Other
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..557c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Feb. 1, 1987, p. 557-566.
Other
28
Astronomical Photography, Astronomical Photometry, Calibrating, Galaxies, Image Analysis, Automation, Error Analysis
Scientific paper
Two-dimensional surface photometry of a very large number of galaxies on a deep Schmidt plate has been obtained using the Automatic Plate Measuring system (APM). A method of photometric calibration, suitable for APM measurements, via pixel-by-pixel comparison with CCD frames of a number of the brighter galaxies is described, and its advantages are discussed. The same method is used to demonstrate the consistency of measurement of the APM machine when used for surface photometry. For galaxy surface brightness below 22.5 B(mu), errors introduced by the machine measuring process are found to be small enough to allow the possibility of 10-percent (0.1-mag) accuracy in the photometry. This means that, at low surface brightness, machine-induced errors are as small as a number of other effects inherent in all galaxy surface photometry, and thus do not compromise the vast-multiplexing advantage of being able to measure all the galaxies in a photographic plate simultaneously.
Cawson G. M. M.
Disney Michael J.
Kibblewhite Edward J.
Phillipps Steve
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