Clustered supernovae versus the gaseous disk and halo
C. Heiles;
ApJ, 1990, 354, 483
ABSTRACT:The effects of clustered supernovae on the two-dimensional porosity parameter Q(2D) and the rates M-dot of mass injection of both hot and cold gas into
the halo are reconsidered.
The effects of high-absolute value z,
low-density extension of the neutral gas layer are theoretically calculated and
the distribution of H-alpha luminosities of extragalactic H II regions is
observationally determined.
These results are used to estimate the birth rate of star
clusters having N supernovae as a function of N.
A Galaxy-wide average of Q(2D)
roughly 0.30 is obtained, corresponding to an area filling factor of
0.23.
Area filling factors and mass injection rates into the halo due to
breakthrough bubbles with large N are calculated for different types of galaxy.
The
calculations are related to the area covered by H I 'holes' and the area covered by
giant H II regions.
The effects of supernova clusters that are too small to
produce breakthrough bubbles are discussed.
KEYWORDS: galactic structure, star clusters, supernovae, h ii regions, interstellar matter, milky way galaxy, star formation rate, supernova remnants
PERSOKEY:h_i, h+, supershell, ,
CODE: heiles90