Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...463..555i&link_type=abstract
Astrophysical Journal v.463, p.555
Astronomy and Astrophysics
Astronomy
133
Acceleration Of Particles, Galaxies: Active, Galaxies: Jets, Gamma Rays: Theory, Radiation Mechanisms: Nonthermal
Scientific paper
The high-energy gamma rays from blazars detected by EGRET/CGRO are interpreted as photons that are inverse-Compton scattered by shock- accelerated electrons in jets. Within a simplified one-zone model framework, we calculate broadband blazar spectra utilizing electron distributions self-consistent with shock acceleration and radiative losses and with various sources of soft photons. Model fits to multi- wavelength data for selected blazars (3C 279 and Mrk 421) are presented. The source of soft photons may vary between individual objects or may be more than one within a single object. The maximum emitted gamma-ray energy is determined by the electron acceleration limit and/or pair absorption on the soft photons and is shown to be not far above the observed highest energies (~5 GeV for 3C 279 and ~5 TeV for Mrk 421). Some implications and suggestions concerning the physical state of the jet plasma are discussed, including the energy balance of the various components (likely to be particle dominated) and the nature of magnetic turbulence responsible for acceleration.
Inoue Susumu
Takahara Fumio
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