Photometric Repeatability and Sensitivity Evolution of WFC3/IR
Abstract
We use spatial scanning observations of stars in the open cluster M35 to estimate the photometric repeatability of the Wide Field Camera 3 IR imaging mode and probe the time dependence of its sensitivity. With data taken using the WFC3 infrared detector and the F140W filter, we estimate the near-term 1-σ photometric repeatability to be 0.65 % and find a long-term sensitivity evolution at the rate of -0.024 ± 0.008 % per year. Our observations with the F098M filter do not suggest any significant loss of sensitivity over time but additional data are required to reach more robust conclusions. We also investigate various possible systematics affecting these analyses.
- Publication:
-
Space Telescope WFC Instrument Science Report
- Pub Date:
- May 2021
- Bibcode:
- 2021wfc..rept....5S
- Keywords:
-
- HST;
- Hubble Space Telescope;
- STScI;
- Space Telescope Science Institute;
- WFC3;
- Wide Field Camera 3