Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..107...55s&link_type=abstract
Astronomy and Astrophysics Suppl. 107, 55-69 (1994)
Astronomy and Astrophysics
Astrophysics
13
Methods: Data Analysis, Techniques: Image Processing
Scientific paper
Continuum emission is often a viewed as a contaminant in radio interferometric spectral-line imaging. At best, it makes the analysis of the spectral-line images difficult. At worst, it limits the dynamic range of the images. In recent papers, van Langevelde & Cotton (1990) introduced a visibility-based continuum subtraction technique to radio interferometry, and Cornwell et al. (1992) analysed its properties. The technique is based on modelling the continuum by a first-order polynomial in the visibility spectrum. We present a quantitative analysis of the technique, both in terms of the residual continuum and the sensitivity to noise. The analysis is for polynomial fits of arbitrary order. A less complete analysis of a related, image-based, continuum subtraction technique is also presented. We show that higher order polynomials can be useful for data with large field size and bandwidth, and that stability in the presence of noise is not a problem. Some errors in the papers cited above are corrected.
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