Friday, December 7, 2012

1212.1157 (Alexander L. Muratov et al.)

Revisiting The First Galaxies: The epoch of Population III stars    [PDF]

Alexander L. Muratov, Oleg Y. Gnedin, Nickolay Y. Gnedin, Marcel Zemp
We investigate the transition from primordial Pop III star formation to normal Pop II star formation in the first galaxies using new cosmological hydrodynamic simulations. We find that while the first stars seed their host galaxies with metals, they cannot sustain significant outflows to enrich the intergalactic medium, even assuming a top-heavy initial mass function. This means that Pop III star formation could potentially continue until z~6 in different unenriched regions of the universe, before being ultimately shut off by cosmic reionization. Within an individual galaxy, Pop II stars overtake Pop III stars in 20-200 Myr, based on the amount of stellar feedback and metal production.
View original: http://arxiv.org/abs/1212.1157

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