The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 46 Issue 1
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- Pages.30.3-30.3
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- 2021
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- 1226-2692(pISSN)
On-the-fly ionizing photon non-conservation correction for the Excursion-set reionization models
- Park, Jaehong (Korea Institute for Advanced Study (KIAS)) ;
- Greig, Bradley (University of Melbourne) ;
- Mesinger, Andrei (Scuola Normale Superiore)
- Published : 2021.04.13
Abstract
In order to generate the 3D structure of the 21-cm signal during the reionization, semi-numerical simulations based on Excursion set formalism are broadly used. However, semi-numerical simulations in the realization of the 3D structure are known to be the ionizing photon non-conserving by the structure of the Excursion set approach. Recently, explicit photon conserving algorithms for semi-numerical simulations introduced, but they are still too slow when forward modelling the 21-cm signal with high-dimensional parameter spaces. Here, we introduce a new method for approximately correcting photon non-conservation, which can be applied on-the-fly. This method is tailored towards the efficient simulation and Bayesian inference with high-dimensional parameter space. Then, we investigate how large an impact that photon non-conservation has on astrophysical parameter inference by performing an MCMC analysis. We find that the ionizing escape parameter is deviated from the fiducial value by 2 sigma when we infer astrophysical parameters without this correction.
Keywords