Schedule Aug 17, 2007
Second-Generation Star Formation in Proto-Galaxies
Naoki Yoshida (Nagoya Univ.)

We present the results from cosmological hydrodynamic simulations of early structure formation in a LCDM universe. We study the so-called feedback effects from the first generation of stars. The first stars photo-ionize and heat the inter-galactic medium. They can also input energy by exploding as supernovae. These altogether cause a delay of star-formation in early proto-galaxies. We show that even a single massive star can delay/quench subsequent star-formation for several tens to a hundred million years. The thermal and chemical evolution of a photo-ionized gas differs significantly from that of an initially neutral primordial gas. We argue that massive, rather than very massive, primordial stars can be formed in early proto-galaxies. We discuss the role of heavy elements and dust in the formation process of second-generation stars.

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