Recovering line profiles from frequency-switched spectra

Details Recovering line profiles from frequency-switched spectra Recovering line profiles from frequency-switched spectra

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..124..183l&link_type=abstract

A & A Supplement series, Vol. 124, July 1997, 183-188.

Astronomy and Astrophysics

Astronomy

6

Techniques, Image Processing, Methods: Observational, Methods: Data Analysis

Scientific paper

The usual shift and subtract algorithm for recovering line profiles from frequency-switched data succeeds only when the switching interval exceeds the extent of the signal-bearing region. Nonetheless, noiseless spectra can in principle be reconstructed without error for any frequency-switching interval of at least one channel. This work presents a simple recursive algorithm which recovers line profiles from spectra which might otherwise appear hopelessly damaged, with only a slight cost in signal/noise. It is functionally equivalent to the dual-beam restoration algorithm of \cite[Emerson et al. (1979]{eme79}, A\&A {76}, 92) which is commonly used to map objects bigger than a telescope's beam throw.

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