Evolution of superbubble driven by sequential supernova explosions in a plane-stratified gas distribution
K. Tomisaka, S. Ikeuchi;
PASJ, 1986, 38, 697
ABSTRACT:The evolution of a superbubble driven by sequential explosions of supernovae in an OB
association is studied.
Particular attention is given to the effect of the
plane-stratified gas distribution in the direction perpendicular to the galactic
disk.
It is shown that the superbubble asymmetrically expands with respect to
the parallel and perpendicular directions to the disk.
In the case that
the density on the disk plane, n0, is about 1/cu cm, it is found that the
cooled shell surrounds the hot cavity like an egg shape.
On the other hand, in a
low-density disk with n0 of about 0.1/cu cm, a cooled wall is formed only on the disk
plane side of the bubble and the hot gas flows up to the halo region.
This
corresponds to the H I worms pointed out by Heiles (1984).
It is shown that the hot gas
which is pushed up maintains the galactic hot gaseous halo.
KEYWORDS: b stars, galactic evolution, gas density, gravitational collapse, o stars, supernova remnants, density distribution, galactic structure, stellar mass ejection, strata
PERSOKEY:supershell, ,
CODE: tomisaka86