Resolving the most luminous Lyman-alpha emitters in the epoch of reionisation

Wide-field surveys with ground-based telescopes have revealed a population of extremely luminous Lyman-alpha emitters observed at the end stages of reionisation (z>6). In the future, the Roman Space Telescope will increase the number of such objects by orders of magnitude. Currently, spatially resolved observations of these galaxies with existing telescopes already allow us to probe the emission from young stars, the interstellar medium and the properties of surrounding hydrogen gas. In this talk specifically, I will focus on spectroscopic follow-up studies of luminous galaxies at z>6 with ALMA, HST/WFC3, and MUSE and X-SHOOTER on the VLT. We find that these galaxies likely reside in early ionised bubbles and are complex systems, consisting of multiple components where traces of metals and outflows are already present. I will address the difficulty in addressing the nature of the ionising sources and discuss how these can be overcome with future JWST observations.