IRAS Explanatory Supplement
VI. Flux Reconstruction and Calibration
Chapter Contents | Introduction | Authors | References
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Chapter VI Contents
- Processing - Removal of Telescope Transfer Function
- Determination of Relative Flux
- Overall Procedure to Determine Relative Photometry
- Photometry of Point Sources and Small Extended Sources
- Photometry of Extended Emission
- Absolute Calibration
- Comparison of IRAS Observations with Ground Based Observations
IntroductionThree quite separate functions must be performed in order to reconstruct the flux of a source from the telescope data stream. first, the effects of the telescope transfer function must be removed from the data. Second, the results must be transferred to relative photometric units. In the case of IRAS, this amounted to establishing the relationship between source amplitudes observed during the survey scans and outputs of flashes of the internal reference source. Third, the relative photometry must be put on an absolute scale, i.e., the flashes of the internal reference source must be calibrated in an absolute sense.
In the following discussion, the processing by which the signal received at the ground station was converted to the effective detector current is described, followed by the description of the process by which the relative and, finally, the absolute photometry was achieved.
Authors:G. Neugebauer, S. Wheelock, F. Gillett, H.H. Aumann, T.N. Gautier, F.J. Low, P. Hacking, M. Hauser, S. Harris, P. Clegg.
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