University of Sussex
Browse
__smbhome.uscs.susx.ac.uk_akj23_Documents_SRO 3.pdf (747.14 kB)

A method to determine the evolution history of the mean neutral hydrogen fraction

Download (747.14 kB)
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 Sarkar
The 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: Letters

ISSN

1745-3933

Publisher

Oxford University Press

Issue

1

Volume

483

Page range

L109-L113

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-01-18

First Open Access (FOA) Date

2019-01-18

First Compliant Deposit (FCD) Date

2019-01-17

Usage metrics

    University of Sussex (Publications)

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC