Simba-C: the evolution of the thermal and chemical properties in the intragroup medium
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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 globalscaling
relations of nearby galaxy groups. We also study the evolution (z = 2 to 0) of the global properties for the 1 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.
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1Centre for Space Research, North-West University, Potchefstroom 2520, South Africa 2Department of Astronomy, School of Physics and Astronomy, and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong
University, Shanghai 200240, China 3School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3HJ, UK 4Departamento de F´ısica Teorica, ´ M-8, Universidad Autonoma ´ de Madrid, Cantoblanco 28049, Madrid, Spain 5Centro de Investigacion´ Avanzada en F´ısica Fundamental (CIAFF), Universidad Autonoma ´ de Madrid, Cantoblanco, 28049 Madrid, Spain 6National Institute for Theoretical and Computational Sciences (NITheCS), Potchefstroom 2520, South Africa 7Department of Physics & Astronomy, University of Victoria, Victoria BC V8P 5C2, Canada 8Department of Physics and Astronomy, University of the Western Cape, Bellville, 7535, South Africa 9Center for Computational Astrophysics, Flatiron Institute, 162 5th Ave, New York, NY 10010, USA 10Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield AL10 9AB, UK
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Hough, R.T., Shao, Z., Cui, W., Loubser, S.I., Babul, A., Davé, R., Rennehan, D. and Kobayashi, C., 2024. Simba-C: the evolution of the thermal and chemical properties in the intragroup medium. Monthly Notices of the Royal Astronomical Society, 532(1), pp.476-495.