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The sensitivity model for the JWST Mid-Infrared Instrument (MIRI) uses ground testing measurements and incorporated into a full sensitivity model that includes parameters such as background, photon conversion efficiency, encircled energy and detector performance.

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Introduction

The performance of JWST 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). The results of the 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, (4) and detector performance (Pontoppidan 2016).

 


Calculation

 

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Users should ultimately use the Exposure Time Calculator (ETC) for all sensitivity calculations.

 


Sensitivity values

 

Table 1. S/N=10 in 10^4 s for the MIRI imaging filters

FilterLow-background detection limit (μJy)
F560W0.18
F770W0.28
F1000W0.60
F1130W1.47
F1280W0.95
F1500W1.62
F1800W3.88
F2100W7.55
F2550W26.96

 

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Figure 1. Expected sensitivity for the various MIRI instrument modes

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MIRI Overview
MIRI Overview
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MIRI sensitivity plot for MRS (in colors), low-resolution spectrometer (LRS) (in black), and imager (in circles) configurations, corresponding to S/N=10, 1E4 seconds on-source integration time. Solid lines and dots correspond to continuum sensitivity for a spatially unresolved target (units of μJy), while dotted lines correspond to the sensitivity for the detection of an unresolved spectral line in a spatially unresolved target (units of 10–20 Watt m-2).

 


 

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Related links

JWST User Documentation Home
Mid-Infrared Instrument, MIRI
MIRI Overview
JWST Exposure Time Calculator
JWST ETC website

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References

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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 

JWST technical documents

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Last updated

Published January 4, 2017


 

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Published March 02, 2017


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