Spiral arms and a supernova-dominated interstellar medium

Details Spiral arms and a supernova-dominated interstellar medium Spiral arms and a supernova-dominated interstellar medium

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..545b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Feb. 1982, p. 545-562.

Astronomy and Astrophysics

Astronomy

8

Astronomical Models, Density Wave Model, Interstellar Matter, Kinematics, Shock Waves, Supernova Remnants, Galactic Structure, Gas Density, Molecular Clouds, Spiral Galaxies, Stellar Evolution

Scientific paper

Models of the interstellar medium (ISM) utilizing the large energy output of supernovae to determine the average kinematical properties of the gas, are subjected to an imposed (spiral) density wave. The consequent appearance of the ISM is considered. In particular the McKee-Ostriker model with cloud evaporation is used, but it is shown that the overall appearance of the galaxy model does not change significantly if a modification of Cox's mechanism, with no cloud evaporation, is incorporated. It is found that a spiral density wave shock can only be self-sustaining if quite restrictive conditions are imposed on the values of the galactic supernova rate and the mean interstellar gas density.

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