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Probing IGM Physics during Cosmic Dawn using the Redshifted 21-cm Bispectrum

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arxiv 2108.08201 v3 pith:WX2TTXN2 submitted 2021-08-18 astro-ph.CO

Mohd Kamran , Suman Majumdar , Raghunath Ghara , Garrelt Mellema , Somnath Bharadwaj , Jonathan R. Pritchard , Rajesh Mondal , Ilian T. Iliev This is my paper · ORCID
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keywords bispectrumcosmicdawnfirstluminousphysicsredshiftedsources
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abstract

With the advent of the first luminous sources at Cosmic Dawn (CD), the redshifted 21-cm signal, from the neutral hydrogen in the Inter-Galactic Medium (IGM), is predicted to undergo a transition from absorption to emission against the CMB. Using simulations, we show that the redshift evolution of the sign and the magnitude of the 21-cm bispectrum can disentangle the contributions from Ly$\alpha$ coupling and X-ray heating of the IGM, the two most dominant processes which drive this transition. This opens a new avenue to probe the first luminous sources and the IGM physics at CD.

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  1. The EoR 21-cm Bispectrum at $z=8.2$ from MWA data I: Foregrounds and preliminary upper limits

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    Using 17 minutes of MWA data, the authors place the first comprehensive upper limits on the z=8.2 21-cm bispectrum and characterize its foreground wedge.

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