Publications

The appearance of the first stars and galaxies ended the cosmic dark ages and began the reionisation of the Universe. Even after decades of study, we know very little about the protagonists of this phase-transition. This survey aims to build a benchmark sample of EoR analogues at z=3-4 with rest-UV and rest-optical spectroscopic data. The project will focus on the two biggest missing pieces in the quest of understanding EoR: production efficiency of ionising radiation and their escape fraction in the "First galaxies". Gupta+in prep.

A recent paper uses IllustrisTNG simulations to show that not all massive galaxies are the same, or evolve similarly. Massive galaxies with extended stellar distribution continue to form stars for another billion years, while normal-size massive shuts down immediately after cosmic noon. See Gupta+2020b for more details.

Using kinematics and cosmological simulations, we find that massive galaxies transition from the in-situ star formation to mass assembly via mergers at z<3. See Gupta+2020a for more details.

Using both the Keck Telescope in Hawaii and the Very Large Telescope in Chile, our targets include a range of emission line galaxies at z=3-4. Strong [OIII]5007 emitters at z~3 are almost 1 dex above the main sequence, and have a 60% gas fraction.

See Tran+2020 for more details.

Star formation history of the extreme emission galaxies (EOR analogs) reconstructed using prospector show that they are undergoing first phase in their stellar assembly. For more details see Cohn+2018.