Observations of the high-redshift Universe with the 21cm hyperfine line of neutral hydrogen
promise to open an entirely new window onto the early phases of cosmic structure formation …

Despite much recent theoretical and observational progress in our knowledge of the early
universe, many fundamental questions remain only partially answered. Here, we review the …

We study the evolution of the ionization state of the intergalactic medium (IGM) at the end of
the reionization epoch using moderate-resolution spectra of a sample of 19 quasars at 5.74< …

We present the results of our ultra-deep Keck/DEIMOS spectroscopy of z-dropout galaxies in
the Subaru Deep Field and Great Observatories Origins Deep Survey's northern field. For 3 …

We report an extensive search for Lyα emitters (LAEs) at z= 6.5 in the Subaru Deep Field.
Subsequent spectroscopy with Subaru and Keck identified eight more LAEs, giving a total of …

We present the first large-scale radiative transfer simulations of cosmic reionization, in a
simulation volume of (100 h− 1 Mpc) 3. This is more than a two orders of magnitude …

Observations have set the first constraints on the epoch of reionization (EoR), corresponding
to the formation epoch of the first luminous objects. Studies of Gunn-Peterson (GP) …

The gamma-ray burst (GRB) 050904 at provides the first opportunity to probe the
intergalactic medium (IGM) by GRBs at the epoch of reionization. Here, we present a …

The discovery of luminous quasars at redshift z~ 6 indicates the presence of supermassive
black holes (SMBHs) of mass~ 10 9 M☉ when the universe was less than 1 billion years old …

We present the properties of Ly emitters (LAEs) at in the Subaru Deep Field. A photometric
sample of 89 LAE candidates was constructed from narrow-band data down to (AB) in a …