- The values of the cosmic age and distance in this press release are
based on the latest Planck results. Planck observes the cosmic microwave
background. A previous press release on this subject used values based
on the cosmological parameters derived from the measurements by WMAP
(Wilkinson Microwave Anisotropy Probe).
The parameters used here are H_0=67.1 km/s/Mpc, Ω=0.317, Λ=0.683 instead of the ones used in the past articles at Subaru Telescope's website H_0=71, Ω=0.27, Λ=0.73.
- Lyman-alpha emission line is a spectral line of hydrogen, with a wavelength of 121.6 nm (1nm is one billionth of a meter), and is in the ultraviolet portion of the spectrum. Galaxies illuminated by strong Lyman-alpha line are called "Lyman-alpha emitting galaxies" (LAEs).
- In previous studies, astronomers have found hundreds of LAEs existing 12.9 billion years ago, which corresponds to the epoch when cosmic reionization finally ended.