Spurred by rich, multiwavelength observations and enabled by new simulations, ranging
from cosmological to subparsec scales, the past decade has seen major theoretical …

We review the properties and nature of luminous high-redshift radio galaxies (HzRGs, z> 2)
and the environments in which they are located. HzRGs have several distinct constituents …

We present an updated model of the cosmic ionizing background from the UV to the X-rays.
Relative to our previous model, the new model provides a better match to a large number of …

We present new ALMA observations and physical properties of a Lyman break galaxy at z=
7.15. Our target, B14-65666, has a bright ultra-violet (UV) absolute magnitude, M UV≈ …

Direct Lyα imaging of intergalactic gas at $ z\sim 2$ has recently revealed giant
cosmological structures around quasars, eg, the Slug Nebula. Despite their high luminosity …

We present new results on the kinematics and spatial distribution of metal-enriched gas
within∼ 125 kpc of star-forming (" Lyman break") galaxies at redshifts 2≲ z≲ 3. In particular …

The Ly α line is a powerful probe of distant galaxies, which contains information about
inflowing/outflowing gas through which Ly α photons scatter. To develop our understanding …

The visibility of high-redshift Lyman-alpha emitting galaxies (LAEs) provides important
constraints on galaxy formation processes and the Epoch of Reionization (EoR). However …

We develop a new method to determine the distance between a high-redshift galaxy and a
foreground screen of atomic hydrogen. In a partially neutral universe, and assuming …

The ionizing background determines the ionization balance and the thermodynamics of the
cosmic gas. It is therefore a fundamental ingredient to theoretical and empirical studies of …