The bright source limits of JWST's Mid-Infrared Instrument (MIRI) are predicted by a saturation model that uses measurements obtained during ground testing.
The performance of MIRI has been measured directly at both the component and system level using the fully assembled MIRI flight model in a flight-like radiative environment with a well characterized radiometric source (Glasse et al. 2015). Results of these JWST throughput measurements have been integrated into a sensitivity model, which includes the following components: (1) background, (2) photon conversion efficiency (PCD), (3) encircled energy, and (4) detector performance (Pontoppidan 2016).
The tables and figures below show bright source limits assuming a 5-group integration. The values shown represent the fluxes at which the detector reaches 70% of the pixels' full-well capacity.
Table 1. MIRI imager bright source limits (for ngroups=5)
|Filter||Bright source limit (mJy) |
|Bright source limit (mJy) |
64 × 64 subarray
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