Optimal enhancement of features in digital spectra

Optimal enhancement of features in digital spectra

The optimization of spectral data processing in astronomy by the use of median digital filters is described. The approach is to use a spatial frequency filtering algorithm to eliminate, in this case, extragalactic background contaminants. The algorithm works in terms of the median of the input at ea...

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Veröffentlicht in:The Astronomical journal 1985-03, Vol.90, p.522-532
Hauptverfasser: Sulentic, J. W., Arp, H., Lorre, J.
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container_title The Astronomical journal
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creator Sulentic, J. W.
Arp, H.
Lorre, J.
description The optimization of spectral data processing in astronomy by the use of median digital filters is described. The approach is to use a spatial frequency filtering algorithm to eliminate, in this case, extragalactic background contaminants. The algorithm works in terms of the median of the input at each pixel in relation to a cumulative histogram of all pixels. The cleaned image field then retains otherwise obliterated faint spectral features. Sample optimal spectra for knot C of the M87 jet and the interacting galaxies NGC 5679ab are treated with the algorithm to demonstrate the faint emission lines which are retrievable.
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title Optimal enhancement of features in digital spectra
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