Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..136y&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 2, Sept. 1979, p. 136-147.
Astronomy and Astrophysics
Astrophysics
8
Cyclotron Radiation, High Temperature Plasmas, Mean Free Path, Photoabsorption, Photoelectric Emission, Pulsars, X Ray Sources, Boltzmann Transport Equation, Energy Transfer, Gauss Equation, Hamiltonian Functions, Landau Factor, Magnetoactivity, Momentum Transfer, Neutron Stars, Pencil Beams, Polar Caps, Radiation Distribution, Stellar Mass Accretion, X Ray Spectra
Scientific paper
The mean free path of a photon against absorption in a hot magnetoactive plasma is derived for given plasma conditions and photon parameters. It is assumed that the plasma electrons populate only the two lowest Landau states with a population ratio proportional to the Boltzmann factor and that the interaction Hamiltonian is nonrelativistic. The implication of cyclotron emission and absorption for energy and momentum exchange between the plasma and the radiation field is discussed, and explicit formulas are derived for the rate of energy and momentum exchange due to absorption and reemission. Some results are presented for the plasma conditions believed to exist in the polar cap of a magnetized neutron star. It is concluded that the observed flux from Her X-1 cannot emerge in a pencil-beam pattern, or else there would be no mass accretion onto the magnetic pole. The validity of the approximations used in deriving the mean-free-path function is briefly considered.
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