STUDY OF REDSHIFTED H I FROM THE EPOCH OF REIONIZATION WITH DRIFT SCAN
Author(s)Cappallo, Roger J.; Corey, Brian E.; Goeke, Robert F.; Kratzenberg, Eric W.; Lonsdale, Colin John; McWhirter, Stephen R.; Rogers, Alan E. E.; Whitney, Alan R.; Hewitt, Jacqueline N.; Morgan, Edward H.; Williams, Christopher Leigh; ... Show more Show less
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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.
DepartmentHaystack Observatory; Kavli Institute for Astrophysics and Space Research
The Astrophysical Journal
Paul, Sourabh, Shiv K. Sethi, Ravi Subrahmanyan, N. Udaya Shankar, K. S. Dwarakanath, Avinash A. Deshpande, Gianni Bernardi, et al. “STUDY OF REDSHIFTED H I FROM THE EPOCH OF REIONIZATION WITH DRIFT SCAN.” The Astrophysical Journal 793, no. 1 (September 2, 2014): 28. © 2014 The American Astronomical Society
Final published version