Efficient Reionization in a Large Hydrodynamic Galaxy Formation Simulation Article Swipe

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J. Davies , Simeon Bird , Simon J. Mutch , Yueying Ni , Yu Feng , Rupert A. C. Croft , Tiziana Di Matteo , J. Stuart B. Wyithe · YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2306.07861

Accuracy in the topology and statistics of a simulated Epoch of Reionization (EoR) are vital to draw connections between observations and physical processes. While full radiative transfer models produce the most accurate reionization models, they are highly computationally expensive, and are infeasible for the largest cosmological simulations. Instead, large simulations often include EoR models that are pre-computed via the initial density field, or post-processed where feedback effects are ignored. We introduce Astrid-ES, a resimulation of the Astrid epoch of reionisation $20 > z > 5.5$ which includes an on-the-fly excursion-set reionization algorithm. Astrid-ES produces more accurate reionization histories without significantly impacting the computational time. This model directly utilises the star particles produced in the simulation to calculate the EoR history and includes a UV background which heats the gas particles after their reionization. We contrast the reionization topology and statistics in Astrid-ES with the previously employed parametric reionisation model, finding that in Astrid-ES, ionised regions are more correlated with galaxies, and the 21cm power-spectrum shows an increase in large scale power. We calculate the relation between the size of HII regions and the UV luminosity of the brightest galaxy within them. Prior to the overlap phase, we find a power-law fit of $\mathrm{log} (R) = -0.314 M_\mathrm{UV} - 2.550 \mathrm{log}(1+z) + 7.408$ with a standard deviation $σ_R < 0.15 \mathrm{dex}$ across all mass bins. We also examine the properties of halos throughout reionization, finding that while the properties of halos in the simulation are correlated with the redshift of reionisation, they are not greatly affected by reionisation itself.

Type

preprint

Language

en

Landing Page

http://arxiv.org/abs/2306.07861

PDF

https://arxiv.org/pdf/2306.07861

OA Status

green

Cited By

1

Related Works

10

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https://openalex.org/W4380715433

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OpenAlex ID

https://openalex.org/W4380715433

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DOI

https://doi.org/10.48550/arxiv.2306.07861

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Title

Efficient Reionization in a Large Hydrodynamic Galaxy Formation Simulation

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Type

preprint

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Language

en

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Publication year

2023

Year of publication

Publication date

2023-06-13

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Authors

J. Davies, Simeon Bird, Simon J. Mutch, Yueying Ni, Yu Feng, Rupert A. C. Croft, Tiziana Di Matteo, J. Stuart B. Wyithe

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Landing page

https://arxiv.org/abs/2306.07861

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PDF URL

https://arxiv.org/pdf/2306.07861

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Open access

Yes

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OA status

green

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https://arxiv.org/pdf/2306.07861

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Concepts

Reionization, Physics, Astrophysics, Galaxy, Star formation, Spectral density, Halo, Radiative transfer, Cosmology, Luminosity, Statistics, Redshift, Quantum mechanics, Mathematics

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Cited by

1

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2023: 1

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Related works (count)

10

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