Optimal enhancement of features in digital spectra

Details Optimal enhancement of features in digital spectra Optimal enhancement of features in digital spectra

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..522s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, March 1985, p. 522-532. Research supported by the Research Corp. and University

Astronomy and Astrophysics

Astronomy

10

Astronomical Spectroscopy, Digital Data, Digital Filters, Emission Spectra, Image Processing, Optimization, Algorithms, Background Radiation, Data Reduction, Galaxies, Histograms, Interacting Galaxies

Scientific paper

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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