A comment on image detection and the definition of limiting magnitude

Details A comment on image detection and the definition of limiting magnitude A comment on image detection and the definition of limiting magnitude

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..949h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Aug. 1990, p. 949-953. Research supported by NSERC

Astronomy and Astrophysics

Astronomy

27

Astronomical Photometry, Charge Coupled Devices, Image Transducers, Signal To Noise Ratios, Stellar Luminosity, Apertures, Background Noise, Brightness, Computerized Simulation, Imaging Techniques

Scientific paper

A useful operating definition for limiting magnitude in CCD photometry is the level at which the completeness of detection drops to 50 percent. If the detection threshold is defined as Q times the standard deviation of the sky noise, then it can be shown that the Q value needed to reach a given limiting magnitude, or signal-to-noise ratio (SNR), varies inversely with the scale of the detector. In addition, the highest achievable threshold Q (lim) for any image scale is numerically equal to the SNR of the stars just at the 50 percent completeness limit.

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