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Galaxy merger histories and the role of merging in driving star formation at z>1
S. Kaviraj, J. Devriendt, Y. Dubois +5
We use Horizon-AGN, a hydrodynamical cosmological simulation, to explore the role of mergers in the evolution of massive (M > 10^10 MSun) galaxies around the epoch of peak cosmic s…
How do galaxies build up their spin in the cosmic web?
charlotte Welker, Yohan Dubois, Julien Devriendt +2
Using the Horizon-AGN simulation we find a mass dependent spin orientation trend for galaxies: the spin of low-mass, rotation-dominated, blue, star-forming galaxies are preferentia…
How the cosmic web induces intrinsic alignments of galaxies
Sandrine Codis, Yohan Dubois, Christophe Pichon +2
Intrinsic alignments are believed to be a major source of systematics for future generation of weak gravitational lensing surveys like Euclid or LSST. Direct measurements of the al…
Why do galactic spins flip in the cosmic web? A Theory of Tidal Torques near saddles
Christophe Pichon, Sandrine Codis, Dmitry Pogosyan +3
Filaments of the cosmic web drive spin acquisition of disc galaxies. The point process of filament-type saddle represent best this environment and can be used to revisit the Tidal…
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
Sandrine Codis, Raphael Gavazzi, Yohan Dubois +6
The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 16…
Mergers drive spin swings along the cosmic web
Charlotte Welker, Julien Devriendt, Yohan Dubois +2
The close relationship between mergers and the reorientation of the spin for galaxies and their host dark haloes is investigated using a cosmological hydrodynamical simulation (Hor…