The bulk of cosmic matter resides in a dilute reservoir that fills the space between galaxies,
the intergalactic medium (IGM). The history of this reservoir is intimately tied to the cosmic …

Measurement of the spatial distribution of neutral hydrogen via the redshifted 21-cm line
promises to revolutionize our knowledge of the epoch of reionization and the first galaxies …

We introduce the thesan project, a suite of large volume () radiation-magnetohydrodynamic
simulations that simultaneously model the large-scale statistical properties of the …

We report the discovery of an extremely long (∼ 110 Mpc h− 1) and dark (τeff≳ 7) Lyα
trough extending down to z≃ 5.5 towards the z em≃ 6.0 quasar ULAS J0148+ 0600. We use …

Understanding cosmic reionization requires the identification and characterization of early
sources of hydrogen-ionizing photons. The 2012 Hubble Ultra Deep Field (UDF12) …

We introduce a powerful seminumeric modelling tool, 21cmfast, designed to efficiently
simulate the cosmological 21-cm signal. Our code generates 3D realizations of evolved …

Protogalaxies forming in low-mass dark matter haloes are thought to provide the majority of
ionizing photons needed to reionize the Universe, due to their high escape fractions of …

Star-forming galaxies trace cosmic history. Recent observational progress with the NASA
Hubble Space Telescope has led to the discovery and study of the earliest known galaxies …

We compare a sample of five high-resolution, high S/N Ly α forest spectra of bright 6< z<∼
6.5 QSOs aimed at spectrally resolving the last remaining transmission spikes at z> 5 with …

We present new results from our search for z∼ 7 galaxies from deep spectroscopic
observations of candidate z dropouts in the CANDELS fields. Despite the extremely low flux …