Computer Science
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept...28b&link_type=abstract
Instrument Science Report WFC3 2005-028, 13 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Ir Channel
Scientific paper
The WFC3/IR channel will combine sensitivity with a wide field of view, such that all long exposures will contain some saturated stars, even in sparse fields near the Galactic poles. Because such saturations in IR detectors can result in persistence (particularly when a pixel is over-saturated by factors of 10 to 100), I quantify here the frequency of 1x, 10x, and 100x saturations, as a function of position on the sky. I use the 2MASS and GSC2 catalogs for this analysis, although each has its limitations for this purpose. Away from the Galactic plane, the greater depth of the GSC2 is required to quantify the frequency of moderate saturations (1-10x). If, however, one is only interested in extreme saturations (>100x), the 2MASS catalog is more appropriate, because it is sufficiently deep for such sources and it avoids the large systematic errors (by factors of 200) that can arise due to an incorrect assumption of spectral type and extinction when extrapolating from the GSC2 optical bands into the IR. Both catalogs suffer from serious incompleteness in the Galactic plane, especially toward the Galactic center, but for such fields the 2MASS catalog would still be preferred over the GSC2 when checking for saturating objects.
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