Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..315s&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 315-321.
Astronomy and Astrophysics
Astrophysics
46
Acoustic Propagation, Interstellar Gas, Shock Wave Propagation, Stellar Envelopes, Supernova Remnants, Gas Temperature, Hydrodynamics, Mach Number, Magnetoacoustic Waves, Shock Wave Attenuation, Stellar Evolution
Scientific paper
When the Mach number of a supernova shock wave, propagating through the hot interstellar gas, is less than the critical value 2.76, the interaction of the shock with an interstellar cloud produces a reflected pressure pulse that propagates away from the cloud as an acoustic wave. A preliminary analysis indicates that about 4% of the energy of an exploding supernova shell is converted into such waves. When the postshock gas temperature exceeds 2 x 10 to the 6th K, waves as short as 6 pc are damped in less than a wavelength, returning the energy to the hot gas. Longer waves, especially at late stages, are less strongly damped, and are superposed in the hot gas to create a fluctuating magnetoacoustic field, with typical periods of about 100,000 years. In the warm neutral clouds at temperatures of about 8000 K these waves are rapidly damped by plasma slip (ambipolar diffusion), providing a heat source that may account for the temperatures of these clouds.
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