Statistics – Applications
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..64h&link_type=abstract
"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T
Statistics
Applications
Scientific paper
The Detector Characterization Laboratory at NASA/GSFC has investigated the count-rate non-linearity (reciprocity failure) characteristics of 1.7 micron cut-off HgCdTe devices that are very similar to the WFC3 IR detector. The reciprocity failure follows a power law behavior over the range of fluxes tested (0.1-104 photons/ second). The slope of the power law varies among detectors, ranging from 0.3- 1% dex at 1.1micron, which is much smaller than the 6% dex effect observed with the HST NICMOS 2.5 micron cut-off detectors. Reciprocity failure is nevertheless an important effect in the calibration of WFC3 data, as well as in other applications in which there is a large difference in flux between the photometric standards and the scientific sources of interest. Furthermore, the variation among detectors demonstrates that demonstrates that a measurement made with the WFC3 IR detector is necessary in order to provide a proper calibration of the WFC3 IR data.
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