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Star formation in Illustris TNG galaxy mergers

Published online by Cambridge University Press:  02 January 2026

András Péter Joó ,
Bendegúz Koncz ,
Andreas Burkert ,
István Horváth  and
L. Viktor Tóth
András Péter Joó*
Affiliation:
Institute of Physics and Astronomy, Eötvös Loránd University, Budapest, Hungary
Bendegúz Koncz
Affiliation:
Institute of Physics and Astronomy, Eötvös Loránd University, Budapest, Hungary Faculty of Science and Technology, University of Debrecen, Hungary
Andreas Burkert
Affiliation:
Universitäs-Sternwarte, Ludwig-Maximilians-Universität München, Germany
István Horváth
Affiliation:
University of Public Service, Budapest, Hungary
L. Viktor Tóth
Affiliation:
Institute of Physics and Astronomy, Eötvös Loránd University, Budapest, Hungary Faculty of Science and Technology, University of Debrecen, Hungary
*
email: andraspeterjooastro@gmail.com
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Abstract

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Cosmological magneto-hydrodynamical simulations such as IllustrisTNG describe the first chapters of our cosmic history. In our study, we focus on the evolution of the physical and chemical properties of galaxies in a series of mergers. We processed the catalogue data and the merger tree files of the TNG100-1 and the TNG300-1 simulations and investigated the evolution of progenitor galaxies, their merger companions (next progenitor) and their common descendants. We calculated the galaxies’ average star formation rate (SFR), metallicity and mass at different redshifts between 0 < z < 15 and found that the SFR of the descendant galaxies is increasing through the mergers. We traced both the large-scale structure and mass build-up in events involving dwarf galaxies. We reconstructed the observed cosmic star formation rate density variation through a large time interval (12 > z > 0) and confronted the model predictions with recent JWST observations. We discuss how the dwarf galaxies influenced the mass increase of galaxies from both observational and computational approaches. Our results show that a high fraction of galaxy mergers is connected to superclusters, especially at lower redshifts.

Keywords

star formation rate densitycosmic star formation historygalaxy evolutionJWST

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S391: The First Chapters of Our Cosmic History with JWST , December 2023 , pp. 127 - 132
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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