion of the brightness distributions of galaxies in clusters by gravitational tidal forces from their neighbors is employed as an indicator of galaxy membership in small groups or clusters. The presence or absence of tidal distortion in a galaxy's luminosity profile at radii comparable to its projected separation from nearby objects is investigated to clear up some apparent redshift discrepancies in clusters. New redshift measurements are listed for seven objects in VV 166; application of the virial theorem shows that the presence of the questionable elliptical galaxy NGC 68 makes a difference of a factor of 2-4 in the mass/light ratio for the system. Isophotes for the cluster region and a radial light distribution westward from NGC 68 are determined. These data are then used to dispute the membership of NGC 68 in VV 166.
Kormendy John
Sargent Wallace L. W.
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