ar X iv : a st ro - p h / 05 07 59 3 v 2 9 M ay 2 00 6 Core - Collapse Very Massive Stars : Evolution ,

We calculate evolution, collapse, explosion, and nucleosynthesis of Population III very-massive stars with 500M⊙ and 1000M⊙. Presupernova evolution is calculated in spherical symmetry. Collapse and explosion are calculated by a two-dimensional code, based on the bipolar jet models. We compare the results of nucleosynthesis with the abundance patterns of intracluster matter, hot gases in M82, and extremely metal-poor stars in the Galactic halo. It was found that both 500M⊙ and 1000M⊙ models enter the region of pair-instability but continue to undergo core collapse. In the presupernova stage, silicon burning regions occupy a large fraction, more than 20% of the total mass. For moderately aspherical explosions, the patterns of nucleosynthesis match the observational data of both intracluster medium and M82. Our results suggest that explosions of Population III core-collapse very-massive stars contribute significantly to the chemical evolution of gases in clusters of galaxies. For Galactic halo stars, our [O/Fe] ratios are smaller than the observational abundances. However, our proposed scenario is naturally consistent with this outcome. The final black hole masses are ∼ 230M⊙ and ∼ 500M⊙ for the 500M⊙ and 1000M⊙ models, respectively. This result may support the view that Population III very massive Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 1130033, Japan; [email protected], [email protected], [email protected], [email protected] Department of Earth Science and Astronomy, graduate school of Arts and Sciences, University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo 153-8902, Japan; [email protected] Research Center for the Early Universe, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan Department of Physics, Montana State University, Bozeman, MT 59717-3840; [email protected] Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA, UK; [email protected]