Coulomb bremsstrahlung and cyclotron emissivity in hot magnetized plasmas

Details Coulomb bremsstrahlung and cyclotron emissivity in hot magnetized plasmas Coulomb bremsstrahlung and cyclotron emissivity in hot magnetized plasmas

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118...66n&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 66-74.

Astronomy and Astrophysics

Astrophysics

21

Bremsstrahlung, Cyclotron Radiation, Magnetic Stars, Pulsars, Stellar Magnetic Fields, X Ray Sources, Absorptivity, Gamma Ray Bursts, High Temperature Plasmas, Landau Factor, Line Spectra, Neutron Stars, Stellar Spectra

Scientific paper

The population of Landau levels for electrons in pulsar magnetic fields is examined using a simplified two level model as part of an investigation of the formation of cyclotron lines in spectra of X-ray pulsars and gamma-ray bursts. The population of the level in the outermost radiating layers is non-LTE, similar to the situation in stellar atmospheres, and is determined by the number of line photons diffusing from the interior. The medium emissivity is related to the free-free absorption coefficient using an equivalent Kirchoff law, and the resonant part of this emissivity gives the cyclotron emissivity, which can be less than its usual LTE value. The free-free emission and absorption coefficients are anisotropic and polarization dependent in the continuum. A qualitatively new resonance behavior in the bremsstrahlung coefficients is found in the contribution from electrons occupying excited Landau levels, with quantum numbers n greater than or equal to 1.

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