The Nature of Gaseous Loops in the Milky way Halo

Details The Nature of Gaseous Loops in the Milky way Halo The Nature of Gaseous Loops in the Milky way Halo

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3706d&link_type=abstract

HST Proposal ID #3706

Physics

Hst Proposal Id #3706

Scientific paper

Recent evidence has shown that the nature of the gaseous halos of galaxies both depends upon and contributes to the nature of the underlying disk. "Galactic fountain" theories propose that hot gas produced in the disk rises to large scale height where it cools and flows back to the disk in a rain of cool clouds. Because of their anomolous negative velocities, the high latitude neutral hydrogen clouds are thought to be the returning gas in this halo circulation scheme. Most of the infalling gas is found in large, coherent loop-like structures toward the North Galactic Pole. We propose to study halo circulation by observing the kinematics and ionization balance the intermediate velocity clouds through absorption line observations of both high and low ionization species. By studying the ionization balance, we hope to determine the nature of the gas heating and cooling processes. Together with the kinematic information available through high spectral resolution GHRS data, we expect to be able to place severe constraints upon galactic circulation models.

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