Bright source limits of JWST's Mid-Infrared Instrument (MIRI) are predicted by a saturation model that uses measurements obtained during ground testing.
Parent page: MIRI Predicted Performance
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).
Tables 1 and 2, and Figure 1 show bright source limits assuming a five 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
limit in F560W
limit in F2550W
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