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Interstellar density fluctuations and the disparity between the optical and X-ray velocities of supernova remnantsстатья
- Авторы: Bychkov K.V., Pikelner S.B.
- Журнал: SOVIET ASTRONOMY LETTERS
- Том: 1
- Год издания: 1975
- Первая страница: 14
- Последняя страница: 16
- Аннотация: A mathematical model is examined which can account for the different velocities obtained from optical and X-ray measurements of SNRs. In this model, the X-ray emission originates in hot gas behind a shock front created by the dispersion of a remnant, and the optical emission is caused by those parts of the shock front located at a given time inside density fluctuations, which are small clouds 5 to 10 times denser than the interstellar medium. It is shown that the velocity of the shock wave within a fluctuation determines the width of emission lines, while the average Doppler velocity of a filament (which is much less than the shock-wave velocity) depends on the asymmetry of a converging shock wave. Data for Pup A, the Cygnus Loop, IC 443, and Vel X are reviewed in the framework of this model.
- Добавил в систему: Бычков Константин Вениаминович