Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66..121r&link_type=abstract
Astrophysics and Space Science, vol. 66, no. 1, Nov. 1979, p. 121-131.
Astronomy and Astrophysics
Astrophysics
5
Density Wave Model, High Temperature Gases, Interstellar Gas, Shock Heating, Spiral Galaxies, Supernovae, Galactic Structure, Gamma Rays, Milky Way Galaxy, Stellar Evolution
Scientific paper
Starting from the argument that the density wave theory of spiral structure is incompatible with the existence of a stationary very hot extended component of the interstellar gas, the paper develops a cyclic model, in which an interstellar gas of a temperature around 10,000 K is heated to roughly 1,000,000 K by type II supernovae resulting from enhanced star formation triggered by the density wave, and cools down again to 10,000 K after the supernova activity subsides to be ready for shock compression in the next sweep of the density wave pattern. The time scales for heating by supernovae and subsequent cooling turn out to be consistent with current density wave theory. The scenario proposed is corroborated by recent results on cosmic ray composition and gamma-ray observations.
Reinhardt Michael
Schmidt-Kaler Theodor
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