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dc.contributor.authorMondal, Rajesh-
dc.contributor.authorShaw, Abinash Kumar-
dc.contributor.authorSarkar, Anjan Kumar- Co-Authors-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2020, Vol.494, p4043–4056en_US
dc.identifier.issn1365-2966 (online)-
dc.descriptionOpen Accessen_US
dc.description.abstractThe light-cone effect causes the mean as well as the statistical properties of the redshifted 21-cm signal Tb(n^,ν) to change with frequency ν (or cosmic time). Consequently, the statistical homogeneity (ergodicity) of the signal along the line-of-sight (LoS) direction is broken. This is a severe problem particularly during the Epoch of Reionization (EoR) when the mean neutral hydrogen fraction ( x¯HI ) changes rapidly as the Universe evolves. This will also pose complications for large bandwidth observations. These effects imply that the 3D power spectrum P(k) fails to quantify the entire second-order statistics of the signal as it assumes the signal to be ergodic and periodic along the LoS. As a proper alternative to P(k), we use the multifrequency angular power spectrum (MAPS) Cℓ(ν1,ν2) , which does not assume the signal to be ergodic and periodic along the LoS. Here, we study the prospects for measuring the EoR 21-cm MAPS using future observations with the upcoming SKA-Low. Ignoring any contribution from the foregrounds, we find that the EoR 21-cm MAPS can be measured at a confidence level ≥5σ at angular scales ℓ ∼ 1300 for total observation time tobs ≥ 128 h across ∼44 MHz observational bandwidth. We also quantitatively address the effects of foregrounds on MAPS detectability forecast by avoiding signal contained within the foreground wedge in (k⊥,k∥) plane. These results are very relevant for the upcoming large bandwidth EoR experiments as previous predictions were all restricted to individually analysing the signal over small frequency (or equivalent redshift) intervals.en_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights2020 The Author(s)en_US
dc.subjecttechniques: interferometricen_US
dc.subjectcosmology: theoryen_US
dc.subjectdark agesen_US
dc.subjectfirst starsen_US
dc.subjectdiffuse radiationen_US
dc.subjectlarge-scale structure of Universeen_US
dc.titlePredictions for measuring the 21-cm multifrequency angular power spectrum using SKA-Lowen_US
Appears in Collections:Research Papers (A&A)

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