Computer Science
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nicm.rept....5t&link_type=abstract
Instrument Science Report NICMOS 2009-005, 14 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos
Scientific paper
The bias-derived detector temperature for all three NICMOS cameras showed a variation of about ~2K in both the era before the installation of the NICMOS Cooling System (NCS) 1997-1998, as well as in the post-NCS era, 2002-2008. This temperature variation affected the detector quantum efficiency (DQE) and hence the structure of the flat-fields. In this ISR we discuss the creation of new temperature dependent flat-field reference files that correct for the effect of temperature on the DQE. Temperature dependent flat-fields (*_tdf.fits) populate the keyword TDFFILE in the headers of post-NCS data retrieved after November 19, 2008 and pre-NCS data retrieved after January 23, 2009. The temperature dependent flat-fields are used by the FLATCORR step in calnica version 4.4 and later. For consistency check we also created epoch dependent flatfields for postNCS data and compared them with the temperature dependent flatfields. The result of this analysis is also included here.
Dahlen Tomas
Thatte Deepashri
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