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Title: Study of redshifted H I from the epoch of reionization with drift scan
Authors: Paul, Sourabh
Sethi, S.K.
Subrahmanyan, Ravi
Udaya Shankar, N.
Dwarakanath, K.S.
Deshpande, A.A.
Srivani, K.S.
+25 Co-authors
Issue Date: 20-Sep-2014
Publisher: IOP Sciences for The American Astronomical Society
Citation: Astrophysical Journal, 2014, Vol.793, p 28
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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations
ISSN: 0004-637X
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Copyright: 2014 American Astronomical Society, This article may be downloaded for personal use only. Any other use requires prior permission of the author and The American Astronomical Society
Appears in Collections:Research Papers (A&A)

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