We present the survey design, implementation, and outlook for COSMOS-Web, a 255 hr
treasury program conducted by the James Webb Space Telescope in its first cycle of …

Quasars at cosmic dawn provide powerful probes of the formation and growth of the earliest
supermassive black holes (SMBHs) in the Universe, their connections to galaxy and …

EIGER. I. A Large Sample of [O iii]-emitting Galaxies at 5.3 < z < 6.9 and Direct Evidence for
Local Reionization by Galaxies - IOPscience Skip to content IOP Science home Accessibility …

Recent quasar absorption line observations suggest that reionization may end as late as. As
a means to search for large neutral hydrogen islands at, we revisit long dark gaps in the Ly …

The mean free path of ionizing photons, λmfp, is a key factor in the photoionization of the
intergalactic medium (IGM). At z≳ 5, however, λmfp may be short enough that …

High-redshift quasi-stellar object (QSO) spectra show large spatial fluctuations in the Ly α
opacity of the intergalactic medium on surprisingly large scales at≳ 5.5. We present a …

Detections and non-detections of Lyman alpha (Lyα) emission from z> 6 galaxies (< 1 Gyr
after the big bang) can be used to measure the timeline of cosmic reionization. Of key …

The mean free path of ionizing photons, λ mfp, is a critical parameter for modeling the
intergalactic medium (IGM) both during and after reionization. We present direct …

Determinations of the ultraviolet (UV) luminosity function of active galactic nuclei (AGN) at
high redshifts are important for constraining the AGN contribution to reionization and …

We report new measurements of the intergalactic medium (IGM) Lyα and Lyβ effective
optical depth at 5.3< z< 6.5, using a new sample of quasar sight lines including 32 quasars …