Photoabsorption of Gamma Rays in Relativistic Jets

Details Photoabsorption of Gamma Rays in Relativistic Jets Photoabsorption of Gamma Rays in Relativistic Jets

2004-02-18

arxiv.org/abs/astro-ph/0402438v1

Astronomy and Astrophysics

Astrophysics

4 pages, in the Tenth Marcel Grossman Meeting on General Relativity, Rio de Janeiro, Brazil (July 20-26, 2003)

Scientific paper

A derivation of the \gamma\gamma --> e^+ e^- optical depth for \gamma rays produced in a comoving spherical emitting region is presented. Employing a simplified expression for the \gamma\gamma absorption cross section, analytic expressions for the minimum Doppler factor implied by the requirement of gamma-ray transparency are derived for a broken power-law spectrum of target photons which are isotropically distributed in the comoving frame. Application to specific systems is illustrated.

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