The observable characteristics and subsequent evolution of young stellar populations is
dominated by their massive stars. As our understanding of those massive stars and the …

The launch of the James Webb Space Telescope (JWST) in late 2021 marks a new start for
studies of galaxy formation at high redshift (z≳ 6) during the era of cosmic reionization …

We present emission-line ratios from a sample of 27 Lyman-break galaxies from z∼ 5.5− 9.5
with− 17.0< M 1500<− 20.4, measured from ultra-deep JWST/NIRSpec multi-object …

The origins of Lyman continuum (LyC) photons responsible for the reionization of the
universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch …

Most of the hydrogen in the intergalactic medium (IGM) was rapidly ionized at high redshifts.
While observations have established that reionization occurred, observational constraints on …

The ultraviolet (UV) continuum slope (β, where f λ∝ λ β) of galaxies is sensitive to a variety
of properties, from the metallicity and age of the stellar population to dust attenuation …

We study the ionizing photon production efficiency at the end of the Epoch of Reionization
(z∼ 5.4− 6.6) for a sample of 30 Ly α emitters. This is a crucial quantity to infer the ionizing …

The protagonists of the last great phase transition of the universe—cosmic reionization—
remain elusive. Faint star-forming galaxies are leading candidates because they are found …

The ionizing photon escape fraction [Lyman continuum (LyC) f esc] of star-forming galaxies
is the single greatest unknown in the reionization budget. Stochastic sightline effects prohibit …

Reionization is thought to be driven by faint star-forming galaxies, but characterizing this
population has long remained very challenging. Here, we utilize deep nine-band JADES …