The Photometric Performance and Calibration of WFC3

Details The Photometric Performance and Calibration of WFC3 The Photometric Performance and Calibration of WFC3

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..20k&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Physics

Scientific paper

We analyze multiple observations of five bright HST spectrophotometric standard stars obtained with WFC3/UVIS and WFC3/IR in order to establish the temporal stability of the instrument over its first year of science operations and its photometric sensitivity. Observations of the five stars, GD 153, G191B2B, GD 71, GRW+70d5824, and P330E were obtained at multiple dither positions at each epoch in all filters. The cadence of the observations was once per week shortly after the instrument was installed in Hubble in the summer of 2009 (i.e., during SMOV) to once ever few months by the end of the first year. Analysis of the high signalto- noise photometry in wide and medium-bands indicates that the instrument is photometrically stable, with measured variations that are <0.5%. As calibrated after SMOV, the absolute throughput of the instrument is substantially higher than predictions based on Thermal Vacuum 3 (TV3) tests. Preliminary photometric zero points have been calculated in UVIS and IR filters factoring in the measured on-orbit throughput, however this analysis still uses the WFC3 ground flat fields. A pending update will provide more accurate zero points based on the first on-orbit flat fields for WFC3 which have just been released.

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