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 arXiv.org (one of the alternative locations
URI:	http://hdl.handle.net/2289/5990
ISSN:	0004-637X 1538-4357-(Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2014ApJ...793...28P http://arxiv.org/abs/1407.4620 http://dx.doi.org/10.1088/0004-637X/793/1/28
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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