On the cyclo-synchrotron cross-section

Details On the cyclo-synchrotron cross-section On the cyclo-synchrotron cross-section

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280.1094g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 4, pp. 1094-1100.

Astronomy and Astrophysics

Astronomy

1

Magnetic Fields, Radiation Mechanisms: Nonthermal

Scientific paper

The study of the synchrotron and cyclotron absorption processes and their relative cross-sections, recently analysed by Ghisellini & Svensson, is extended to the case of photons propagating along the direction of the magnetic field. In the relativistic regime we follow a quantum approach, which requires first the derivation of the particle emissivity for the assumed configuration. The expression for the cross-section coincides with that obtained through a classical treatment of the problem in the non-relativistic regime. In the frequency range where absorption is important, the cross-section is larger than the Thomson cross-section by several orders of magnitude, implying a strong coupling between radiation and magnetized plasma. The possible atrophysical implications of this process are briefly discussed; in particular, in a magnetized plasma the Eddington luminosity for synchrotron interaction can be much lower than the standard value.

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