A Reanalysis of Small‐Scale Velocity Dispersion in the CfA1 Survey | Zendy

Rachel S. Somerville | Zendy; Marc Davis | Zendy; Joel R. Primack | Zendy

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A Reanalysis of Small‐Scale Velocity Dispersion in the CfA1 Survey

Author(s) -

Rachel S. Somerville,

Marc Davis,

Joel R. Primack

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/303899

Subject(s) - velocity dispersion , galaxy , physics , virgo cluster , correlation function (quantum field theory) , astrophysics , scale (ratio) , dispersion (optics) , anisotropy , redshift , redshift survey , function (biology) , statistical physics , space (punctuation) , statistics , galaxy cluster , mathematics , optics , quantum mechanics , computer science , dielectric , evolutionary biology , biology , operating system

The velocity dispersion of galaxies on scales of $r\sim1h^{-1}$ Mpc,$\sigma_{12}(r)$, may be estimated from the anisotropy of the galaxy-galaxycorrelation function in redshift space. We present a reanalysis of the CfA1survey, 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 howcorrections for infall into the Virgo cluster are applied. We conclude that arobust value of $\sigma_{12}$ cannot be obtained from this survey. We alsodiscuss results from other redshift surveys, including the effect of removingclusters.Comment: 12 pages, uuencoded(latex file + 2 Postscript figures), uses aas macro

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