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Title: A STUDY OF FUNDAMENTAL LIMITATIONS TO STATISTICAL DETECTION OF REDSHIFTED H I FROM THE EPOCH OF REIONIZATION

In this paper, we explore for the first time the relative magnitudes of three fundamental sources of uncertainty, namely, foreground contamination, thermal noise, and sample variance, in detecting the H I power spectrum from the epoch of reionization (EoR). We derive limits on the sensitivity of a Fourier synthesis telescope to detect EoR based on its array configuration and a statistical representation of images made by the instrument. We use the Murchison Widefield Array (MWA) configuration for our studies. Using a unified framework for estimating signal and noise components in the H I power spectrum, we derive an expression for and estimate the contamination from extragalactic point-like sources in three-dimensional k-space. Sensitivity for EoR H I power spectrum detection is estimated for different observing modes with MWA. With 1000 hr of observing on a single field using the 128 tile MWA, EoR detection is feasible (S/N >1 for k ∼< 0.8 Mpc{sup –1}). Bandpass shaping and refinements to the EoR window are found to be effective in containing foreground contamination, which makes the instrument tolerant to imaging errors. We find that for a given observing time, observing many independent fields of view does not offer an advantage over a singlemore » field observation when thermal noise dominates over other uncertainties in the derived power spectrum.« less
Authors:
; ;  [1] ; ; ;  [2] ; ;  [3] ;  [4] ; ;  [5] ; ;  [6] ; ;  [7] ; ;  [8] ;  [9] ;  [10] ;  [11] more »; « less
  1. Raman Research Institute, Bangalore (India)
  2. Curtin University, Perth (Australia)
  3. Harvard-Smithsonian Center for Astrophysics, Cambridge (United States)
  4. Arizona State University, Tempe, AZ (United States)
  5. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Sydney (Australia)
  6. CSIRO Astronomy and Space Science, NSW (Australia)
  7. MIT Haystack Observatory, Westford, MA (United States)
  8. MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA (United States)
  9. University of Washington, Seattle, WA (United States)
  10. Victoria University of Wellington, Wellington (New Zealand)
  11. University of Wisconsin-Milwaukee, Milwaukee, WI (United States)
Publication Date:
OSTI Identifier:
22270885
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 776; 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; ASTRONOMY; ASTROPHYSICS; DETECTION; ENERGY SPECTRA; GALAXIES; HYDROGEN; NOISE; RED SHIFT; SENSITIVITY; SPACE; STARS; TELESCOPES; UNIVERSE