WFC3 SMOV Proposal 11432: UVIS Internal Flats

Details WFC3 SMOV Proposal 11432: UVIS Internal Flats WFC3 SMOV Proposal 11432: UVIS Internal Flats

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010wfc..rept....3r&link_type=abstract

WFC3 Instrument Science Report 2010-03, 29 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3

Scientific paper

This report summarizes the behavior of the WFC3 calibration system for the UVIS chan- nel using data taken during SMOV. The results are compared to those obtained during the thermal-vacuum test 3 in 2008. The tungsten lamp shows a ˜10% higher relative flux rate compared to TV3, its output dropping at most a percent in most filters over ˜45 days. Ratios of the on-orbit to ground flats shows that the flats are stable with no obvious new features, though a small percentage of the droplets appear to have small subpixel shifts. The deuterium lamp shows a 3-8% drop in the measured count-rates over the duration of SMOV. The deuterium ratios on-orbit to ground flatfields show small scale variations of a ˜2% over the image attributed to contamination of the deuterium lamp surface. These features will limit the usefulness of the deuterium flats in generating difference flats for the calibration pipeline.

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