Computer Science
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept...15r&link_type=abstract
WFC3 Instrument Science Report 2011-15, 13 pages
Computer Science
Space Telescope Science Institute, Hubble Telescope, Hst, Wfpc3, Wide Field Camera 3
Scientific paper
We report the results from the CAL/WFC3 program 12335 to constrain the effect of count-rate non-linearity on the WFC3-IR detector by comparing the fluxes of 24 bright stars in asterisms observed with WFC3-IR and 2MASS. An incidental finding is an underestimate of the sample time of the first read for WFC3-IR (i.e., the zeroeth read) which is used to determine photometry for bright sources reaching saturation before the second read. After accounting for differences in zeropoint definitions and bandpass shapes, we find modest offsets of 0.02 ± 0.01 mag at 1.2 and 1.6 microns between the two systems refelecting either the level of systematic uncertainty or a true but not very significant difference. The count-rate non-linearity is less than 0.01 mag per dex, consistent with previous findings.
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