Dark Matter Subhalos and the X-ray Morphology of the Coma Cluster
Felipe Andrade-Santos, Paul E. J. Nulsen, Ralph P. Kraft, William R., Forman, Christine Jones, Eugene Churazov, Alexey Vikhlinin

TL;DR
This study models the impact of dark matter subhalos on the X-ray morphology of the Coma Cluster, using lensing data and X-ray observations to constrain subhalo properties and their locations.
Contribution
Introduces a simple gasless subhalo model that effectively explains X-ray features and constrains subhalo masses and positions in the Coma Cluster.
Findings
Model accurately reproduces X-ray morphology of the Coma Cluster.
Lensing and X-ray data agree on subhalo masses (~10^13 solar masses).
Subhalos NGC 4889 and NGC 4874 are near the cluster center.
Abstract
Structure formation models predict that clusters of galaxies contain numerous massive subhalos. The gravity of a subhalo in a cluster compresses the surrounding intracluster gas and enhances its X-ray emission. We present a simple model, which treats subhalos as slow moving and gasless, for computing this effect. Recent weak lensing measurements by Okabe et al. have determined masses of ~ 10^13 solar masses for three mass concentrations projected within 300 kpc of the center of the Coma Cluster, two of which are centered on the giant elliptical galaxies NGC 4889 and NGC 4874. Adopting a smooth spheroidal beta-model for the gas distribution in the unperturbed cluster, we model the effect of these subhalos on the X-ray morphology of the Coma Cluster, comparing our results to Chandra and XMM-Newton X-ray data. The agreement between the models and the X-ray morphology of the central Coma…
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