Physics – Space Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ysc..conf...58k&link_type=abstract
12th Young Scientists' Conference on Astronomy and Space Physics, held in Kyiv, Ukraine, April 19-23, 2005, Eds.: Simon, A.; Gol
Physics
Space Physics
Scientific paper
According to Sandage [1] and Lynden-Bell et al. [2], any sufficiently dense group or cluster of galaxies may be characterized by a spherical "zero-velocity surface", which separates the group as overdensity against the homogenius cosmic expansion. The radius of this sphere is related to the total mass of the group, and this allows to estimate the masses of the nearby groups using the latest observational data on the galaxies of the Local Volume derived from the HST. The difference from other similar works [3,4] is that in this investigation the position of centroid is varied between the two most bright and therefore massive galaxies of the group, while in the earlier works on the subject it was fixed (usually one of the galaxies was considered as a centroid). The true location of the centroid can be determined confidently by a number of characteristics and agrees with other considerations. The results are compared with those obtained by other methods. Besides this, the non-zero tangential velocity case was investigated. It is a common fact that the tangential velocities are not known for the vast majority of extragalactic objects. For this, random normally distributed velocities were assigned to the galaxies. The result is that the calculated position of the centroid has not been changed and the radius of zero-velocity surface has been changed slightly, while the dispersion of the data relative to the best-fit curve grows as dispersion of normal distribution.
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