The Density Contrast of the Shapley Supercluster

Abstract

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 M_tot=(4.4+-0.44)x10^{16} M_sun within a sphere of 50 Mpc centered at a distance of about 160 Mpc. The nonlinear fractional density contrast of the sphere is (1+delta)=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%) of the peculiar velocity of the local group.

10 pages, 5 figures, 1 table; submitted to MNRAS

References in corpus (6)

• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• SFI++ I: A New I-band Tully-Fisher Template, the Cluster Peculiar Velocity Dispersion and H0
• Is AGN feedback necessary to form red elliptical galaxies?
• Shapley Optical Survey II: The effect of environment on the colour-magnitude relation and galaxy colours
• Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
• Verifying the Identity of High-Redshift Massive Galaxies Through the Clustering of Lower Mass Galaxies Around Them

Cited by in corpus (4)

• Shapley Supercluster Survey (ShaSS): Galaxy Evolution from Filaments to Cluster Cores
• The Largest Gravitationally Bound Structures: The Corona Borealis Supercluster - Mass and Bound Extent
• Shapley Supercluster Survey: mapping the dark matter distribution
• The extent of gravitationally bound structure in a ΛCDM universe