Spectrophotometry and Imaging of AGNs from 2.5 to 11.6 μm

Details Spectrophotometry and Imaging of AGNs from 2.5 to 11.6 μm Spectrophotometry and Imaging of AGNs from 2.5 to 11.6 μm

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..965s&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 965

Physics

4

Isophot, Calibration, Data-Reduction

Scientific paper

We discuss the photometric calibration of ISOPHOT for point sources in the wavelength range from 3.2 to 240 μm for the aperture photometer (PHT-P) and the FIR camera section (PHT-C). To correct for temporal drifts of detector responsivities, all observations included reference measurements against stable internal sources. These have been absolutely calibrated in-orbit against well known celestial standards. In this process corrections were derived for instrumental effects like nonlinearities, signal-transients, time variable dark current or misalignments. For staring- or raster-observations of point sources in standard configurations, the scatter of the individual data points around the derived calibration relations is a measure of the consistency and typical accuracy of the calibration.

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