Study of redshifted H I from the epoch of reionization with drift scan

Study of redshifted H I from the epoch of reionization with drift scan

The 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 as compared to the case where a single patch of sky is track...

Full description

Bibliographic Details
Main Authors: Paul, S., Sethi, S., Subrahmanyan, R., Udaya Shankar, N., Dwarakanath, K., Deshpande, A., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R., Corey, B., Emrich, David, Gaensler, B., Goeke, R., Greenhill, L., Hazelton, B., Hewitt, J., Johnston-Hollitt, M., Kaplan, D., Kasper, J., Kratzenberg, E., Lonsdale, C., Lynch, Mervyn, McWhirter, S., Mitchell, D., Morales, M., Morgan, E., Oberoi, D., Ord, Stephen, Prabu, T., Rogers, A., Roshi, A., Srivani, K., Tingay, Steven, Wayth, Randall, Webster, R., Whitney, A., Williams, Andrew, Williams, C.
Format: Journal Article
Published: Institute of Physics Publishing 2014
Online Access:http://hdl.handle.net/20.500.11937/9281
Description
Summary:The 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 as 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 (MWA), which has a wide primary beam. We estimate the EoR power based on cross-correlation of visibilities across time and show that the drift scan strategy is capable of the detection of the EoR signal with comparable/better signal-to-noise as 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.

Similar Items