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Astrophysics > Astrophysics of Galaxies

arXiv:2406.13254 (astro-ph)
[Submitted on 19 Jun 2024]

Title:The multi-component fitting to the star formation histories in the TNG simulation

Authors:Yang Wang, Chengxing Dong, Hengxin Ruan, Qiufan Lin, Yucheng Zhang, Shupei Chen
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Abstract:The star formation history (SFH) is a key issue in the evolution of galaxies. In this work, we developed a model based on a Gaussian and gamma function mixture to fit SFHs with varying numbers of components. Our primary objective was to use this model to reveal the shape of SFHs and the corresponding physical driving factors. Specifically, we applied this model to fit SFHs from the TNG100-1 simulation. Our study led to the following findings: 1) Our model fits with TNG star formation histories well, especially for high-mass and red galaxies; 2) A clear relationship exists between the number and shape of fitted components and the mass and color of galaxies, with notable differences observed between central/isolated and satellite galaxies. 3) Our model allowed us to extract different episodes of star formation within star formation histories with ease and analyze the duration and timing of each star formation episode. Our findings indicated a strong relationship between the timing of each star formation episode and galaxy mass and color.
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2406.13254 [astro-ph.GA]
  (or arXiv:2406.13254v1 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.2406.13254
Journal reference: ApJ 968 115 (2024)
Related DOI: https://doi.org/10.3847/1538-4357/ad402f

Submission history

From: Yang Wang [view email]
[v1] Wed, 19 Jun 2024 06:37:47 UTC (2,153 KB)
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