MIRI Bright Source Limits
Bright source limits of JWST's Mid-Infrared Instrument (MIRI) are derived from in-flight measurements.
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The values in the tables and plot below were obtained from ETC 4.0.
All modes
Figure 1. MIRI bright source limits for point sources (for Ngroups = 5)
MIRI bright source limits for point sources for all modes based on ETC 4.0. The plotted values represent the flux densities at which the signal will reach 70% of full well in Ngroups of 5. All calculations assume FULL frame, except the LRS slitless mode, which exclusively operated in the SLITLESSPRISM subarray. Spectroscopic values are calculated per spectral pixel.
Imager
Table 1.MIRI imager bright source limits (for Ngroups = 5)
Filter | Full Frame (mJy) | SUB64 subarray (mJy) |
---|---|---|
F560W | 3.95 | 128.85 |
F770W | 3.22 | 105.65 |
F1000W | 5.83 | 192.11 |
F1130W | 22.32 | 731.18 |
F1280W | 11.07 | 366.78 |
F1500W | 12.33 | 415.84 |
F1800W | 21.74 | 753.07 |
F2100W | 25.44 | 974.83 |
F2550W | 57.63 | 2686.02 |
Table 2.MIRI imager subarray bright source limits (for Ngroups = 5)
Subarray | Brightness limit in F560W (mJy) | Brightness limit in F2550W (mJy) |
---|---|---|
FULL | 3.95 | 57.63 |
BRIGHTSKY | 12.67 | 241.21 |
SUB256 | 36.61 | 745.05 |
SUB128 | 92.13 | 1913.37 |
SUB64 | 128.85 | 2686.02 |
References
Glasse, A., et al. 2015, PASP, 127, 686
The Mid-Infrared Instrument for the James Webb Space Telescope, IX: Predicted Sensitivity
Pontoppidan, K. 2016, Proc of SPIE, 9910, 16
Pandeia: a multi-mission exposure time calculator for JWST and WFIRST