Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362l...1g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. L1-L4.
Astronomy and Astrophysics
Astronomy
17
Plasma Acceleration, Radio Sources (Astronomy), Synchrotron Radiation, Absorption Cross Sections, Astronomical Models, Electron Scattering, Extraterrestrial Radiation, Photons, Protons, Quasars, Relativistic Velocity
Scientific paper
A magnetized blob, containing relativistic electrons, can absorb, by the synchrotron process, low-frequency photons emitted by an underlying source. The momentum of the adsorbed photons can accelerate the blob to relativistic velocities. The final bulk Lorentz factor can be as large as required by observations of superluminal sources even if only the low-frequency part of the spectrum of a sub-Eddington central source is used for the acceleration process, and even if the blob contains an equal number of protons and electrons. This is mainly due to the large absorption cross section of the synchrotron process with respect to the electron scattering cross section, but partly because strongly aberrated photons are seen blueshifted in the rest frame of the blob and are less efficiently absorbed, reducing the importance of the braking force due to the radiation drag.
Bodo Gianluigi
Ghisellini Gabriele
Rees Martin J.
Trussoni Edoardo
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