12 (Tie with 11). Less Lyman-alpha emission from the oldest galaxies
- Title: Keck Spectroscopy of Faint 3 < z < 8 Lyman Break Galaxies: Evidence for a Declining Fraction of Emission Line Sources in the Redshift Range 6 < z < 8
- Authors: M. Schenker, D. Stark, R. Ellis, et al.
- First Author’s Institution: Department of Astrophysics, California Institute of Technology
Why it is important: The farther back in time we look, the closer we get to a point when the first stars and galaxies had only just turned on, and the universe was mostly filled with neutral gas. Here, we see a few hints that observations are approaching this regime.