Schaye, J, Kugel, R, Schaller, M, Helly, JC, Braspenning, J, Elbers, W, McCarthy, IG, Van Daalen, MP, Vandenbroucke, B, Frenk, CS, Kwan, J, Salcido, J, Bahé, YM, Borrow, J, Chaikin, E, Hahn, O, Huško, F, Jenkins, A, Lacey, CG and Nobels, FSJ (2023) The FLAMINGO project: Cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys. Monthly Notices of the Royal Astronomical Society, 526 (4). pp. 4978-5020. ISSN 0035-8711

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Abstract

We introduce the Virgo Consortium's FLAMINGO suite of hydrodynamical simulations for cosmology and galaxy cluster physics. To ensure the simulations are sufficiently realistic for studies of large-scale structure, the subgrid prescriptions for stellar and AGN feedback are calibrated to the observed low-redshift galaxy stellar mass function and cluster gas fractions. The calibration is performed using machine learning, separately for each of FLAMINGO's three resolutions. This approach enables specification of the model by the observables to which they are calibrated. The calibration accounts for a number of potential observational biases and for random errors in the observed stellar masses. The two most demanding simulations have box sizes of 1.0 and 2.8 Gpc on a side and baryonic particle masses of 1 × 108 and, respectively. For the latter resolution, the suite includes 12 model variations in a 1 Gpc box. There are 8 variations at fixed cosmology, including shifts in the stellar mass function and/or the cluster gas fractions to which we calibrate, and two alternative implementations of AGN feedback (thermal or jets). The remaining 4 variations use the unmodified calibration data but different cosmologies, including different neutrino masses. The 2.8 Gpc simulation follows 3 × 1011 particles, making it the largest ever hydrodynamical simulation run to z = 0. Light-cone output is produced on-The-fly for up to 8 different observers. We investigate numerical convergence, show that the simulations reproduce the calibration data, and compare with a number of galaxy, cluster, and large-scale structure observations, finding very good agreement with the data for converged predictions. Finally, by comparing hydrodynamical and 'dark-matter-only' simulations, we confirm that baryonic effects can suppress the halo mass function and the matter power spectrum by up to ≈20 per cent.

Item Type:	Article
Uncontrolled Keywords:	methods: numerical; galaxies: clusters: general; galaxies: formation; cosmology: theory; large-scale structure of Universe; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press (OUP)
SWORD Depositor:	A Symplectic
Date Deposited:	08 Oct 2024 15:45
Last Modified:	08 Oct 2024 16:00
DOI or ID number:	10.1093/mnras/stad2419
URI:	https://researchonline.ljmu.ac.uk/id/eprint/24457

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