Interstellar density fluctuations and the disparity between the optical and X-ray velocities of supernova remnants

Details Interstellar density fluctuations and the disparity between the optical and X-ray velocities of supernova remnants Interstellar density fluctuations and the disparity between the optical and X-ray velocities of supernova remnants

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sval....1...14b&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 1, Jan. 1975, p. 29-34.) Soviet Astronomy Letters, vol. 1, Jan.-Feb. 1975, p.14-16. Tra

Astronomy and Astrophysics

Astronomy

24

Density Distribution, Doppler Effect, Interstellar Gas, Supernova Remnants, Velocity Distribution, X Ray Astronomy, Light Emission, Nebulae, Shock Wave Propagation, Stellar Motions, Stellar Radiation

Scientific paper

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.

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