Absorption of Magnetosonic Waves in the Crust of Neutron Stars. Radio Emission from Pulsars

The kinetic equation for plasma in the crust of neutron star is solved in the relaxation time approximation. Values of the kinetic coefficients are obtained for crust plasma? with densities in the range of 10 2 - 10 14 g/cm 3 . The propagation of magnetosonic waves in the crust of neutron star is ex...

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Bibliographic Details
Published in:Astrophysics 2014-12, Vol.57 (4), p.530-549
Main Authors: Sedrakian, D. M., Harutunyan, A. S., Hayrapetyan, M. V.
Format: Article
Language:English
Subjects:
Absorption
Astronomy
Astrophysics and Astroparticles
Astrophysics and Cosmology
Beams (radiation)
Crusts
Density
Magnetohydrodynamic waves
Neutron stars
Observations
Observations and Techniques
Physics
Physics and Astronomy
Pulsars
Radio emission
Radio waves
Relaxation time
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
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Summary:The kinetic equation for plasma in the crust of neutron star is solved in the relaxation time approximation. Values of the kinetic coefficients are obtained for crust plasma? with densities in the range of 10 2 - 10 14 g/cm 3 . The propagation of magnetosonic waves in the crust of neutron star is examined with various mechanisms for the dissipation of the wave energy taken into account. It is shown that the crust of neutron star are transparent for magnetosonic waves with frequencies ω ≤ 10 11 Hz and that the wave absorption is lower for stars with higher central densities. A mechanism for radio emission by pulsars is proposed in which the source is on the star’s surface and has dimensions equal to the cross section of the beam of magnetosonic waves. Some features of the radio emission (spectral index and pulsar cutoff) are explained.
ISSN:0571-7256
1573-8191
DOI:10.1007/s10511-014-9356-3