On the Location of the Acceleration and Emission Sites in Gamma-Ray Blazars

Details On the Location of the Acceleration and Emission Sites in Gamma-Ray Blazars On the Location of the Acceleration and Emission Sites in Gamma-Ray Blazars

1993-12-21

arxiv.org/abs/astro-ph/9312052v1

Astronomy and Astrophysics

Astrophysics

LaTeX, 15 pages, no figures, accepted for publication in ApJ Supplements (IAU Sumposium 142), NRL-CD-93-007

Scientific paper

Compton scattering of external radiation by nonthermal particles in outflowing blazar jets is dominated by accretion-disk photons rather than scattered radiation to distances $\sim 0.01-0.1$ pc from the central engine for standard parameters, thus clarifying the limits of validity of the model by the present authors and the model of Sikora, Begelman, \& Rees. On the basis of contemporaneous Ginga X-ray and EGRET gamma-ray observations, we estimate the radius of 3C 279's gamma-ray photosphere to be smaller than estimated by Blandford. There is thus no need to require that the acceleration and emission sites of gamma-ray blazars to be located farther than $\sim 10^{2-3}$ gravitational radii from the central engine. We argue that lineless BL Lac objects, rather than quasars, are more likely to be detected in the TeV energy range.

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