Hydrodynamical simulations of galaxy formation with non-Gaussian initial conditions
- Autor(en)
- Clément Stahl, Yohan Dubois, Benoit Famaey, Oliver Hahn, Rodrigo Ibata, Katarina Kraljic, Thomas Montandon
- Abstrakt
Collisionless simulations of structure formation with significant local primordial non-Gaussianities at Mpc scales have shown that a non-Gaussian tail favouring underdensities, with a negative f
NL parameter, can significantly change the merging history of galaxy-sized dark matter halos, which then typically assemble later than in vanilla ΛCDM. Moreover, such a small-scale negative f
NL could have interesting consequences for the cosmological S
8 tension. Here, we complement our previous work on collisionless simulations with new hydrodynamical simulations of galaxy formation in boxes of 30 Mpc/h, using the RAMSES code. In particular, we show that all feedback prescriptions being otherwise identical, simulations with a negative f
NL ∼ -1000 on small scales, hence forming galaxies a bit later than in vanilla ΛCDM, allow to form simulated galaxies with more disky kinematics than in the vanilla case. Therefore, such small-scale primordial non-Gaussianities could potentially help alleviate, simultaneously, tensions in cosmology and galaxy formation. These hydrodynamical simulations on small scales will need to be complemented with larger box simulations with scale-dependent non-Gaussianities, to statistically confirm these trends and explore their observational consequences in further detail.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Université de Strasbourg, Icm & Sorbonne University
- Journal
- Journal of Cosmology and Astroparticle Physics (JCAP)
- Band
- 2023
- Anzahl der Seiten
- 14
- ISSN
- 1475-7516
- DOI
- https://doi.org/10.1088/1475-7516/2023/09/036
- Publikationsdatum
- 09-2023
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik, 103044 Kosmologie, 103043 Computational Physics
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/93953ce4-8e45-4875-af8c-091f70cd85ac