Superbubble blowout dynamics
Multiple supernovae and stellar winds from OB associations carve large holes filled with hot gas in the galactic disk. These superbubbles sweep up H I into cold, thin, dense shells and eventually grow large enough to blow completely out of the galactic H I disk. When superbubbles blow out of the disk, they vent hot gas and supernova energy into the galactic corona. In this paper ZEUS, a two-dimensional hydrodynamics code, is used to model the blowout of a superbubble from exponential and Gaussian models for the vertical density stratification. The results are compared to those from the Kompaneets (thin-shell) approximation. It is found that this approximation works very well, and that most of the mass of the shell remains in the plane, with 5 percent of it accelerating upward. The venting of the hot gas and the stability of the shell depends strongly on the model of the density distribution. It is suggested that the low galactic halo actually consists of a froth of merged superbubbles. 37 references.
- Research Organization:
- Joint Inst. for Lab. Astrophysics, Boulder, CO (USA); Colorado Univ., Boulder (USA); Illinois Univ., Champaign (USA)
- OSTI ID:
- 6394426
- Journal Information:
- Astrophys. J.; (United States), Vol. 337
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
INTERSTELLAR SPACE
BUBBLES
BLOWOUTS
COMPARATIVE EVALUATIONS
COSMIC GASES
DENSITY
FLOW VISUALIZATION
GALAXIES
H1 REGIONS
HYDRODYNAMIC MODEL
HYDRODYNAMICS
MASS
MORPHOLOGY
STELLAR WINDS
SUPERNOVAE
Z CODES
ACCIDENTS
COMPUTER CODES
COSMIC RADIO SOURCES
ERUPTIVE VARIABLE STARS
FLUID MECHANICS
FLUIDS
GASES
MATHEMATICAL MODELS
MECHANICS
PARTICLE MODELS
PHYSICAL PROPERTIES
SPACE
STARS
STATISTICAL MODELS
STELLAR ACTIVITY
THERMODYNAMIC MODEL
VARIABLE STARS
640105* - Astrophysics & Cosmology- Galaxies