A morphological filter for removing 'Cirrus-like' emission from far-infrared extragalactic IRAS fields

Details A morphological filter for removing 'Cirrus-like' emission from far-infrared extragalactic IRAS fields A morphological filter for removing 'Cirrus-like' emission from far-infrared extragalactic IRAS fields

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1664a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1664-1678.

Astronomy and Astrophysics

Astronomy

10

Image Processing, Infrared Astronomy, Infrared Imagery, Interstellar Matter, Cosmic Dust, Gray Scale, Image Analysis

Scientific paper

The presence of diffuse extended IR emission from the Galaxy in the form of the so called 'Galactic Cirrus' emission has hampered the exploration of the extragalactic sky at long IR wavelengths. We describe the development of a filter based on mathematical morphology which appears to be a promising approach to the problem of cirrus removal. The method of Greyscale Morphology was applied to a 100 micron IRAS image of the M81 group of galaxies. This is an extragalactic field which suffers from serious contamination from foreground Galactic 'cirrus'. Using a technique called 'sieving', it was found that the cirrus emission has a characteristic behavior which can be quantified in terms of an average spatial structure spectrum or growth function. This function was then used to attempt to remove 'cirrus' from the entire image. The result was a significant reduction of cirrus emission by an intensity factor of 15 compared with the original input image. The method appears to preserve extended emission in the spatially extended IR disks of M81 and M82 as well as distinguishing fainter galaxies within bright regions of galactic cirrus. The techniques may also be applicable to IR databases obtained with the Cosmic Background Explorer.

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