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dc.contributor.authorPatwa, Akash K-
dc.contributor.authorSethi, S-
dc.contributor.authorDwarakanath, K S-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2021, Vol. 504, p2062-2072en_US
dc.identifier.issn1365-2966 (Online)-
dc.descriptionRestricted Access. An open-access version is available at (one of the alternative locations)en_US
dc.description.abstractThe detection of redshifted hyperfine line of neutral hydrogen (H i) is the most promising probe of the epoch of reionization (EoR). We report an analysis of 55 h of Murchison Widefield Array (MWA) phase II drift scan EoR data. The data correspond to a central frequency ν0=154.24MHz (z ≃ 8.2 for the redshifted H i hyperfine line) and bandwidth B=10.24MHz⁠. As one expects greater system stability in a drift scan, we test the system stability by comparing the extracted power spectra from data with noise simulations and show that the power spectra for the cleanest data behave as thermal noise. We compute the H i power spectrum as a function of time in one and two dimensions. The best upper limit on the 1D power spectrum are: Δ2(k)≃(1000 mK)2 at k ≃ 0.2h Mpc−1 and at k ≃ 1h Mpc−1. The cleanest modes, which might be the most suited for obtaining the optimal signal to noise, correspond to k ≳ 1h Mpc−1. We also study the time-dependence of the foreground-dominated modes in a drift scan and compare with the expected behaviour.en_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights2021 The Author(s)en_US
dc.subjectmethods: data analysisen_US
dc.subjectmethods: observationalen_US
dc.subjecttechniques: interferometricen_US
dc.subjectdark agesen_US
dc.subjectfirst starsen_US
dc.subjectearly Universeen_US
dc.titleExtracting the 21cm EoR signal using MWA drift scan dataen_US
Appears in Collections:Research Papers (A&A)

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