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A Reanalysis of small scale velocity dispersion in the CfA1 survey

Apr, 1996
12 pages
Published in:
  • Astrophys.J. 479 (1997) 616
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Abstract: (arXiv)
The velocity dispersion of galaxies on scales of r∼1h−1r\sim1h^{-1} Mpc, σ12(r)\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 σ12(r)\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 σ12\sigma_{12} cannot be obtained from this survey. We also discuss results from other redshift surveys, including the effect of removing clusters.