Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ssrv...75..299s&link_type=abstract
Space Science Reviews, Volume 75, Issue 1-2, pp. 299-315
Computer Science
18
Gamma Rays &Mdash, Galaxies, Nuclei &Mdash, Galaxies, Active &Mdash, Radiation Processes &Mdash, Particle Acceleration
Scientific paper
It is argued that the high-energy X-ray and γ-ray emission from flaring blazars is beamed radiation from the relativistic jet supporting the relativistic beaming hypothesis and the unified scenario for AGNs. Most probably the high-energy emission results from inverse Compton scattering by relativistic electrons and positrons in the jet of radiation originating external to the jet plus pair annihilation radiation from the jet. Future positive TeV detections of EGRET AGN sources will be decisive to identify the prominent target photon radiation field. Direct γ-ray production by energetic hadrons is not important for the flaring phase in γ-ray blazars, but the acceleration of energetic hadrons during the quiescent phase of AGNs is decisive as the source of secondary electrons and positrons through photo-pair and photo-pion production. Injection of ultrahigh energy secondary electrons and positrons into a stochastic quasilinear acceleration scheme during the quiescent AGN phase leads to cooling electron-positron distribution functions with a strong cut-off at low but relativistic energy that under certain local conditions may trigger a plasma instability that gives rise to an explosive event and the flaring γ-ray phase.
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