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Title: The properties of galaxies deep into the Epoch of Reionization: insights from ALMA & JWST
Speaker: Andrea Pallottini
Affiliation: Scuola Normale Superiore
Time: Thursday 23 November 2023, 1400 to 1500
Location: 11137Å
Abstract: The characterization of primeval galaxies is a key question of modern astrophysics. With the advent of JWST and the ongoing work of ALMA, for the first time we can fully probe the spectrum of the first galaxies from the UV/optical to the Far Infrared, giving us a comprehensive view of the various phases constituting the Interstellar Medium (ISM) of galaxies in the Epoch of Reionization (EoR). To exhaustively interpret such exquisite observations, it is necessary to compare with likewise refined models. In this talk, I will present results from a suite of cosmological zoom-in simulations of galaxies in the EoR that are able to accurately follow their radiative, hydrodynamical, and chemical evolution, resolving the ISM down to molecular cloud scale. Combining such simulations with state-of-the-art line and continuum emission models allows us to fairly compare with the exciting results from ALMA & JWST, e.g. to study the presence of quenched galaxies already at z~7.3 and assess the possibility of disk formation already at very early epochs. I will conclude by pinpointing the possible limitations of current simulations, i.e. showing which physical ingredients are now missing and can explain the over-abundance of z>10 galaxies inferred from the luminosity functions from JWST: such analysis is critical in order to improve our models and thus further our physical understanding.