Probing the intergalactic medium during the Epoch of Reionization using 21 cm signal power spectra

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Table 1.

List and description of the eight parameters used to model the redshift evolution of the EoR 21 cm brightness temperature power spectrum $Δ_{δ T_{b}}^{2}$ $\Delta^2_{\delta T_{\rm b}}$ .

Parameters	Description
z₀	Redshift corresponding to ${\bar{x}}_{HI} = 0.5$ $\overline{x}_{\mathrm{HI}}=0.5$ .
Δz	Redshift range of reionization in a tanh model.
α₀	Asymmetry parameter around ${\bar{x}}_{HI} = 0.5$ $\overline{x}_{\mathrm{HI}}=0.5$ in the redshift evolution of ${\bar{x}}_{HI}$ $\overline{x}_{\mathrm{HI}}$ .
A_⋆	Maximum value of the bias at k = 0.05 h Mpc⁻¹.
${\bar{x}}_{HI, ⋆}$ $\overline{x}_{\mathrm{HI},\star}$	Mean neutral fraction at the redshift when the bias at k = 0.05 h Mpc⁻¹ gets the maxima.
α_A	Power-law index on ${\bar{x}}_{HI}$ $\overline{x}_{\mathrm{HI}}$ which accounts for the change of bias as a function of ${\bar{x}}_{HI}$ $\overline{x}_{\mathrm{HI}}$ at k = 0.05 h Mpc⁻¹.
γ_c	Account for the change in scale-dependence of bias with ${\bar{x}}_{HI}$ $\overline{x}_{\mathrm{HI}}$ .
γ₀	Account for the all-scale feature of bias in addition to small-scale feature 1/[1 + (k/0.3)^1.5] at stages with ${\bar{x}}_{HI} \to 0$ $\overline{x}_{\mathrm{HI}} \rightarrow 0$ .

Notes. Here bias represents the ratio of δT_b to density power spectra $Δ_{δ T_{b}}^{2} / Δ_{δ δ}^{2}$ $\Delta^2_{\delta T_{\rm b}}/\Delta^2_{\delta\delta}$ .

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