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A method to determine the evolution history of the mean neutral hydrogen fraction
journal contribution
posted on 2023-06-09, 16:35 authored by Rajesh Mondal, Somnath Bharadwaj, Ilian IlievIlian Iliev, Kanan K Datta, Suman Majumdar, Abinash K Shaw, Anjan K SarkarThe light-cone (LC) effect imprints the cosmological evolution of the redshifted 21-cm signal Tb (n^,?) along the frequency axis which is the line of sight (LoS) direction of an observer. The effect is particularly pronounced during the Epoch of Reionization (EoR) when the mean hydrogen neutral fraction x HI (?) falls rapidly as the universe evolves. The multi-frequency angular power spectrum (MAPS) Cl(?1,?2) quantifies the entire second-order statistics of Tb (n^,?) considering both the systematic variation along ? due to the cosmological evolution and also the statistically homogeneous and isotropic fluctuations along all the three spatial directions encoded in n^ and ?. Here we propose a simple model where the systematic frequency (?1 ,?2) dependence of C l(?1,?2) arises entirely due to the evolution of x ¯ HI (?). This provides a new method to observationally determine the reionization history. Considering a LC simulation of the EoR 21-cm signal, we use the diagonal elements ? 1 =?2 of Cl(?1,?2) to validate our model. We demonstrate that it is possible to recover the reionization history across the entire observational bandwidth provided we have the value x ¯ HI at a single frequency as an external input.
Funding
ST/F002858/1
Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical Society: LettersISSN
1745-3933Publisher
Oxford University PressExternal DOI
Issue
1Volume
483Page range
L109-L113Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-01-18First Open Access (FOA) Date
2019-01-18First Compliant Deposit (FCD) Date
2019-01-17Usage metrics
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