In the past five years, deep imaging campaigns conducted with the Hubble Space
Telescope (HST) and ground-based observatories have delivered large samples of galaxies …

One of the main goals of the JWST is to study the first galaxies in the Universe. We present a
systematic photometric analysis of very distant galaxies in the first JWST deep field towards …

ABSTRACT Spitzer/Infrared Array Camera (IRAC) imaging has revealed that the brightest
z∼ 7− 8 galaxies often exhibit young ages and strong nebular line emission, hinting at high …

Recent JWST/NIRCam imaging taken for the ultra-deep UNCOVER program reveals a very
red dropout object at z phot≃ 7.6, triply imaged by the galaxy cluster A2744 (zd= 0.308). All …

We present the spectroscopic confirmation of a protocluster at z= 7.88 behind the galaxy
cluster Abell 2744 (hereafter A2744-z7p9OD). Using JWST NIRSpec, we find seven …

The epoch of reionization probes the state of our universe when the very first stars formed
and ionized the hydrogen atoms in the surrounding medium. Since the epoch has not yet …

Reionization is thought to be driven by faint star-forming galaxies, but characterizing this
population has long remained very challenging. Here, we utilize deep nine-band JADES …

The escape fraction of Lyman-continuum (LyC) photons (f esc) is a key parameter for
determining the sources of cosmic reionization at z≥ 6. At these redshifts, owing to the …

We present new determinations of the rest-UV luminosity functions (LFs) at z= 2–9 to
extremely low luminosities (>− 14 mag) from a sample of> 2500 lensed galaxies found …

We present a new parametric lens model for the massive galaxy cluster Abell 2744 based
on new ultra-deep JWST imaging taken in the framework of the UNCOVER program. These …