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PAIRWISE VELOCITIES OF GALAXIES IN THE CFA AND SSRS2 REDSHIFT SURVEYS | | R.O. Marzke
; M.J. Geller
; L.N. da Costa
; J.P. Huchra
; | | Date: |
20 Apr 1995 | | Journal: | Astron.J. 110 (1995) 477 | | Subject: | astro-ph | | Abstract: | (compressed version) We combine the CfA Redshift Survey (CfA2) and the Southern Sky Redshift Survey (SSRS2) to estimate the pairwise velocity dispersion of galaxies $sig12$ on a scale of $sim 1 hmpc$. Both surveys are complete to an apparent magnitude limit $B(0)=15.5$. Our sample includes 12,812 galaxies distributed in a volume $1.8 imes 10^6 hmpc3$. We conclude: 1) The pairwise velocity dispersion of galaxies in the combined CfA2+SSRS2 redshift survey is $sig12=540 kms pm 180 kms$. Both the estimate and the variance of $sig12$ significantly exceed the canonical values $sig12=340 pm40$ measured by Davis Peebles (1983) using CfA1. 2) We derive the uncertainty in $sig12$ from the variation among subsamples with volumes on the order of $7 imes 10^5$ hmpc3. This variation is nearly an order of magnitude larger than the formal error, 36 $kms$, derived using least-squares fits to the CfA2+SSRS2 correlation function. This variation among samples is consistent with the conclusions of Mo etal (1993) for a number of smaller surveys and with the analysis of CfA1 by Zurek etal (1994). 3) When we remove Abell clusters with $Rge1$ from our sample, the pairwise velocity dispersion of the remaining galaxies drops to $295 pm 99 kms$. Thus the dominant source of variance in $sig12$ is the shot noise contributed by dense virialized systems. 4) The distribution of pairwise velocities is consistent with an isotropic exponential with velocity dispersion independent of scale. | | Source: | arXiv, astro-ph/9504070 | | Services: | Forum | Review | PDF | Favorites | |
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