Minimum-component baselines: Fourier analysis for continuum assessment

Details Minimum-component baselines: Fourier analysis for continuum assessment Minimum-component baselines: Fourier analysis for continuum assessment

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..122..371w&link_type=abstract

A & A Supplement series, Vol. 122, April II 1997, 371-380.

Astronomy and Astrophysics

Astronomy

Methods: Data Analysis: Numerical, Techniques: Image Processing

Scientific paper

This describes a technique for fitting baselines or continua to scans or spectra with a large proportion occupied by signal in the form of sources or emission/absorption lines. It is essentially a high-pass filtering technique; the very lowest Fourier frequencies are ``filtered out" by using them to construct a model of the continuum. The technique is interactive, and subjective in that some decision is required by the analyst; but it is very stable despite this. Errors are analyzed and some examples are given to demonstrate the versatility of the technique. The route to generating an objective (hands-off) technique is discussed.

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