NICMOS Time Dependent Flat-fields

Details NICMOS Time Dependent Flat-fields NICMOS Time Dependent Flat-fields

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nicm.rept....2d&link_type=abstract

Instrument Science Report NICMOS 2007-002, 11 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos, Flat-Fields, Epoch Flat-Fields

Scientific paper

We use data obtained during the NICMOS flat-field monitoring 2002-2007 to derive a setof time dependent flat-fields. These "epoch" flat-fields are compared to the current pipeline flat-fields and differences are quantified. Our results are consistent with a decrease in DQE over the five-year period on the order of one per cent. We also find that the spatial structure of the flat-fields change with time. The reasons for these changes arenot fully known, but we note that the changes are consistent with a change in detector temperature with time. The order of this effect is generally less than one percent. The "epoch" flat-fields are available on the NICMOS web page.

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