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FLAMINGO: Galaxy formation and feedback effects on the gas density and velocity fields by Ondaro-Mallea, Lurdes; Angulo, Raul E.; Aricò, Giovanni; Schaye, Joop; McCarthy, Ian G.; Schaller, Matthieu is a scholarly article available to read on EtoBox.

What is FLAMINGO: Galaxy formation and feedback effects on the gas density and velocity fields about?

Most of the visible matter in the Universe is in a gaseous state, subject to hydrodynamic forces and galaxy formation processes that are much more complex to model than gravity. These baryonic effects can potentially bias the analyses of several cosmological probes, such as weak gravitational lensing. In this work, we study the gas density and velocity fields of the FLAMINGO simulations and compare them with their gravity-only predictions. We find that, while the gas velocities do not differ from those of dark matter on large scales, the gas mass power spectrum is suppressed by up to $\approx 8\%$ relative to matter, even on gigaparsec scales. This is a consequence of star formation depleting gas in the densest and most clustered regions of the universe. On smaller scales, $k>0.1 \, h / \rm Mpc$, the power suppression for both gas densities and velocities is more significant and correlates with the strength of the active galactic nucleus (AGN) feedback. The impact of feedback can be understood in terms of outflows, identified as gas bubbles with positive radial velocities ejected from the central galaxy. With increasing feedback strength, the outflowing gas has higher velocities, a

Author

Ondaro-Mallea, Lurdes; Angulo, Raul E.; Aricò, Giovanni; Schaye, Joop; McCarthy, Ian G.; Schaller, Matthieu

Published

2024

Language

EN