Sensitivity for 21cm Bispectrum from Epoch of Reionization

Abstract

The 21cm line brightness temperature brings rich information about Epoch of Reionizaton (EoR) and high-$z$ universe (Cosmic Dawn and Dark Age). While the power spectrum is a useful tool to investigate the EoR signal statistically, higher-order statistics such as bispectrum are also valuable because the EoR signal is expected to be highly non-Gaussian. In this paper, we develop a formalism to calculate the bispectrum contributed from the thermal noise taking array configularion of telescopes into account, by extending a formalism for the power spectrum \cite{2006ApJ...653..815M}. We apply our formalism to the ongoing and future telescopes such as expanded Murchison Widefield Array (MWA), LOw Frequency ARray (LOFAR) and Square Kilometre Array (SKA). We find that expanded MWA does not have enough sensitivity to detect the bispectrum signal. On the other hand, LOFAR has better sensitivity and will be able to detect the peaks of the bispectrum as a function of redshift at large scales with comoving wavenumber $k\lesssim 0.03{\mathrm{Mpc}}^{-1}$. The SKA has enough sensitivity to detect the bispectrum for much smaller scales $k\lesssim 0.3{\mathrm{Mpc}}^{-1}$ and redshift $z\lesssim 20$

8 pages,2 figures, submitted to MNRAS

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Cited by in corpus (12)

• Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
• Science with the Murchison Widefield Array: Phase I Results and Phase II Opportunities
• Redshifted 21-cm bispectrum II: Impact of the spin temperature fluctuations and redshift space distortions on the signal from the Cosmic Dawn
• Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array
• The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization 21-cm power spectrum
• The impact of non-Gaussianity on the Epoch of Reionization parameter forecast using 21-cm power spectrum measurements
• The Epoch of Reionization 21-cm Bispectrum: The impact of light-cone effects and detectability
• Exploring the cosmic dawn and epoch of reionization with 21cm line
• Redshifted 21-cm bispectrum: Impact of the source models on the signal and the IGM physics from the Cosmic Dawn
• Studying neutral hydrogen structures during the epoch of reionization using fractal dimensions
• Skew spectrum and smoothed skewness of 21-cm signals from epoch of reionization
• The Impact of ionization Morphology and X-ray Heating on the Cosmological 21cm Skew Spectrum