NICMOS IntraPixel Sensitivity

Details NICMOS IntraPixel Sensitivity NICMOS IntraPixel Sensitivity

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nicm.rept....9x&link_type=abstract

Instrument Science Report NICMOS 2003-009, 11 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

A study of the NICMOS (Camera 3) intrapixel sensitivity is carried out after installation of cryo-cooler in Cycle 11. The consistency of the procedure adopted here is tested by applying it to the data in Cycle 7, as analyzed by Storrs et al (1999), and reproducing their results. The intrapixel sensitivity in Cycle 11 is then measured and compared to that in Cycle 7 (before the installation of the NICMOS cryo-cooler). We find 27% decrease in the intrapixel sensitivity from Cycle 7 to Cycle 11 for both F110W (J-band) and F160W (Hband) filters. The possibility of this effect being due to an increase in the stellar PSF over this period is considered and discarded, as we only find 5% change in the PSF between the two cycles.

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