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.

arXiv comment10 pages, 5 figures, 1 table; submitted to MNRAS

References in corpus (20)

• Large scale bias and the peak background split
• Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
• An analytic model for the spatial clustering of dark matter haloes
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• Sample Variance Considerations for Cluster Surveys
• Galaxy Clusters in Hubble Volume Simulations: Cosmological Constraints from Sky Survey Populations
• Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
• 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?
• On The Origin of the Local Group's Peculiar Velocity
• Shapley Optical Survey II: The effect of environment on the colour-magnitude relation and galaxy colours
• The Shapley Supercluster. III. Collapse dynamics and mass of the central concentration
• On the mass distribution in the Shapley Supercluster inferred from X-ray observations
• Structure and dynamics of the Shapley Supercluster
• Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
• Conditional Mass Functions and Merger Rates of Dark Matter Halos in the Ellipsoidal Collapse Model
• Constrained Cluster Parameters from Sunyaev-Zel'dovich Observations
• The Shapley super-cluster. New X-ray detections and mass distribution
• Verifying the Identity of High-Redshift Massive Galaxies Through the Clustering of Lower Mass Galaxies Around Them
• Evolution of the Cluster Correlation Function

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