A Reanalysis of Small Scale Velocity Dispersion in the CfA1 Survey

Abstract

The velocity dispersion of galaxies on scales of $r\sim 1h^{-1}$ Mpc, ${\sigma }_{12}(r)$, may be estimated from the anisotropy of the galaxy-galaxy correlation function in redshift space. We present a reanalysis of the CfA1 survey, correct an error in the original analysis of Davis and Peebles (1983), and find that ${\sigma }_{12}(r)$ is extremely sensitive to the details of how corrections for infall into the Virgo cluster are applied. We conclude that a robust value of ${\sigma }_{12}$ cannot be obtained from this survey. We also discuss results from other redshift surveys, including the effect of removing clusters.

12 pages, uuencoded(latex file + 2 Postscript figures), uses aas macros

References in corpus (1)

• PAIRWISE VELOCITIES OF GALAXIES IN THE CFA AND SSRS2 REDSHIFT SURVEYS

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