The impact of cosmic filaments on starburst galaxies across cosmic times
Baptiste Jego, Matthieu B\'ethermin, Katarina Kraljic, Clotilde Laigle, Lingyu Wang, Antonio La Marca, Olivier Ilbert, Hollis B. Akins, Caitlin M. Casey, Gavin Leroy, Ali Hadi, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Henry Joy McCracken, Louise Paquereau, Jason Rhodes

TL;DR
This study combines cosmological simulations and observational data to demonstrate that galaxy star formation activity correlates with proximity to cosmic web filaments, with this relationship evolving over cosmic time.
Contribution
It provides the first observational evidence of the evolution of galaxy-filament proximity dependence on star formation activity from z=2 to z=0.5.
Findings
Starburst galaxies are closer to filaments at z>1 and farther at z<1.
Main-sequence galaxies show little evolution in filament proximity.
Quenched galaxies are increasingly closer to filaments at lower redshifts.
Abstract
Cosmological simulations suggest that various galaxy properties depend on their location within the cosmic web. Yet direct observational evidence of the dependence of star formation activity on distance to filaments remains scarce and is missing at z>1. We investigate how starburst, main-sequence (MS), and quenched galaxies are distributed with respect to cosmic web filaments, and how this distribution evolves with redshift. We first use the SIMBA cosmological simulation to predict the redshift evolution of the mean distance to the closest filament from z=3 to z=0 for different galaxy populations after removing stellar-mass dependencies. We then measure the corresponding signal in the COSMOS field, using COSMOS2020 and COSMOS-Web data, where accurate photometric redshifts enable reconstruction of the projected cosmic web from z=2 to z=0.5, and starbursts are identified through…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
