Camera 3 Intrapixel Sensitivity

Details Camera 3 Intrapixel Sensitivity Camera 3 Intrapixel Sensitivity

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nicm.rept....5s&link_type=abstract

Instrument Science Report NICMOS-99-005, 13 pages

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

Scientific paper

The NICMOS detectors have significant sensitivity variation across individual pixels, and particularly at the pixel edges. This variation is different for each pixel. While this variation causes an overall loss of sensitivity in cameras that oversample the point-spread function (PSF), it can result in significant photometric errors when the PSF is undersampled, as is the case with NIC3. In this ISR we define the problem (up to 30% flux variation among individual images of a point source) and suggest solutions to correct the photometry of point sources in images taken through the F110W (J) and F160W (H) filters. A method of correcting the photometry based on the ratio of the flux in the peak pixel to the flux in the whole PSF is explained in detail. This method avoids the centroiding problems inherent in other correction methods, and gives a slightly smaller spread in the resulting photometry-- 2s=0.06 mag at J, and 0.07 mag at H, during the NIC3 campaigns. This correction is to the average value detected among the test population, to conform to observations of extended targets. We also review how to correct GRISM spectra for light lost as the spectrum moves from row to row. Although these procedures work well with individual images, we strongly recommend at least three dither positions of each field or object, with at least ten pixels of motion between positions.

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