The diffuse soft excess emission in the Coma cluster from the ROSAT All-Sky Survey

Abstract

RASS data near the North Galactic Pole was analyzed in order to study the large-scale distribution of soft X-ray emission from the Coma cluster. These RASS data constitute the only available X-ray observations of Coma that feature an in situ -- temporally and spatially contiguous -- background, with unlimited and continuous radial coverage. These unique characteristics of the RASS data are used to deliver a final assessment on whether the soft excess previously detected in the Coma cluster is due to background subtraction errors, or not. This paper confirms the presence of soft X-ray excess associated with Coma, and reports the detection of 1/4 keV band excess out to 5 Mpc from the cluster center, the largest soft excess halo discovered to date. We propose that the emission is related to filaments that converge towards Coma, and generated either by non-thermal radiation caused by accretion shocks, or by thermal emission from the filaments themselves.

ApJ in press, 6 pages, emulateapj style

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Cited by in corpus (16)

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• Turbulence and Particle Acceleration in Giant Radio Haloes: the Origin of Seed Electrons
• A 3.55 keV Photon Line and its Morphology from a 3.55 keV ALP Line
• Searching for a 0.1-1 keV Cosmic Axion Background
• Planck intermediate results. X. Physics of the hot gas in the Coma cluster
• Soft X-ray Excess in the Coma Cluster from a Cosmic Axion Background
• Chandra X-ray observations of Abell 1835 to the virial radius
• The Sunyaev-Zel'dovich effect in WMAP data
• The eROSITA view of the Abell 3391/95 field: Cluster Outskirts and Filaments
• The Swift BAT Perspective on Non-thermal Emission in HIFLUGCS Galaxy Clusters
• ALP Conversion and the Soft X-ray Excess in the Outskirts of the Coma Cluster
• A WHIM origin for the soft excess emission in the Coma cluster
• X-ray spectroscopy of Abell S1101 with Chandra, XMM-Newton and ROSAT: band-pass dependence of he temperature profile and soft excess emission
• Characterization of the warm--hot intergalactic medium near the Coma cluster through high--resolution spectroscopy of X Comae
• Particle Reacceleration by Turbulence and Radio Constraints on Multi-Messenger High-Energy Emission from the Coma Cluster
• X-ray emission in IllustrisTNG circum-cluster environments. II -- Possible origins of the soft X-ray excess emission