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

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.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ;  [6] ; ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] more »; « less
  1. Raman Research Institute, Bangalore (India)
  2. Square Kilometre Array South Africa (SKA SA), 3rd Floor, The Park, Park Road, Pinelands 7405 (South Africa)
  3. Arizona State University, Tempe, AZ85281 (United States)
  4. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016 (Australia)
  5. MIT Haystack Observatory, Westford, MA 01886 (United States)
  6. Curtin University, Perth (Australia)
  7. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  8. University of Washington, Seattle, WA 98195 (United States)
  9. MIT Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, 37-241, Cambridge, MA 02139 (United States)
  10. Victoria University of Wellington, P.O. Box 600, Wellington 6140 (New Zealand)
  11. University of Wisconsin-Milwaukee, Milwaukee, WI 53201 (United States)
Publication Date:
OSTI Identifier:
22365029
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BEAMS; COMPARATIVE EVALUATIONS; CORRELATIONS; COSMOLOGY; DETECTION; INTERFEROMETERS; IONIZATION; NOISE; RED SHIFT; STABILITY; STARS; VISIBILITY