Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..346l&link_type=abstract
Astrophysical Journal v.452, p.346
Astronomy and Astrophysics
Astronomy
18
Radio Continuum: Stars, Scattering, Stars: Binaries: Eclipsing, Stars: Pulsars: General
Scientific paper
Induced scattering due to three-wave interactions in a magnetized plasma is proposed as a possible mechanism for pulsar eclipses. The highly beamed, intense radio emission from a pulsar car1 induce instability of low-frequency waves in the plasma of the companion wind. When a sufficient level of the low-frequency waves is built up, the photon beam is scattered by these waves, resulting in a pulsar eclipse. The scattering is considered in two regimes: small-angle scattering, in which the wavenumber of the low-frequency waves is much smaller than those of the high-frequency photons, and large-angle scattering, in which the wavenumbers of the three waves are comparable. For small-angle scattering, low-frequency z-mode waves are important, and for large-angle scattering, Bernstein waves are important. Both small-angle and large-angle scattering can result in pulsar eclipse, but large-angle scattering (or back-scattering) by Bernstein waves appears the more favored for a complete (continuum) or partial eclipse such as observed for PSR 1957+20 or PSR 1744-24A. In the case of PSR 1744- 24A, the frequency dependence of the eclipse radius estimated for three-wave scattering involving Berstein waves appears more consistent with the observations than for the theory involving Langmuir waves or z-mode waves.
Luo Qinghuan
Melrose Donald B.
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