Journal Article

The density contrast of the Shapley supercluster

Joseph A. Muñoz and Abraham Loeb

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 3, pages 1341-1349
Published in print December 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI:
The density contrast of the Shapley supercluster

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We calculate the density contrast of the Shapley supercluster (SSC) based on the enhanced abundance of X-ray clusters in it using the extended Press–Schechter formalism. We derive a total SSC mass of Mtot= (4.4 ± 0.44) × 1016M within a sphere of 50 Mpc centred at a distance of about 160 Mpc. The non-linear fractional density contrast of the sphere is (1 +δ) = 1.76 ± 0.17 relative to the mean matter density in the Universe, but the contrast increases in the interior of the SSC. Including the cosmological constant, the SSC region is found to be gravitationally unbound. The SSC contributes only a minor portion (9.0 ± 2.1 per cent) of the peculiar velocity of the Local Group.

Keywords: Local Group; large-scale structure of Universe

Journal Article.  7134 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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