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

Published online by Cambridge University Press:  12 April 2016

Charles D. Dermer  and
Reinhard Schlickeiser
Charles D. Dermer
Affiliation:
E. O. Hulburt Center for Space Physics, Code 7653, Naval Research Laboratory, Washington, DC 20375-5352
Reinhard Schlickeiser
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn 1, Germany

Abstract

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Compton scattering of external radiation by nonthermal particles in outflowing blazar jets is dominated by accretion-disk photons rather than scattered radiation to distances ~ 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 ~ 102 - 103 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.

Subject headings: acceleration of particles — BL Lacertae objects: general — galaxies: jets — gamma rays: theory — radiation mechanisms: nonthermal

Type
Active Galaxies and Quasi-Stellar Objects
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 945 - 948
Copyright
Copyright © The American Astronomical Society 1994

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