Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
Volume 28, Issue 1, Pages 46-57Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1071/AS10023
Keywords
cosmology: diffuse radiation; methods: data analysis
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Funding
- Australian Research Council [LE0775621, LE0882938, DP0877954]
- U.S. National Science Foundation [AST-0457585]
- Smithsonian Astrophysical Observatory
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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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