\textsc{The Three Hundred} project: The \textsc{Gizmo-Simba} run

TL;DR

This paper introduces extsc{Gizmo-Simba}, a new galaxy cluster simulation suite within extsc{The Three Hundred} project, incorporating advanced galaxy formation physics and comparing its results to previous models, matching key observations at low redshift.

Contribution

The paper presents extsc{Gizmo-Simba}, a novel simulation suite with a state-of-the-art galaxy formation model, calibrated to match observed cluster properties and offering new insights into galaxy, gas, and black hole co-evolution.

Findings

extsc{Gizmo-Simba} matches observed stellar properties at z≈0.

Differences in stellar and gas mass evolution compared to previous models.

Black hole scaling relations are well reproduced at intermediate masses.

Abstract

We introduce \textsc{Gizmo-Simba}, a new suite of galaxy cluster simulations within \textsc{The Three Hundred} project. \textsc{The Three Hundred} consists of zoom re-simulations of 324 clusters with $M_{200}\gtrsim 10^{14.8}M_\odot$ drawn from the MultiDark-Planck $N$-body simulation, run using several hydrodynamic and semi-analytic codes. The \textsc{Gizmo-Simba} suite adds a state-of-the-art galaxy formation model based on the highly successful {\sc Simba} simulation, mildly re-calibrated to match $z=0$ cluster stellar properties. Comparing to \textsc{The Three Hundred} zooms run with \textsc{Gadget-X}, we find intrinsic differences in the evolution of the stellar and gas mass fractions, BCG ages, and galaxy colour-magnitude diagrams, with \textsc{Gizmo-Simba} generally providing a good match to available data at $z \approx 0$. \textsc{Gizmo-Simba}'s unique black hole growth and feedback model yields agreement with the observed BH scaling relations at the intermediate-mass range and predicts a slightly different slope at high masses where few observations currently lie. \textsc{Gizmo-Simba} provides a new and novel platform to elucidate the co-evolution of galaxies, gas, and black holes within the densest cosmic environments.