Simba-C: the evolution of the thermal and chemical properties in the intragroup medium

Renier T Hough, Zhiwei Shao, Weiguang Cui, S Ilani Loubser, Arif Babul, Romeel Davé, Douglas Rennehan, Chiaki Kobayashi

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Abstract

The newly updated GIZMO and Simba based simulation, 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. Simba-C shows improved consistent matching with the observations of all X-ray scaling relations compared to Simba. It is well known that AGN feedback has a significant influence on LX, 0.5–2.0–Tspec, corr, S500/2500–Tspec, corr, and gas mass fractions, with our 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 Simba-C produces an increase in the amount of heavier elements (specifically Si and Fe) relative to O, compared to Simba.
Original languageEnglish
Article numberstae1435
Pages (from-to)476-495
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume532
Issue number1
Early online date13 Jun 2024
DOIs
Publication statusE-pub ahead of print - 13 Jun 2024

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