Several JWST instruments have imaging capabilities, covering different fields of view and wavelengths.
MIRI, NIRCam, and NIRISS are the imaging instruments on JWST. The wavelength ranges and available modes of use are summarized in Table 1. The "main article" links above connect you to the details for each instrument. Note that NIRISS imaging is only offered as a parallel observing mode.
- the Imaging Options and Imaging Performance articles provide more detailed descriptions of these modes;
- an Imaging Roadmap article is available for planning imaging observations;
- if using imaging in coordinated parallel mode, see the Coordinated Parallels Roadmap.
Table 1. Summary of JWST's standard imaging capabilities
|Instrument||Wavelength range||Mode of use|
|NIRCam||0.6 μm < λ < 5 μm||Primary or parallel|
|MIRI||5.6 μm < λ < 25.5 μm||Primary or parallel|
|NIRISS||0.8 μm < λ < 5 μm||Parallel only|
NIRCam provides imaging in 2 wavelength ranges simultaneously over the same 9.7 arcmin² field of view (via a dichroic): 0.6–2.3 μm (0.031"/pix) and 2.4–5.0 μm (0.063"/pix). It uses 2 near-identical side-by-side modules, separated by a 44" gap. NIRCam's short wavelength channel also has small 4"–5" gaps between detectors.
MIRI offers imaging at a complementary wavelength range, from 5.6 to 25.5 μm over a 3.1 arcmin² field of view, and has a detector plate scale of 0.11"/pixel.
NIRISS offers 0.8–5.0 μm (0.065"/pix) imaging in a 4.84 arcmin² field of view and many of its filters are essentially identical counterparts to the NIRCam filters. Consequently, NIRCam and NIRISS can be used in parallel to increase the sky coverage at a particular wavelength. NIRISS imaging is not offered as a primary mode.
Figure 1 shows the relative positions of the imager fields of view within the JWST focal plane, which is useful to know when planning parallel observations.