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Nordita Astrophysics seminars

Modeling the interstellar medium of high redshift galaxies

by Dr Livia Vallini (Nordita)

In the last few years, the advent of ALMA, made it possible the detection of far-infrared (FIR) metal and molecular cooling lines from z>6 galaxies. These lines, represent a powerful tool to shed light on the physical properties of the cold interstellar medium in the first galaxies. In this talk I will provide an overview regarding the semi-analytical models that I developed to describe the relative abundance of various gas phases in the ISM of the first galaxies. The models include a full treatment of the effects of stellar far-ultraviolet photons on the structure, chemistry, and thermal balance of the ISM. Once coupled to high-resolution cosmological simulations, they allowed to successfully interpret various ALMA detections from galaxies at z>6, putting constraints on their metallicity, and on the feedback of star formation on molecular gas.