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    Subtraction of Bright Point Sources from Synthesis Images of the Epoch of Reionization

    Access Status
    Open access via publisher
    Authors
    Pindor, B.
    Wyithe, J.
    Mitchell, D.
    Ord, Stephen
    Wayth, Randall
    Greenhill, L.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Pindor, B. and Wyithe, J.S.B. and Mitchell, D.A. and Ord, S.M. and Wayth, R.B. and Greenhill, L.J. 2011. Subtraction of Bright Point Sources from Synthesis Images of the Epoch of Reionization. Publications of the Astronomical Society of Australia. 28 (1): pp. 46-57.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1071/AS10023
    ISSN
    1323-3580
    School
    Curtin Institute of Radio Astronomy
    Remarks

    Copyright © 2011 Astronomical Society of Australia

    URI
    http://hdl.handle.net/20.500.11937/46168
    Collection
    • Curtin Research Publications
    Abstract

    Bright point sources associated with extragalactic active galactic nuclei and radio galaxies are an important foreground for low-frequency radio experiments aimed at detecting the redshifted 21-cm emission from neutral hydrogen during the epoch of reionization. The frequency dependence of the synthesized beam implies that the sidelobes of these sources will move across the field of view as a function of observing frequency, hence frustrating line-of-sight foreground subtraction techniques. We describe a method for subtracting these point sources from dirty maps produced by an instrument such as the MWA. This technique combines matched filters with an iterative centroiding scheme to locate and characterize point sources in the presence of a diffuse background. Simulations show that this technique can improve the dynamic range of epoch-of-reionization maps by 2–3 orders of magnitude.

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