Hydrodynamical simulations of galaxy formation with non-Gaussian initial conditions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue JCAP Année : 2023

Hydrodynamical simulations of galaxy formation with non-Gaussian initial conditions

Résumé

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 $f_{\rm NL}$ parameter, can significantly change the merging history of galaxy-sized dark matter halos, which then typically assemble later than in vanilla $\Lambda$CDM. Moreover, such a small-scale negative $f_{\rm NL}$ 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 {\sc RAMSES} code. In particular, we show that all feedback prescriptions being otherwise identical, simulations with a negative $f_{\rm NL} \sim -1000$ on small scales, hence forming galaxies a bit later than in vanilla $\Lambda$CDM, 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.

Dates et versions

hal-04170699 , version 1 (25-07-2023)

Identifiants

Citer

Clément Stahl, Yohan Dubois, Benoit Famaey, Oliver Hahn, Rodrigo Ibata, et al.. Hydrodynamical simulations of galaxy formation with non-Gaussian initial conditions. JCAP, 2023, 09, pp.036. ⟨10.1088/1475-7516/2023/09/036⟩. ⟨hal-04170699⟩
36 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More