Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399...32k&link_type=abstract
Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece
Other
Scientific paper
We have constructed a new theoretical model for the luminosity functions (LFs) of Lymanα emitters (LAEs) in the framework of hierarchical galaxy formation. We do not change the original model parameters, but instead introduce a physically motivated model to describe the escape fraction of Lymanα photons from host galaxies (fesclya). Specifically, for the first time two new effects are incorporated on fesclya: extinction by interstellar dust and galaxy-scale outflow induced as star formation feedback. The new model reproduces well all the observed Lymanα LFs of LAEs at z˜ 3-6. Our model predicts that galaxies with strong outflows and fesclya ≈ 0.4 should dominate the observed LFs. On the other hand, we find that our model significantly over-predicts LAEs at z> 6, and absorption of Lymanα photons by neutral hydrogen in the intergalactic medium (IGM) provides a reasonable interpretation for this discrepancy. This indicates that the IGM neutral fraction xhi rapidly evolves from xhi ≪ 1 at z< 6 to a value of order unity at z˜ 6-7, which is broadly consistent with other observational constraints on the history of reionization.
Kobayashi Masakazu A. R.
Totani Nagashima M. T.
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