The MillenniumTNG Project: the hydrodynamical full physics simulation and a first look at its galaxy clusters

• DOI: 10.1093/mnras/stac3620
• Publication Date: 2023-07-20T01:54:24Z
• Authors: Rüdiger Pakmor; Volker Springel; Jonathan P Coles; Thomas Guillet; Christoph Pfrommer; Sownak Bose; Monica Barrera; Ana Maria Delgado; Fulvio Ferlito; Carlos Frenk; Boryana Hadzhiyska; César Hernández-A...; Lars Hernquist; Rahul Kannan; Simon D M White
• Keywords: Structure formation; Cosmic variance

Cosmological simulations are an important theoretical pillar for understanding nonlinear structure formation in our Universe and relating it to observations on large scales. In several papers, we introduce MillenniumTNG (MTNG) project that provides a comprehensive set of high-resolution, volume cosmic aiming better understand physical processes scales help interpreting upcoming large-scale galaxy surveys. We here focus the full physics box MTNG740 computes $(740\,\mathrm{Mpc})^3$ with baryonic mass resolution $3.1\times~10^7\,\mathrm{M_\odot}$ using \textsc{arepo} $80.6$~billion cells IllustrisTNG model. verify properties produced by consistent TNG simulations, including more recent observations. clusters analyse cluster scaling relations radial profiles. show both broadly various observational constraints. demonstrate SZ-signal deep lightcone is Planck limits. Finally, compare found SDSS-8 RedMaPPer richness catalogue space, finding very good agreement as well. However, {\it simultaneously} matching masses, richness, Compton-$y$ requires us assume SZ estimates underestimated $0.2$~dex average. Thanks its unprecedented high-resolution hydrodynamical calculation, simulation offers rich possibilities study baryons galaxies, clusters, scale structure, particular their impact cosmological