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High energy emission from AGN cocoons in clusters of galaxies

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arxiv 0901.2968 v1 pith:7TEGHAVZ submitted 2009-01-20 astro-ph.GA

High energy emission from AGN cocoons in clusters of galaxies

classification astro-ph.GA
keywords cocoonscocoonemissionenergyfindgalaxiespredictedthermal
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Gamma-ray emission from cocoons of young radio galaxies is predicted. Considering the process of adiabatic injection of the shock dissipation energy and mass of the relativistic jet into the cocoon, we find that the thermal electron temperature of the cocoon is typically predicted to be of the order of $\sim$ MeV, and is determined only by the bulk Lorentz factor of the jet. Together with the time-dependent dynamics of the cocoon expansion, we find that young cocoons can yield thermal Bremsstrahlung emissions at energies $\sim$MeV. Hotter cocoons (i.e., GeV) for younger sources are also discussed.

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