Constraints on Particle Acceleration from the Diffuse Isotropic Gamma-Ray Background

Abstract

Gamma rays trace accelerated particles, and the observed flux of extragalactic gamma rays therefore constrains the global efficiency for particle acceleration. Extragalactic jets in active galactic nuclei can account for the gamma ray background if their particle acceleration efficiency considerably exceeds ~ 18 per cent which would imply that particle acceleration is an essential part of the thermodynamics in these sources.

9 pages, 3 figures

References in corpus (3)

• Galactic Cosmic Rays from Supernova Remnants: II Shock Acceleration of Gas and Dust
• Possible Production of High-Energy Gamma Rays from Proton Acceleration in the Extragalactic Radio Source Markarian 501
• Comparison of the COBE FIRAS and DIRBE Calibrations