천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제43권1호
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- Pages.57.1-57.1
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- 2018
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- 1226-2692(pISSN)
Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionization
- Kimm, Taysun (Yonsei university) ;
- Katz, Harley (University of Cambridge) ;
- Haehnelt, Martin (University of Cambridge) ;
- Rosdahl, Joakim (Universite Lyon) ;
- Devriendt, Julien (University of Oxford) ;
- Slyz, Adrianne (University of Oxford)
- 발행 : 2018.05.08
초록
Reionisation in the early Universe is likely driven by dwarf galaxies. Using cosmological RHD simulations, we study star formation and the escape of Lyman continuum (LyC) photons from mini-haloes with Mhalo<108Msun. We find that feedback reduces star formation very efficiently in mini-haloes, resulting in the stellar mass consistent with the empirical stellar mass-to-halo mass relation derived in the local Universe. Because star formation is stochastic and dominated by a few gas clumps, the escape fraction in mini-haloes is generally determined by photo-ionization, rather than supernova explosions. We find that the photon number-weighted mean escape fraction in mini-haloes is higher (20-40%) than that in atomic-cooling haloes. Despite their high escape fractions, LyC photons from mini-haloes are of minor importance for reionization due to inefficient star formation. We confirm previous claims that stars in atomic-cooling haloes with masses
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