Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..945d&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 945-948
Astronomy and Astrophysics
Astronomy
92
Bl Lacertae Objects, Compton Effect, Gamma Ray Astronomy, Particle Acceleration, Plasma Jets, Stellar Models, Coherent Scattering, Electron Energy, Energy Dissipation, Gamma Ray Telescopes, Nonthermal Radiation, Photons
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 approximately 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 Energetic Gamma Ray Experiment Telescope (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 approximately 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.
Dermer Charles D.
Schlickeiser Reinhard
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