STUDY OF REDSHIFTED H i FROM THE EPOCH OF REIONIZATION WITH DRIFT SCAN
Date
2014
Authors
Paul, S
Sethi, Shiv K
Subrahmanyan, Ravi
Shankar, N.Udaya
Dwarakanath, K S
Deshpande, Avinash
Bernardi, Gianni
Bowman, J D
Briggs, Franklin
Waterson, Mark
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Volume Title
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IOP Publishing
Abstract
Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr for an interferometer array such as the Murchison Widefield Array, which has a wide primary beam. We estimate the EoR power based on a cross-correlation of visibilities over time and show that the drift scan strategy is capable of detecting the EoR signal with a signal to noise that is comparable/better compared to the tracking case. We also estimate the visibility correlation for a set of bright point sources and argue that the statistical inhomogeneity of bright point sources might allow their separation from the EoR signal
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Source
The Astrophysical Journal
Type
Journal article
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Open Access