Journal Article

Feedback effects of aspherical supernova explosions on galaxies

Kenji Bekki, Toshikazu Shigeyama and Takuji Tsujimoto

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 428, issue 1, pages L31-L35
Published in print January 2013 |
Published online October 2012 | e-ISSN: 1745-3933 | DOI: http://dx.doi.org/10.1093/mnrasl/sls008

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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.

Keywords: stars: formation; supernovae: general; galaxies: abundances; galaxies: dwarf; galaxies: evolution

Journal Article.  3444 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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