The flat density profiles of massive, and relaxed galaxy clusters

The present paper is an extension and continuation of Del Popolo which studied the role of baryon physics on clusters of galaxies formation. In the present paper, we studied by means of the SIM introduced in Del Popolo (2009), the total and DM density profiles, and the correlations among different q...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2014-07, Vol.2014 (7), p.i-25
Main Author: Del Popolo, A
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARYONS
Clusters
CORRELATIONS
Cosmology
DENSITY
ERRORS
Friction
Galactic clusters
GALAXY CLUSTERS
MASS
MASS DISTRIBUTION
NONLUMINOUS MATTER
Slopes
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Summary:The present paper is an extension and continuation of Del Popolo which studied the role of baryon physics on clusters of galaxies formation. In the present paper, we studied by means of the SIM introduced in Del Popolo (2009), the total and DM density profiles, and the correlations among different quantities, observed by Newman et al., in seven massive and relaxed clusters, namely MS2137, A963, A383, A611, A2537, A2667, A2390. As already found in Del Popolo 2012a, the density profiles depend on baryonic fraction, angular momentum, and the angular momentum transferred from baryons to DM through dynamical friction. In simple terms, the large scatter in the inner slope from cluster to cluster, and the anti-correlation among the slope, alpha and Re is due to the fact that in order to have a total mass density profile which is NFW-like, clusters having more massive BCGs at their centers must contain less DM in their center. Consequently the inner profile has a flatter slope.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2014/07/019