Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401...87g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 87-98.
Astronomy and Astrophysics
Astrophysics
5
Active Galactic Nuclei, Extragalactic Radio Sources, Relativistic Plasmas, Synchrotron Radiation, Electron Energy, Light Speed, Particle Interactions, Quasars
Scientific paper
The superluminal motion detected in several AGNs suggests outflow of radio-emitting clouds moving with Lorentz factors of 5-10. Recently Ghisellini et al. (1990) suggested that highly relativistic velocities can be attained by a cloud of synchrotron-emitting electrons opaque for synchrotron absorption to low-frequency photons emitted by an underlying source. In this paper we analyze in detail this model by studying the motion of a magnetized cloud of relativistic electrons optically thin (for synchrotron absorption) to the nonthermal radiation emitted by a source in the inner core of an AGN. The basic interaction between the particles and photons is the synchrotron absorption. The synchrotron cross section, which depends on the energies of the interacting photons and particles, can be much larger than the classical Thomson cross section; therefore the acceleration process is very efficient. The integration of the relativistic equation of motion of the cloud in the radiation field provides asymptotic Lorentz factors larger than about 10.
Bodo Gianluigi
Ghisellini Gabriele
Trussoni Edoardo
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