A complete view of the outskirts of the Coma cluster

Abstract

We present a new extended XMM-Newton mosaic of the nearby Coma cluster, which covers the cluster out to the virial radius with nearly complete azimuthal coverage. This large mosaic is combined with the Planck Sunyaev Zel'dovich effect observations to recover the thermodynamic properties of the intracluster medium in an azimuthally averaged profile and 36 angular sectors, producing the highest spatial resolution view of the thermodynamics of the outskirts of a galaxy cluster in its entirety. Beyond $r_{500}$, our clumping corrected entropy measurements along the less disturbed directions are statistically consistent with the power-law entropy profile predicted by non-radiative simulations, and the gas mass fraction agrees with the mean cosmic baryon fraction. However, there is a clear entropy deficit in the outskirts to the southwest, coinciding with where Coma connects to a cosmic web filament which joins it to Abell 1367. The low entropy to the southwest extends from 0.5-1.0$r_{200}$, and is consistent with what is expected from simulations of a filamentary gas stream penetrating into the cluster as it continues to accrete matter from the cosmic web. We also find that the radial profiles of the recovered quantities become increasingly asymmetric in the outskirts, particularly along the more disturbed directions, consistent with the predictions of cosmological simulations.

18 pages, 22 figures, 1 table. Accepted for publication in MNRAS

References in corpus (6)

• Baryons at the Edge of the X-ray Brightest Galaxy Cluster
• Mass Accretion and its Effects on the Self-Similarity of Gas Profiles in the Outskirts of Galaxy Clusters
• Simulated X-ray galaxy clusters at the virial radius: slopes of the gas density, temperature and surface brightness profiles
• Like a spider in its web: a study of the Large Scale Structure around the Coma cluster
• Testing X-ray Measurements of Galaxy Cluster Outskirts with Cosmological Simulations
• Probing Macro-Scale Gas Motions and Turbulence in Diffuse Cosmic Plasmas

Cited by in corpus (4)

• The Coma cluster at LOFAR frequencies I: insights into particle acceleration mechanisms in the radio bridge
• Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius
• Gamma-ray detection toward the Coma cluster with Fermi-LAT: Implications for the cosmic ray content in the hadronic scenario
• Probing ultra-diffuse galaxies out to the virial radius of the Coma cluster with XMM-Newton