Computer Science – Sound
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89...67s&link_type=abstract
Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 67-69.
Computer Science
Sound
2
Density Wave Model, Galactic Structure, Interstellar Gas, Shock Wave Interaction, Sound Propagation, Spiral Galaxies, Acoustic Velocity, Shock Waves
Scientific paper
The effective speed of sound in a binary gas-mixture is calculated by taking into account the presence of a very hot gas component (about 700,000 K) in the complex interstellar medium. It is found that in the long wave approximation, valid for spiral density waves, the sound velocity increases to a mean value of about 16 km/s. The resulting effective speed of sound leads to a kinematical life-time of spiral waves of 6 x 10 to the 8th yr and provides the possibility of strong shocks even in the presence of an extended very hot gas component.
Schmidt-Kaler Theodor
Wiegandt R.
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