Résumé / Abstract Journal-club_Galaxies

Journal-club Galaxies

« Beyond halo mass: the role of vorticity-rich cosmic filaments in quenching galaxy mass assembly »

Clotilde Laigle
Institut d'Astrophysique de Paris (Paris, France)

We examine how the mass assembly of central galaxies is shaped by their location in the cosmic web, from an analysis of the HORIZON-AGN simulation. The dependency of galaxy properties on large-scale environments is mostly inherited from the (large-scale) environmental dependency of their host halo mass. However, when adopting a residual analysis that removes the host halo mass effect, we detect a direct and non-negligible influence of cosmic filaments. Proximity to filaments generally enhances the build-up of stellar mass, a result in agreement with previous studies. However, our multi-scale analysis also reveals that, at the edge of filaments, star formation is suppressed. In addition, we find clues for compaction of the stellar distribution at close proximity to filaments. We suggest that gas transfer from the outside to the inside of the haloes (where galaxies reside) becomes less efficient closer to filaments, due to the high angular momentum supply at the vorticity-rich edge of filaments. This quenching mechanism may partly explain the larger fraction of passive galaxies in filaments, as inferred from observations at lower redshifts.
jeudi 23 septembre 2021 - 11:30
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
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