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A stochastic model to reproduce the star formation history of individual galaxies in hydrodynamic simulations

Wang, Yang; Napolitano, Nicola R.; Cui, Weiguang; Li, Xiao Dong; Knebe, Alexander; Power, Chris; Pearce, Frazer; Tang, Lin; Yepes, Gustavo; Kang, Xi

A stochastic model to reproduce the star formation history of individual galaxies in hydrodynamic simulations Thumbnail


Authors

Yang Wang

Nicola R. Napolitano

Weiguang Cui

Xiao Dong Li

Alexander Knebe

Chris Power

Lin Tang

Gustavo Yepes

Xi Kang



Abstract

The star formation history (SFH) of galaxies is critical for understanding galaxy evolution. Hydrodynamical simulations enable us to precisely reconstruct the SFH of galaxies and establish a link to the underlying physical processes. In this work, we present a model to describe individual galaxies' SFHs from three simulations: TheThreeHundred, Illustris-1, and TNG100-1. This model divides the galaxy SFH into two distinct components: the 'main sequence' and the 'variation'. The 'main sequence' part is generated by tracing the history of the SFR - M∗ main sequence of galaxies across time. The 'variation' part consists of the scatter around the main sequence, which is reproduced by fractional Brownian motions. We find that: (1) the evolution of the main sequence varies between simulations; (2) fractional Brownian motions can reproduce many features of SFHs; however, discrepancies still exist; and (3) the variations and mass-loss rate are crucial for reconstructing the SFHs of the simulations. This model provides a fair description of the SFHs in simulations. On the other hand, by correlating the fractional Brownian motion model to simulation data, we provide a 'standard' against which to compare simulations.

Journal Article Type Article
Acceptance Date Jul 7, 2022
Online Publication Date Jul 13, 2022
Publication Date Sep 1, 2022
Deposit Date Dec 20, 2022
Publicly Available Date Dec 21, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Peer Reviewed Peer Reviewed
Volume 515
Issue 3
Pages 3249-3269
DOI https://doi.org/10.1093/mnras/stac1956
Keywords Space and Planetary Science, Astronomy and Astrophysics
Public URL https://nottingham-repository.worktribe.com/output/10357767
Publisher URL https://academic.oup.com/mnras/article/515/3/3249/6643333

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