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| Paper: |
A Practical Demonstration of Self-Calibration of NICMOS HDF North and South Data |
| Volume: |
281, Astronomical Data Analysis Software and Systems XI |
| Page: |
217 |
| Authors: |
Arendt, Richard G.; Fixsen, Dale J.; Moseley, S. Harvey |
| Abstract: |
The Hubble Space Telescope (HST) Near Infrared Camera and Multi-Object Spectrometer (NICMOS) observations of the Hubble Deep Field-North (HDF-N) and Hubble Deep Field-South (HDF-S) are used as a test case for application of a least-squares self-calibration procedure. These data are well suited for self-calibration because the observations were dithered in a manner that provides fairly direct correlations between all the pixels of the detector. The data model we use in the self-calibration procedure explicitly includes the sky intensity, the detector gains (flat field), the detector offsets (darks), and a large-scale temporally-variable offset, in this case an offset per detector quadrant per frame which allows modeling of the ``pedestal'' effect of the NICMOS camera. By applying the self-calibration to the combined HDF-N and HDF-S data set, the detector properties and sky intensities are derived and their uncertainties are formally calculated. |
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