Mass-to-light Ratio of Lyα Emitters: Implications of Lyα Surveys at Redshifts z=5.7, 6.5, 7, and 8.8

Details Mass-to-light Ratio of Lyα Emitters: Implications of Lyα Surveys at Redshifts z=5.7, 6.5, 7, and 8.8 Mass-to-light Ratio of Lyα Emitters: Implications of Lyα Surveys at Redshifts z=5.7, 6.5, 7, and 8.8

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..393..199f&link_type=abstract

New Horizons in Astronomy: Frank N. Bash Symposium 2007 ASP Conference Series, Vol. 393, proceedings of the conference held 14-1

Astronomy and Astrophysics

Astronomy

Scientific paper

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, αescɛ1/γ˜ 0.01-0.05, or normal populations (Mh/Lbol˜ 10) if a good fraction of Lyα photons survived, αescɛ1/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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