WFC3: The Photometric Performance Of The UVIS And IR Cameras

Details WFC3: The Photometric Performance Of The UVIS And IR Cameras WFC3: The Photometric Performance Of The UVIS And IR Cameras

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546313b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #463.13; Bulletin of the American Astronomical Society, Vol. 42, p.496

Astronomy and Astrophysics

Astronomy

Scientific paper

The on-orbit throughput of WFC3 has been measured by observing bright spectrophotometric standard stars during SMOV4. For the UVIS channel, we observed the hot white dwarf GD 153 in 37 of 62 filters, and on the IR channel we observed both GD 153 and the solar analogue P330 in all 15 filters. Repeat measurements, at multiple dither positions, confirm that the throughput of both cameras is stable to <1% in wide and medium band filters. Relative to the calibrations determined during ground tests in Thermal Vacuum Test #3, the instrument is performing more efficiently in all filters. For the UVIS channel, we measure efficiencies that are higher than ground tests by 15-20% at central wavelengths and 5-10% at the blue and red ends of the UVIS spectral range. For the IR channel, the instrument throughput is 10-15% higher in all filters. New photometric zero points have been calculated, and updates to the exposure time calculator have been implemented.

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