Angular momentum in cluster Spherical Collapse Model

Abstract

Our new formulation of the Spherical Collapse Model (SCM-L) takes into account the presence of angular momentum associated with the motion of galaxy groups infalling towards the centre of galaxy clusters. The angular momentum is responsible for an additional term in the dynamical equation which is useful to describe the evolution of the clusters in the non-equilibrium region which is investigated in the present paper. Our SCM-L can be used to predict the profiles of several strategic dynamical quantities as the radial and tangential velocities of member galaxies, and the total cluster mass. A good understanding of the non-equilibrium region is important since it is the natural scenario where to study the infall in galaxy clusters and the accretion phenomena present in these objects. Our results corroborate previous estimates and are in very good agreement with the analysis of recent observations and of simulated clusters.

8 pages, 4 figures, accepted for publication in MNRAS

References in corpus (5)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• CIRS: Cluster Infall Regions in the Sloan Digital Sky Survey I. Infall Patterns and Mass Profiles
• On the efficiency and reliability of cluster mass estimates based on member galaxies
• The spherical collapse model with shell crossing
• The Virgo Cluster

Cited by in corpus (4)

• Spherical collapse model with shear and angular momentum in dark energy cosmologies
• On the implementation of the spherical collapse model for dark energy models
• Effects of Rastall parameter on perturbation of dark sectors of the Universe
• The virialization density of peaks with general density profiles under spherical collapse