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- W2114344218 abstract "We study the inhomogeneous reionization in a critical density CDM universe resulting from stellar sources, including Population III objects. The spatial distribution of the sources is obtained from high-resolution numerical N-body simulations. We calculate the source properties, taking into account a self-consistent treatment of both radiative (i.e. ionizing and H2-photodissociating photons) and stellar (i.e. SN explosions) feedbacks regulated by massive stars. This allows us to describe the topology of the ionized and dissociated regions at various cosmic epochs, and to derive the evolution of H, He and H2 filling factors, soft UV background, cosmic star formation rate and the final fate of ionizing objects. The main results are: (i) galaxies reionize the intergalactic medium by z≈10 (with some uncertainty related to the gas clumping factor), whereas H2 is completely dissociated already by z≈25; (ii) reionization is mostly caused by the relatively massive objects which collapse via H line cooling, while objects the formation of which relies on H2 cooling alone are insufficient for this purpose; (iii) the diffuse soft UV background is the major source of radiative feedback effects for z≤15; at higher z direct flux from neighbouring objects dominates; (iv) the match of the calculated cosmic star formation history with that observed at lower redshifts suggests that the conversion efficiency of baryons into stars is ≈1 per cent; (v) we find that a very large population of dark objects which failed to form stars is present by z≈8. We discuss and compare our results with similar previous studies." @default.
- W2114344218 created "2016-06-24" @default.
- W2114344218 creator A5005954136 @default.
- W2114344218 creator A5020702131 @default.
- W2114344218 creator A5055387284 @default.
- W2114344218 creator A5067805674 @default.
- W2114344218 date "2000-05-21" @default.
- W2114344218 modified "2023-10-12" @default.
- W2114344218 title "Inhomogeneous reionization of the intergalactic medium regulated by radiative and stellar feedbacks" @default.
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