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Cosmic Ray Production of 6Li by Virialisation Shocks in the Early Milky Way

Published online by Cambridge University Press:  05 March 2013

Takeru K. Suzuki  and
Susumu Inoue
Takeru K. Suzuki*
Affiliation:
Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
Susumu Inoue
Affiliation:
Max-Planck-Institut für Astrophysik, 85741 Garching, Germany
*
3E-mail: stakeru@tap.scphys.kyoto-u.ac.jp
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Abstract

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The energy dissipated by virialisation shocks during hierarchical structure formation of the Galaxy can exceed that injected by concomitant supernova (SN) explosions. Cosmic rays (CRs) accelerated by such shocks may therefore dominate over SNe in the production of 6Li through α + α fusion without co-producing Be and B. This process can give a more natural account of the observed 6Li abundance in metal-poor stars compared to standard SN CR scenarios. Future searches for correlations between the 6Li abundance and the kinematic properties of halo stars may constitute an important probe of how the Galaxy and its halo formed. Furthermore, 6Li may offer interesting clues to some fundamental but currently unresolved issues in cosmology and structure formation on sub-galactic scales.

Keywords

cosmic raysGalaxy: formationGalaxy: haloGalaxy: kinematics and dynamicsnuclear reactions, nucleosynthesisstars: abundances
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 148 - 152
Copyright
Copyright © Astronomical Society of Australia 2004

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