Extragalactic MeV gamma-ray emission from cocoons of young radio galaxies

Details Extragalactic MeV gamma-ray emission from cocoons of young radio galaxies Extragalactic MeV gamma-ray emission from cocoons of young radio galaxies

2006-11-29

arxiv.org/abs/astro-ph/0611870v1

Mon.Not.Roy.Astron.Soc.376:1630-1634,2007

Astronomy and Astrophysics

Astrophysics

5pages, 1figure, MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2007.11354.x

Strong $\gamma$-ray emission from cocoons of young radio galaxies is newly predicted. Considering the process of adiabatic injection of the shock dissipation energy and mass of the relativistic jet in active nuclei (AGNs) into the cocoon, while assuming thermalizing electron plasma interactions, we find that the thermal electron temperature of the cocoon is typically predicted in $\sim$MeV, which is determined only by the bulk Lorentz factor of the relativistic 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.

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