Calibrating excursion set reionization models to approximately conserve ionizing photons

Author:

Park Jaehong1ORCID,Greig Bradley23ORCID,Mesinger Andrei4ORCID

Affiliation:

1. School of Physics, Korea Institute for Advanced Study (KIAS) , 85 Hoegiro, Dongdaemun-gu, Seoul 02455, Republic of Korea

2. ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D), University of Melbourne , VIC 3010, Australia

3. School of Physics, The University of Melbourne , Parkville, VIC 3010, Australia

4. Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa, Italy

Abstract

ABSTRACT The excursion set reionization framework is widely used due to its speed and accuracy in reproducing the 3D topology of reionization. However, it is known that it does not conserve photon number. Here, we introduce an efficient, on-the-fly recipe to approximately account for photon conservation. Using a flexible galaxy model shown to reproduce current high-z observables, we quantify the bias in the inferred reionization history and galaxy properties resulting from the non-conservation of ionizing photons. Using a mock 21-cm observation, we perform inference with and without correcting for ionizing photon conservation. We find that ignoring photon conservation results in very modest biases in the inferred galaxy properties for our fiducial model. The notable exception is in the power-law scaling of the ionizing escape fraction with halo mass, which can be biased from the true value by ∼2.4σ (corresponding to ∼−0.2 in the power-law index). Our scheme is implemented in the public code 21cmFAST.

Funder

Australian Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Inferring reionization and galaxy properties from the patchy kinetic Sunyaev–Zel’dovich signal;Monthly Notices of the Royal Astronomical Society;2023-09-28

2. Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations;The Astrophysical Journal;2023-03-01

3. Modeling cosmic reionization;Living Reviews in Computational Astrophysics;2022-11-28

4. A short introduction to reionization physics;General Relativity and Gravitation;2022-09

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