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Title:
Low-temperature Galactic fountains
Authors:
Houck, John C.; Bregman, Joel N.
Affiliation:
AA(Virginia, University, Charlottesville), AB(National Radio Astronomy Observatory, Charlottesville, VA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 506-521. Research supported by the National Radio Astronomy Observatory. (ApJ Homepage)
Publication Date:
04/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC STRUCTURE, INTERSTELLAR MATTER, NEUTRAL GASES, TAYLOR INSTABILITY, ABSORPTION SPECTRA, HALOS, HYDRODYNAMICS
DOI:
10.1086/168554
Bibliographic Code:
1990ApJ...352..506H

Abstract

Analytic and one- and two-dimensional hydrodynamic calculations are performed to determine whether or not the Galactic fountain model can explain observations of neutral gas in the Galactic halo. Galactic halo gasdynamics are examined, including thermal conduction, Galactic rotation, and Galactic fountains. Results are presented from numerical modeling of low-temperature Galactic fountains. It is found that the best reproduction of the observations is provided by a model near the transonic regime with a temperature and density at the base of the fountain of 300,000 K and 0.001/cu cm, respectively. The cooling time for the hot gas is 33 million yr and the time for newly formed clouds to return to the disk is 47 million yr, neglecting drag forces.

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