Explosion of very massive stars and the origin of intermediate mass black holes

We calculate evolution, collapse, explosion, and nucleosynthesis of Population III very massive stars with 500 M_⊙ and 1000 M_⊙. It was found that both 500 M_⊙ and 1000 M_⊙ models enter the region of pair-instability but continue to undergo core collapse to black holes. For moderately aspherical explosions, the patterns of nucleosynthesis match the observational data of intergalactic and intercluster medium and hot gases in M82, better than models involving hypernovae and pair instability supernovae.