Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-12-31
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
11 pages, 4 Postscript figures; The Report on the International Conference on Physics of Neutron Stars, Saint-Petersburg, Russ
Scientific paper
Pulsars are the fast rotating neutron stars with strong magnetic field emitting over a wide frequency range. In spite of the efforts during 40 years after the discovery of pulsars, the mechanism of their radio emission remains to be unknown so far. We propose a new approach to solving this problem. The object of our study is a sample of pulsars with a high-frequency break of the spectrum from Pushchino catalogue. A theoretical explanation of the observed dependence of the high-frequency break from the pulsar period is given. The dependence of the break position from the magnetic field is predicted. This explanation is based on a new mechanism for electron emission in the inner polar gap. Radiation occurs when electrons are accelerated in the electric field rising from zero at the star surface. Acceleration passes through a maximum and tends to zero when the electron velocity approaches the velocity of light. The all radiated power is allocated to the radio band. The averaging over the polar cap, with some natural assumptions of the coherence of the radiation, leads to the observed spectra, as well as to an acceptable estimate of the power of radio emission. The same process responsible for the high-frequency break explains the disappearance of the main pulse of the Crab pulsar in this frequency range, as well as increasing of the interpulse amplitude.
Flanchik Alexander B.
Kontorovich Victor M.
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