Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept...19m&link_type=abstract
Instrument Science Report WFC3 2008-19, 10 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Intrapixel Sensitivity Variation, Ipsv, Test Vacuum 2, Tv2
Scientific paper
We derive an approximate intrapixel sensitivity variation (IPSV) of the IR-1 detector of WFC3 from ground-test imagery. The purpose was to assess whether additional testing of this sort should be performed in Thermal Vacuum 3 (TV3) testing, scheduled to commence in February 2008. Whereas NICMOS exhibits IPSV as large as 40%, peak to valley, in the photometry of stars observed in J band with the NIC3 detector (Lauer 1999), WFC3 IR is expected to show much smaller IPSV and the results reported here confirm that expectation, with IPSV less than 8% peak to valley, or 1.6% rms, for a PSF similar to that expected on orbit for WFC IR at ~1 micron. The results reported here are based upon data from a test that was not intended for the purpose of measuring IPSV and hence should be considered preliminary. Given the limited precision of the results reported here, we designed additional tests of IPSV and implemented them in TV3 on the flight detector (IR-4), results of which will be described in a subsequent report, WFC3
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