The JWST Near Infrared Spectrograph (NIRSpec) has four observing modes for near-infrared multi-object, integral field unit, fixed slit, and bright object time-series spectroscopy, from 0.6–5.3 μm.
Overview of NIRSpec observing modes
- Multi-object spectroscopy obtains simultaneous spectroscopy of multiple science targets within a 3.6' × 3.4' field of view using the micro-shutter assembly (MSA).
- IFU spectroscopy uses the integral field unit to provide spatially resolved spectroscopy over a 3" × 3" square region.
- Fixed slits spectroscopy provides five fixed slits for obtaining high sensitivity single object spectroscopy.
- Bright object time-series spectroscopy uses a 1.6" × 1.6" fixed slit aperture for observations of bright sources that require stable, high throughput time-resolved spectroscopy.