HST/WFC3: Improvements to the UVIS Dark Calibration
Abstract
The Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS detector, comprised of two e2v CCDs, exhibits an inherent dark current (in the absence of any illumination) presently measured at ~7 e-/hr and increasing at ~1 e-/hr/yr. Additionally, detector degradation due to on-orbit radiation damage generates a continuously increasing though small population of hot pixels (dark current exceeding 54 e-/hr, currently ~4% of each chip). We present the results of the WFC3/UVIS dark calibration, which provides calibration files used as a correction for these detector characteristics. We also discuss the impacts that Charge Transfer Efficiency (CTE) losses and detector post-flashing have on the hot pixel population, as well as various improvements to the calibration procedure that were introduced in the CALWF3 v3.3 pipeline.
- Publication:
-
American Astronomical Society Meeting Abstracts #228
- Pub Date:
- June 2016
- Bibcode:
- 2016AAS...22821604B