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The First Stars and Galaxies: Challenges for the Next Decade Participants
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Poster
Title: The Impact of Ultraviolet Radiation on Secondary Pop III Star Formation Author(s): Kenji Hasegawa Abstract: We explore radiation hydrodynamical feedback on the formation of second-generation Pop III stars using a newly-developed SPH scheme coupled with tree-based accelerated radiative transfer. Recent ultra high-resolution cosmological hydrodynamic simulations by Suwa et al found that dark matter cusps drive the collapse of 10^3 Msun primordial clouds. The separation between density peaks can be less than 100 pc. Therefore, it is expected that UV feedback by a Pop III star forming in the higher density peak severely affects the evolution of the lower density peak. In order to determine the fate of the second peak, we have performed 3D radiation hydrodynamic simulations using the results of cosmological hydrodynamic simulations by Suwa et al. We have found that although a large part of the second peak is stripped by a shock accompanied by the ionization front, its core can survive by self-shielding. The core can eventually collapse ~ 50 Myr after the death of the nearby star. We discuss the impact of partial photoevaporation on the masses of secondary Pop III stars.
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