Physics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988lnp...306..155n&link_type=abstract
The Outer Galaxy, Proceedings of a Symposium Held in Honor of Frank J. Kerr at the University of Maryland, College Park, May 28-
Physics
3
Background Radiation, Coronas, Disk Galaxies, Dynamo Theory, Halos, High Temperature Gases, Interstellar Matter, Quasars, Supernovae, Cooling, Momentum, X Rays
Scientific paper
Some results on the nature of the interstellar medium that are specifically concerned with the disk-halo interaction are discussed. Over the last five years or so it has become clear that the supernovae rate in our Galaxy is spatially clumped and the consequences of such clumping are superbubbles and supershells fed by tens or hundreds of supernovae per shell. These objects evolve and expand rapidly and soon break out of the disk of the Galaxy, feeding the halo with very significant mass, energy, and momentum. As cooling occurs, gas will rain down onto the disk of the Galaxy completing the cycle. The basic flow of physical quantities from disk to halo and vice versa are discussed. Some of the many implications are noted including aspects of dynamo theory, quasar absorption lines, the theory of galactic coronae, and the nature of the x ray background. The essential difference here with the McKee-Ostriker (1977) theory is that the filling factor of the hot gas in the disk is significantly less than unity.
Ikeuchi Satoru
Norman Colin A.
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