On the Detectability of Gamma Rays from Clusters of Galaxies: Mergers versus Secondary Infall

Abstract

Particle acceleration in clusters of galaxies is expected to take place at both merger and accretion shocks. The electron component may be energized to energies of several TeV, and upscatter a small fraction of the photons in the cosmic microwave background up to gamma ray energies. We address here the issue of the detectability of the gamma radiation generated either in merger events or during the accretion of matter onto cluster potential wells. The predictions are specialized to the cases of GLAST and AGILE, for which a few tens of clusters are expected to be detected, and to Cherenkov telescopes, for which however the perspectives do not appear to be optimistic.

20 pages, 3 figures

References in corpus (1)

• Cosmological Shock Waves and Their Role in the Large Scale Structure of the Universe

Cited by in corpus (25)

• Cosmic rays in galaxy clusters and their non-thermal emission
• GeV Gamma-ray Flux Upper Limits from Clusters of Galaxies
• The nature of the Diffuse Gamma-Ray Background
• Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
• Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of cosmic gamma-ray background
• Composition of the Fermi-LAT isotropic gamma-ray background intensity: Emission from extragalactic point sources and dark matter annihilations
• Probing the origin of giant radio halos through radio and gamma-ray data : the case of the Coma cluster
• Gamma rays from clusters of galaxies
• Constraints on Decaying Dark Matter from the Isotropic Gamma-Ray Background
• Hard X-ray and Gamma-ray Emission Induced by Ultra-High Energy Protons in Cluster Accretion Shocks
• Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark Matter
• Constraining dark matter annihilation with the isotropic $\gamma$-ray background: updated limits and future potential
• Angular power spectrum of gamma-ray sources for GLAST: blazars and clusters of galaxies
• Dissecting the Gamma-Ray Background in Search of Dark Matter
• The Coma Cluster at gamma-ray energies: multifrequency constraints
• Gamma-ray probe of cosmic-ray pressure in galaxy clusters and cosmological implications
• High Energy Neutrinos from Cosmic Ray Interactions in Clusters of Galaxies
• Detailed study of extended gamma-ray morphology in the vicinity of the Coma cluster with Fermi-LAT
• CANGAROO-III search for TeV Gamma-rays from two clusters of galaxies
• Cosmic Ray Acceleration during Large Scale Structure Formation
• Analytical Models for the Energetics of Cosmic Accretion Shocks, their Cosmological Evolution, and the Effect of Environment
• New results from H.E.S.S. observations of galaxy clusters
• Isotropic diffuse gamma-ray background: unveiling Dark Matter components beyond the contribution of astrophysical sources
• High-Energy Cosmology: gamma rays and neutrinos from beyond the galaxy
• The Contribution From TeV Halos to the Isotropic Gamma-Ray Background