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Multiple Supernova Explosions in a Forming Galaxy

Published online by Cambridge University Press:  05 March 2013

Masao Mori ,
Masayuki Umemura  and
Andrea Ferrara
Masao Mori*
Affiliation:
Institute of Natural Sciences, Senshu University, Kawasaki, Kanagawa, 214-8580, Japan
Masayuki Umemura
Affiliation:
Center for Computational Physics, University of Tsukuba, Tsukuba, Ibaraki, 305-8577, Japan
Andrea Ferrara
Affiliation:
SISSA/International School for Advanced Studies, 34014 Trieste, Italy
*
4E-mail: mmori@isc.senshu-u.ac.jp
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Abstract

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Ultra-high resolution hydrodynamic simulations using 10243 grid points are performed of a very large supernova burst in a forming galaxy, with properties similar to those inferred for Lyman Break Galaxies (LBGs). Explosions produce kpc-sized expanding hot bubbles enclosed by cool, dense shells, and the engulfed gas is polluted with freshly-synthesised heavy elements. We show that the resultant inhomogeneous mixing produces a large spread ([Fe/H] ≈ –1 to –5) of metallicities, which affects the subsequent galactic chemical evolution and leaves its imprint on metal-poor stars. By combining a spectral synthesis model with the numerical results, we predict Lyα emission from such galaxy at z = 3. We find that the simulated galaxy, whose peak star formation rate is ≈200 M⊙ yr–1, produces a Lyα luminosity Lα = 9.7 × 1042 erg s–1. This value favorably matches the observed one, but some discrepancies are left for the Lyα line width, the metallicity, and X-ray properties. Since the results of the simulation is applicable only at the very early epoch of the galaxy formation, the metallicity is still lower than that of LBGs. However, the analysis presented here demonstrates a way to enable a systematic comparison with observational data.

It is concluded that LBGs are optimal objects to scrutinise the early self-enrichment in forming galaxies. In the future, the predicted bubbly structure carved by SNe may be directly detected by high resolution observations with JWST.

Keywords

cosmology: theorygalaxies: formationgalaxies: high-redshiftgalaxies: starbursthydrodynamicsstars: Population IIsupernovae: general
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 232 - 236
Copyright
Copyright © Astronomical Society of Australia 2004

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