Greig, Bradley and Prelogovic, David and Qin, Yuxiang and Ting, Yuan-Sen and Mesinger, Andrei (2024) Inferring astrophysical parameters using the 2D cylindrical power spectrum from reionization. Monthly Notices of the Royal Astronomical Society, 533 (2). pp. 2530-2545. ISSN 0035-8711, DOI https://doi.org/10.1093/mnras/stae1984.
Full text not available from this repository.Abstract
Enlightening our understanding of the first galaxies responsible for driving reionisation requires detecting the 21-cm signal from neutral hydrogen. Interpreting the wealth of information embedded in this signal requires Bayesian inference. Parameter inference from the 21-cm signal is primarily restricted to the spherically averaged power spectrum (1D PS) owing to its relatively straightforward derivation of an analytic likelihood function enabling traditional Monte-Carlo Markov-Chain (MCMC) approaches. However, in recent years, simulation-based inference (SBI) has become feasible which removes the necessity of having an analytic likelihood, enabling more complex summary statistics of the 21-cm signal to be used for Bayesian inference. In this work, we use SBI, specifically marginal neural ratio estimation to learn the likelihood-to-evidence ratio with Swyft, to explore parameter inference using the cylindrically averaged 2D PS. Since the 21-cm signal is anisotropic, the 2D PS should yield more constraining information compared to the 1D PS which isotropically averages the signal. For this, we consider a mock 1000 hr observation of the 21-cm signal using the SKA and compare the performance of the 2D PS relative to the 1D PS. Additionally, we explore two separate foreground mitigation strategies, perfect foreground removal and wedge avoidance. We find the 2D PS outperforms the 1D PS by improving the marginalised uncertainties on individual astrophysical parameters by up to similar to 30-40 per cent irrespective of the foreground mitigation strategy. Primarily, these improvements stem from how the 2D PS distinguishes between the transverse, k(perpendicular to), and redshift dependent, k(parallel to )information which enables greater sensitivity to the complex reionisation morphology.
| Item Type: | Article |
|---|---|
| Funders: | Australian Research Council (CE170100013) ; (DE220101520), Ministry of Education, Universities and Research (MIUR), Victorian Higher Education State Investment Fund, Victorian Government |
| Uncontrolled Keywords: | galaxies: high-redshift; intergalactic medium; dark ages, reionization, first stars; diffuse radiation; early Universe; cosmology: theory |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 14 Apr 2025 06:55 |
| Last Modified: | 14 Apr 2025 06:55 |
| URI: | http://eprints.um.edu.my/id/eprint/46598 |
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