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 …

The presence of excess scatter in the Ly-α forest at z∼ 5.5, together with the existence of
sporadic extended opaque Gunn-Peterson troughs, has started to provide robust evidence …

We present measurements of black hole masses and Eddington ratios (λ Edd) for a sample
of 38 bright (M 1450<− 24.4 mag) quasars at 5.8≲ z≲ 7.5, derived from Very Large …

Characterizing the prevalence and properties of faint active galactic nuclei (AGNs) in the
early Universe is key for understanding the formation of supermassive black holes (SMBHs) …

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 …

Luminous z≥ 7 quasars provide direct probes of the evolution of supermassive black holes
(SMBHs) and the intergalactic medium (IGM) during the epoch of reionization (EoR). The …

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 …

The observation of quasars at very high redshift such as Pōniuā'ena is a challenge for
models of supermassive black hole (SMBH) formation. This work presents a study of SMBH …

We present X-SHOOTER near-IR spectroscopy of a large sample of 38 luminous (M 1450=−
29.0 to− 24.4) quasars at 5.78< z< 7.54, which have complementary [C ii] 158μm …

The identification of bright quasars at z≳ 6 enables detailed studies of supermassive black
holes, massive galaxies, structure formation, and the state of the intergalactic medium within …