The existence of∼ 109M⊙ supermassive black holes (SMBHs) within the first billion years
of the Universe has stimulated numerous ideas for the prompt formation and rapid growth of …

The evolution of the content of heavy elements in galaxies, the relative chemical
abundances, their spatial distribution, and how these scale with various galactic properties …

We report on the discovery of two low-luminosity, broad-line active galactic nuclei (AGNs) at
z> 5 identified using JWST NIRSpec spectroscopy from the Cosmic Evolution Early Release …

Several theories have been proposed to describe the formation of black hole seeds in the
early Universe and to explain the emergence of very massive black holes observed in the …

We present rest-frame optical data of the compact z= 5.55 galaxy GS_3073 obtained using
the integral field spectroscopy mode of the Near-InfraRed Spectrograph on board the James …

Distant quasars are unique tracers to study the formation of the earliest supermassive black
holes (SMBHs) and the history of cosmic reionization. Despite extensive efforts, only two …

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 report the discovery of a luminous quasar, J1007+ 2115 at z= 7.515 (" Pōniuā'ena"), from
our wide-field reionization-era quasar survey. J1007+ 2115 is the second quasar now …

The final phase of the reionization process can be probed by rest-frame UV absorption
spectra of quasars at z≳ 6, shedding light on the properties of the diffuse intergalactic …

We report the results of near-infrared spectroscopic observations of 37 quasars in the
redshift range 6.3< z≤ 7.64, including 32 quasars at z> 6.5, forming the largest quasar near …