Science

Epoch of reionisation is a key phase transition in our Universe's history, where it went from neutral to full ionized. The MOSEL survey will build a benchmark sample of EoR analogues (super star-forming dwarf galaxies) at z=3-4 to estimate the production efficiency of ionizing radiation and their escape fraction in the "First galaxies".

Our current cosmological paradigm says that galaxies initially build up their stellar disk through in-situ star formation but at some point mergers take over and most of the stellar mass after that is accreted from other galaxies. Our observations show that this transition for massive galaxies happens between z=2-3. Please see Gupta+2020a for more details.