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Improvements in the IRAS Calibration by Separation of the Different Infrared Surface Brightness Components

Published online by Cambridge University Press:  08 February 2017

D. J. M. Kester ,
P. R. Wesselius  and
S. D. Price
D. J. M. Kester
Affiliation:
Space Research, P.O. Box 800 9700 AV Groningen The Netherlands
P. R. Wesselius
Affiliation:
Space Research, P.O. Box 800 9700 AV Groningen The Netherlands
S. D. Price
Affiliation:
AFGL Hanscom Air Force Base Massachusetts 01731 USA

Abstract

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A new calibration has been developed for GEISHA (Groningen Exportable Infrared System for High-Resolution Analysis) employing the zodiacal emission that is clearly present in each long scan. We have assumed, because of several other fundamental IRAS studies, that the zodiacal emission as a whole (ZEM) can be approximated by the emission of a tilted oblate ellipsoid emitting at a certain effective brightness. Besides this zodiacal emission, there is always a contribution of the galactic emission (GEM). As a standard candle, we take the sum of ZEM and GEM. We allow the electronic baseline to change linearly over a scan. We assume that the slow exponential decay that occurs will be sufficiently approximated by a straight line. The nonlinear behavior of the gain is corrected by a model developed in Groningen.

Type
II. Galactic Background Starlight from UV to IR: Observations and Models
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 115 - 117
Copyright
Copyright © Kluwer 1990 

References

REFERENCES

IRAS Catalogs and Atlases, Explanatory Supplement Volume I 1988, ed. Beichman, C.A., Neugebauer, N., Habing, H.J., Clegg, P.E., Chester, T.J. NASA RP-1190, U.S. Government Printing Office, Washington, D.C. Google Scholar