Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..207d&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 2, Dec. 1989, p. 207-214.
Astronomy and Astrophysics
Astronomy
4
Galactic Structure, Image Processing, Infrared Astronomy Satellite, Infrared Imagery, Sky Surveys (Astronomy), Milky Way Galaxy, Photographic Plates, Response Bias
Scientific paper
The IRAS survey detectors show nonlinear characteristics in their gains and baselines. This behavior can be described by an exponentially decaying gain enhancement, dependent on previously observed flux. The baseline behavior has been modeled by a decaying function composed of the sum of two exponential functions. The scale lengths are 10 arcmin and 1.1 deg for 12 microns, and 8 arcmin and 43 arcmin for 25 microns. Amplitude changes due to this type of hysteresis are less than 1 percent. In addition there is a considerable response of all detectors to particles associated with the South Atlantic Anomaly. Attempts to correct for this effect were performed on the 12- , 60- and 100-micron detectors in the form of bias boosts. This note presents a correction procedure for the 25-micron detectors.
Deul Erik R.
Walker Helen J.
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