Feedback effects of aspherical supernova explosions on galaxies
Abstract
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 30 M⊙ 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 1051 and 1052 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 2013
- DOI:
- 10.1093/mnrasl/sls008
- arXiv:
- arXiv:1210.2475
- Bibcode:
- 2013MNRAS.428L..31B
- Keywords:
-
- stars: formation;
- supernovae: general;
- galaxies: abundances;
- galaxies: dwarf;
- galaxies: evolution;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 5 pages, 5 figures, accepted in MNRAS (Letters)