Feedback effects of aspherical supernovae explosions on galaxies
  We investigate how explosions of aspherical supernovae (A-SNe) can influence
star formation histories and chemical evolution of dwarf galaxies by using a
new chemodynamical model. We mainly present the numerical results of two
comparative models so that the A-SN feedback effects on galaxies can be more
clearly seen. SNe originating from stars with masses larger than 30M_sun are
A-SNe in the "ASN" model whereas all SNe are spherical ones (S-SNe) in the
"SSN" model. Each S-SN and A-SN are assumed to release feedback energy of
10^{51} erg and 10^{52} erg, respectively, and chemical yields and feedback
energy of A-SN ejecta depend on angles between the axis of symmetry and the
ejection directions. We find that star formation can become at least by a
factor of ~3 lower in the ASN model in comparison with the SSN one owing to the
more energetic feedback of A-SNe. As a result of this, chemical evolution can
proceed very slowly in the ASN model. A-SN feedback effects can play a
significant role in the formation of giant gaseous holes and energetic gaseous
outflow and unique chemical abundances (e.g., high [Mg/Ca]). Based on these
results, we provide a number of implications of the A-SN feedback effects on
galaxy formation and evolution.
