Low-temperature Galactic fountains
Creators
- 1. National Radio Astronomy Observatory, Charlottesville, VA (USA)
- 2. Virginia Univ., Charlottesville (USA)
Description
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. 39 refs
Additional details
Publishing Information
- Journal Title
- Astrophysical Journal
- Journal Volume
- 352
- Series
- Astrophys. J.
- Journal Page Range
- 506-521
- ISSN
- 0004-637X
- CODEN
- ASJOA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 21069556
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- ABSORPTION SPECTRA; COOLING; COSMIC GASES; HYDRODYNAMICS; INTERSTELLAR SPACE; MATHEMATICAL MODELS; MILKY WAY; MORPHOLOGICAL CHANGES; RAYLEIGH-TAYLOR INSTABILITY; ROTATION
- Descriptors DEC
- FLUID MECHANICS; FLUIDS; GALAXIES; GASES; INSTABILITY; MECHANICS; SPACE; SPECTRA