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.
Probing IGM Physics during Cosmic Dawn using the Redshifted 21-cm Bispectrum
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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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The EoR 21-cm Bispectrum at $z=8.2$ from MWA data I: Foregrounds and preliminary upper limits
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.