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    A study of fundamental limitations to statistical detection of redshifted H I from the epoch of reionization

    193923_98064_0004-637X_776TINGAY1.pdf (1.165Mb)
    Access Status
    Open access
    Authors
    Thyagarajan, Nithyanandan
    Udaya Shankar, N.
    Subrahmanyan, Ravi
    Arcus, Wayne
    Bernardi, Gianni
    Bowman, Judd
    Briggs, Frank
    Bunton, John
    Cappallo, Roger
    Corey, Brian
    deSouza, Ludi
    Emrich, David
    Gaensler, Brian
    Goeke, Robert
    Greenhill, Lincoln
    Hazelton, Bryna
    Herne, David
    Hewitt, Jacqueline
    Johnston-Hollitt, Melanie
    Kaplan, David
    Kasper, Justin
    Kincaid, Barton
    Koenig, Ronald
    Kratzenberg, Eric
    Lonsdale, Colin
    Lynch, Mervyn
    McWhirter, S. Russell
    Mitchell, Daniel
    Morales, Miguel
    Morgan, Edward
    Oberoi, Divya
    Ord, Stephen
    Pathikulangara, Joseph
    Remillard, Ronald
    Rogers, Alan
    Roshi, D. Anish
    Salah, Joseph
    Sault, Robert
    Srivani, K.
    Stevens, Jamie
    Thiagaraj, Prabu
    Tingay, Steven
    Wayth, Randall
    Waterson, Mark
    Webster, Rachel
    Whitney, Alan
    Williams, Andrew
    Williams, Christopher
    Wyithe, J. Stuart
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Thyagarajan, Nithyanandan and Udaya Shankar, N. and Subrahmanyan, Ravi and Arcus, Wayne and Bernardi, Gianni and Bowman, Judd D. and Briggs, Frank et el. 2013. A study of fundamental limitations to statistical detection of redshifted H I from the epoch of reionization. Astrophysical Journal. 776 (1): 6 (17 pp.).
    Source Title
    Astrophysical Journal
    DOI
    10.1088/0004-637X/776/1/6
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/6968
    Collection
    • Curtin Research Publications
    Abstract

    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−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 single field observation when thermal noise dominates over other uncertainties in the derived power spectrum.

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