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Large-scale gas dynamical processes affecting the origin and evolution of gaseous galactic halosObservations of galactic halo gas are consistent with an interpretation in terms of the galactic fountain model in which supernova heated gas in the galactic disk escapes into the halo, radiatively cools and forms clouds which fall back to the disk. The results of a new study of several large-scale gas dynamical effects which are expected to occur in such a model for the origin and evolution of galactic halo gas will be summarized, including the following: (1) nonequilibrium absorption line and emission spectrum diagnostics for radiatively cooling halo gas in our own galaxy, as well the implications of such absorption line diagnostics for the origin of quasar absorption lines in galactic halo clouds of high redshift galaxies; (2) numerical MHD simulations and analytical analysis of large-scale explosions ad superbubbles in the galactic disk and halo; (3) numerical MHD simulations of halo cloud formation by thermal instability, with and without magnetic field; and (4) the effect of the galactic fountain on the galactic dynamo.
Document ID
19930035048
Document Type
Conference Proceedings
Authors
Shapiro, Paul R. (Texas Univ. Austin, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: The interstellar disk-halo connection in galaxies (A93-18998 05-90)
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NGT-50519
Distribution Limits
Public
Copyright
Other