NGST Instruments
NIRSpec at a Glance:
This figure shows a Computer Aided Design layout of the instrument. The instrument measures 190 cm across and weighs close to 200 kg.
NIRSpec Features:
- All Reflective Optics
- 3.4ʼ x 3.6ʼ FOV (9 arcmin2 for MOS)
- 0.2” mas nominal slit width
- 3 slit selection devices:
- Micro-Shutter Array
- Micro-Shutter Array
- 3” x 3” Integral Field Unit
- 3 spectral resolutions:
- R=100 (0.7 - 5.0 µm - single prism)
- R=1000 (1.0 - 5.0 µm - 3 gratings)
- R=2700 (1.0 - 5.0 µm - 3 gratings)
- 2 x 2k x 2k HgCdTe arrays
Schematic layout of the NIRSpec slit mask, with overlaid the detector array projected to the same angular scale.
Sensitivity: The NIRSpec limiting sensitivity in 10,000 seconds for point source
continuum at 3 µm for R=100 and at S/N=10 is AB=26.2. For the flux limit at 2m in 100,000 seconds is 5.2x10-19 erg cm-2s-1.
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