Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230...97m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Jan. 1, 1988, p. 97-106. SERC-supported research.
Astronomy and Astrophysics
Astronomy
12
Astronomical Photography, Digital Techniques, Elliptical Galaxies, Microdensitometers, Photographic Plates, Radio Galaxies
Scientific paper
Presented are some preliminary results on digital coaddition using a one degree square area of nine UK Schmidt plates, incorporating the giant elliptical radio galaxy IC 4296, which were digitized using a PDS microdensitometer. The results obtained show the technique to work at least as well as the direct photographic coaddition. The added advantages of digital coaddition compared to photographic coaddition are in the better alignment obtainable together with the ability to perform various digital manipulations of the field and the greater resolution achieved in the coadded PDS frames. The data have been intensity-calibrated using CCD frames of IC 4296, and indicate that for these measurements the smallest detectable image has a magnitude of ≈24 and diffuse objects are detectable down to μ = 29 mag arcsec-2. The possibilities of the technique plus some of the results so far obtained are discussed.
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