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Paper: Mass-to-light Ratio of Ly α Emitters: Implications of Lyα Surveys at Redshifts z = 5.7, 6.5, 7, and 8.8
Volume: 393, New Horizons in Astronomy: Frank N. Bash Symposium 2007
Page: 199
Authors: Fernandez, E.; Komatsu, E.
Abstract: Using a simple method to interpret the luminosity function of Lyα emitters, we explore properties of Lyα emitters from 5.7 ≤ z ≤ 8.8 with various assumptions about metallicity and stellar mass spectra. We constrain a mass-to-“observed light” ratio, Mh/Lband. The mass-to-“bolometric light”, Mh/Lbol, can also be deduced, once the metallicity and stellar mass spectrum are given. Lyα emitters are consistent with either starburst galaxies (Mh/Lbol ∼ 0.1 − 1) with a smaller Lyα survival fraction, αescε1/γ ∼ 0.01 − 0.05, or normal populations (Mh/Lbol ∼ 10) if a good fraction of Lyα photons survived, αescε1/γ ∼ 0.5 − 1. We find no evidence for the end of reionization in the luminosity functions of Lyα emitters discovered in the current Lyα surveys. The data are consistent with no evolution of intrinsic properties of Lyα emitters or neutral fraction in the intergalactic medium up to z = 7. No detection of sources at z = 8.8 does not yield a significant constraint yet.
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