Predicted [CII] power spectrum at z = 6. Three cases are shown, corresponding to three scenarios of SFRD at high z (see Lagache et al. 2018): high SFRD (dark blue), low SFRD (light blue), and the geometrical mean of the two (red). Only points with S/N > 1 are shown. S/Ns were computed considering A = 1.4 square degrees, tsurvey = 840 h, which corresponds to a total observation time of 1200 hours taking the overheads into account, and sensitivities as estimated in Sect. 4. The [CII] power spectra were derived from the modelling of CIB power spectra (Serra et al. 2016), using a conversion from SFR to [CII] that conservatively underestimates the [CII] luminosity by a factor of 6 at z = 5 compared to recent semi-analytical models (e.g. Lagache et al. 2018) or ALMA ALPINE measurements (Schaerer et al. 2020). Our estimates of [CII] power spectra are thus likely to be underestimated. The predicted [CII] power spectra from Yue & Ferrara 2019, using the local SFR-[CII] relation (black line) and Chung et al. 2020 (dashed black line) are also shown.
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