Expected constraints on models of the epoch of reionization with the variance and skewness in redshifted 21cm-line fluctuations

Abstract

Redshifted 21cm-line signal from neutral hydrogens in the intergalactic medium (IGM) gives a direct probe of the epoch of reionization (EoR). In this paper, we investigate the potential of the variance and skewness of the probability distribution function of the 21cm brightness temperature for constraining EoR models. These statistical quantities are simple, easy to calculate from the observed visibility and thus suitable for the early exploration of the EoR with ongoing telescopes such as the Murchison Widefield Array (MWA) and LOw Frequency ARray (LOFAR). We show, by performing Fisher analysis, that the variance and skewness at $z=7-9$ are complementary to each other to constrain the EoR model parameters such as the minimum virial temperature of halos which host luminous objects, ionizing efficiency and mean free path of ionizing photons in the IGM. Quantitatively, the constraining power highly depends on the quality of the foreground subtraction and calibration. We give a best case estimate of the constraints on the parameters, neglecting the systematics other than the thermal noise.

9 pages, 7 figures, accepted to PASJ

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Cited by in corpus (18)

• Quantifying the non-Gaussianity in the EoR 21-cm signal through bispectrum
• Analysing the 21cm signal from the Epoch of Reionization with artificial neural networks
• Constraining the EoR model parameters with the 21cm bispectrum
• Redshifted 21-cm Bispectrum I: Impact of the Redshift Space Distortions on the Signal from the Epoch of Reionization
• Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
• Redshifted 21-cm bispectrum II: Impact of the spin temperature fluctuations and redshift space distortions on the signal from the Cosmic Dawn
• Detectability of 21cm-signal during the Epoch of Reionization with 21cm-Lyman-$\alpha$ emitter cross-correlation. I
• The Epoch of Reionization 21-cm Bispectrum: The impact of light-cone effects and detectability
• Investigating X-ray sources during the epoch of reionization with the 21 cm signal
• Exploring the cosmic dawn and epoch of reionization with 21cm line
• Detecting the non-Gaussianity of the 21-cm signal during reionisation with the Wavelet Scattering Transform
• Detectability of 21cm-signal during the Epoch of Reionization with 21cm-Lyman-α emitter cross-correlation. II. Foreground contamination
• Redshifted 21-cm bispectrum: Impact of the source models on the signal and the IGM physics from the Cosmic Dawn
• Quantiles as Robust Probes of Non-Gaussianity in 21-cm Images
• Impact of the Epoch of Reionization sources on the 21-cm bispectrum
• Measurements of one-point statistics in 21 cm intensity maps via foreground avoidance strategy
• Impact of astrophysical scatter on the Epoch of Reionization [H I]${}_{21cm}$ bispectrum
• Exploring One-point Statistics in HERA Phase I Data: Effects of Foregrounds and Systematics on Measuring One-Point Statistics