Radio-interferometric imaging of spectral lines - The problem of continuum subtraction

Details Radio-interferometric imaging of spectral lines - The problem of continuum subtraction Radio-interferometric imaging of spectral lines - The problem of continuum subtraction

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..583c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 583-590.

Astronomy and Astrophysics

Astrophysics

84

Image Processing, Imaging Techniques, Line Spectra, Point Spread Functions, Radio Interferometers, Dynamic Range, Field Of View, Spatial Filtering

Scientific paper

We analyze two methods of continuum subtraction in radio interferometric imaging of spectral lines. These perform a linear fit to determine the continuum emission. In the two methods, UVLIN and IMLIN, the fitting is performed on the original visibilities and dirty images respectively. We find that both work very well when the continuum emission is spread over a small field of view and there are negligible instrumental errors. We give simple expressions for the typical error level for both methods in this regime. Both remain robust for significant instrumental errors in the sense that the dynamic range is then proportional to the peak line strength rather than the peak continuum strength. Hybrid methods consisting of one of these methods preceded by the conventionally used UVSUB method should work well when imaging emission spread over a large field of view. We show examples of the application of these methods, including a demonstration of the dangers inherent in the UVBAS method in which linear fits to the visibility amplitude and phase are performed.

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