M. Maseda

Are High-EW LAEs good analogs for the earliest galaxies? A study on the ionizing conditions and gas properties of LAEs at $2\lesssim z\lesssim7

Lyman-$\alpha$ emitters (LAEs) are frequently proposed as analogs of the low-mass, metal-poor galaxies thought to dominate cosmic reionization. In particular, galaxies with large Ly$\alpha$ equivalent widths (EWs) are expected to have not experienced significant chemical enrichment. We test this hypothesis using a samp...

IRAC-Excess Galaxies in the NIRSpec Wide Survey: physical properties of bright EELGs at $z\sim7$ and implications for Reionization

We present an analysis of 23 Spitzer/IRAC excess galaxies at $5.66<z<7.64$, observed as part of the NIRSpec Wide GTO survey. With NIRSpec PRISM spectroscopy, we measure a median rest-frame [OIII]$+\rm{H}\beta$ EW $=1583$~{\AA}, consistent with predictions from the pre-JWST selection and we identify $17/23$ $(\sim74\%)$...

JADES data release 4 – Paper I . Sample selection, observing strategy and redshifts of the complete spectroscopic sample

Spatially Resolved Active Galactic Nucleus Ionization and Star Formation at Cosmic Noon with JWST/JEMS

At cosmic noon (z ≈ 2–3), both star formation and active galactic nucleus (AGN) activity peaked, each playing a significant role in ionizing interstellar gas on galaxy-wide scales. The spatial distribution of this ionized gas provides a direct probe of how AGN and stellar ionization influence the gaseous reservoirs of...