H2 MAGIE: H2 as a Major Agent to Galaxy Interaction and Evolution

TL;DR

This paper introduces a new class of H2-luminous galaxies with suppressed star formation, exploring their role in galaxy evolution and the mechanisms powering their H2 emission during active phases.

Contribution

It presents observational and theoretical insights into H2 galaxies, highlighting their significance in galaxy interaction and evolution processes, especially during violent phases.

Findings

Discovery of H2-luminous galaxies with suppressed star formation

H2 emission powered by galaxy interactions, AGN feedback, and gas accretion

Implications for understanding galaxy formation and evolution

Abstract

Spitzer space telescope spectroscopy reveal a new class of H2-luminous galaxies with enhanced H2 line emission, but where star formation is strongly suppressed. This is in sharp contrast with what is observed in standard star forming galaxies. These sources are all in active phases of galaxy evolution (galaxy interactions, AGN feedback, gas accretion in galaxy clusters, etc.). Why is H2 present in violent phases of galaxy evolution? How is the H2 emission powered? Why is the H2 gas inefficient at forming stars? What can we learn from these "H2 galaxies" about galaxy formation? This thesis addresses these questions, and discuss the theoretical and observational perspectives of this work (in particular Herschel and JWST).