The spatial covariance function for rich clusters of galaxies

Details The spatial covariance function for rich clusters of galaxies The spatial covariance function for rich clusters of galaxies

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9...75k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 9, Feb. 1983, p. 75-81) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, Jan.-Feb. 19

Astronomy and Astrophysics

Astronomy

22

Galactic Clusters, Red Shift, Covariance, Distance, Spatial Distribution, Stellar Evolution

Scientific paper

The volume covariance functions for a sample of 158 Abell clusters representing all richness classes has been calculated. The results indicate that in the range 5-100 Mpc the covariance function for rich clusters of galaxies conforms to a power law xi(r) = (r(0)/r) to the gamma power, with r(0) = 40-50 Mpc and gamma = 1.3-1.9. From present data it is hard to obtain a trustworthy estimate for xi beyond 100 Mpc, but there are signs that when r is greater than about 100 Mpc xi will become negative. The cluster covariance function differs markedly from the one determined by galaxies: for r = 10 Mpc the galaxy covariance function equals 0.5-1, while the cluster covariance function is about 20 times as large. The generally unsatisfactory theoretical attempts to account for the observed cluster covariance function are briefly discussed.

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