\texttt{Simba}-\texttt{C}: the evolution of the thermal and chemical properties in the intragroup medium

TL;DR

Simba-C, an updated simulation with refined feedback and chemical models, provides a detailed understanding of the evolution and properties of the intragroup medium, aligning well with observations and improving previous models.

Contribution

This paper introduces Simba-C, a new simulation that improves modeling of stellar feedback, chemical enrichment, and AGN feedback, enhancing agreement with observed X-ray properties of galaxy groups.

Findings

Simba-C matches observed X-ray scaling relations more accurately than Simba.

Recalibrated AGN feedback improves gas entropy and aligns with CLoGS observations.

Chemical enrichment models show increased heavy element abundance ratios, especially Si and Fe relative to O.

Abstract

The newly updated \texttt{GIZMO} and \texttt{Simba} based simulation, \texttt{Simba-C}, with its new stellar feedback, chemical enrichment, and recalibrated AGN feedback, allows for a detailed study of the intragroup medium X-ray properties. We discuss the impact of various physical mechanisms, e.g. stellar and AGN feedback, and chemical enrichment, on the composition and the global scaling relations of nearby galaxy groups. We also study the evolution ($z=2$ to $0$) of the global properties for the $1\,\mathrm{keV}$ temperature groups. \texttt{Simba-C} shows improved consistent matching with the observations of all X-ray scaling relations compared to \texttt{Simba}. It is well known that AGN feedback has a significant influence on $L_{X,0.5-2.0}-T_{spec,corr}$, $S_{500/2500}-T_{spec,corr}$, and gas mass fractions, with our \texttt{Simba-C} results consistent with it. Our recalibrated AGN feedback strength also showed an additional improvement in gas entropy, which now aligns with CLoGS observations. The updated stellar feedback and chemical enrichment model is shown to play an important role in our understanding of the chemical abundance ratios and their evolution within galaxy groups. In particular, we find that \texttt{Simba-C} produces an increase in the amount of heavier elements (specifically Si and Fe) relative to O, compared to \texttt{Simba}.