English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Redshifted 21cm signal is a promising tool to investigate the state ofintergalactic medium (IGM) in the Cosmic Dawn (CD) and Epoch ofReionization(EoR). In our previous work (Shimabukuro et al 2015), we studiedthe variance and skewness to give a clear interpretation of 21cm power spectrumand found that skewness is a good indicator of the epoch when X-ray heatingbecomes effective. Thus, the non-Gaussian feature of the spatial distributionof the 21cm signal is expected to be useful to investigate the astrophysicaleffects in the CD and EoR. In this paper, in order to investigate such anon-Gaussian feature in more detail, we focus on the bispectrum of the 21cmsignal. It is expected that the 21cm brightness temperature bispectrum isproduced by non-gaussianity due to the various astrophysical effects such asWouthysen-Field (WF) effect, X-ray heating and reionization. We study thevarious properties of 21cm bispectrum such as scale dependence, shapedependence and redshift evolution. And also we study the contribution from eachcomponent of 21cm bispectrum. We find that the contribution from each componenthas characteristic scale-dependent feature, and it is expected that we couldobtain more detailed information on the IGM in the CD and EoR by using the 21cmbispectrum in the future experiments, combined with the power spectrum andskewness.

21cm-line bispectrum as method to probe Cosmic Dawn and Epoch of Reionization