Computer Science – Performance
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..979h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Oct. 15, 1984, p. 979-992.
Computer Science
Performance
83
Cosmology, Galactic Evolution, Galactic Radiation, Astronomical Photography, Astronomical Photometry, Calibrating, Luminous Intensity, Spatial Distribution, Telescopes
Scientific paper
A new observing technique has been developed that avoids the limits normally set by detector nonuniformities and achieves shot-noise limited performance with a CCD detector. The technique is described together with its application in determining the galaxy number-magnitude counts in three fields at high galactic latitude, each in two passbands. Counts are presented to an integrated density of 150,000 per square degree. The faintest objects that are detected at the 4.5 sigma level have a magnitude of KG = 25.9, which is equivalent to a Kron-Cousins RC magnitude of about 25.7 and a III aJ magnitude of approximately 27.0, and the counts are substantially complete to KG3 = 25.0. The counts are found to have a slope of 0.4, and the average galaxy color is constant for all magnitudes with an overall average of (KG3-I) = 0.89.
Hall Peter
Mackay Craig D.
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