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Astron. Astrophys. 337, 433-440 (1998)

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Synchrotron absorption in pulsar magnetospheres

Y.E. Lyubarskii and S.A. Petrova

Institute of Radio Astronomy, Chervonopraporna St.4, 310002 Kharkov, Ukraine

Received 5 January 1998 / Accepted 18 June 1998


Cyclotron absorption is known to be significant in pulsar magnetospheres. It is shown that when particles absorb significant fraction of pulsar radio emission, they acquire relativistic gyration. Therefore synchrotron absorption by relativistic plasma with small pitch-angles is considered. It is shown that both the frequency of the absorbed radiation and the absorption coefficient remain the same as in the cyclotron case provided that the angle the absorbed radiation makes with plasma velocity exceeds the pitch-angle. This condition holds if the absorbed energy is less than initial energy of plasma. Spontaneous reemission of the absorbed energy is considered. In short-period pulsars, a significant fraction of the absorbed energy is reemitted in the far infrared band.

Key words: plasmas – radiation mechanisms: non-thermal – stars: pulsars: general

© European Southern Observatory (ESO) 1998

Online publication: August 17, 1998