History of Observing/mirs_spectroscopy_20230101(No. 1)

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- 1 (2023-01-01 (Sun) 04:17:40)
- 2 (2023-01-01 (Sun) 04:23:11)

Available Modes†

Available spectroscopic modes are listed in the table below.

Name	Wavelength range (um)	Resolving power	Note
N	7.0-13.5	170
Q	16.5-26.0	110

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Saturation limit†

Saturation limits depend on wavelength as shown in the figures below, and the typical levels are summarized in the following table. In the water-vapor-absorbing bands, the saturation limits vary with PWV.

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Saturation limit of the KL band mode.	Saturation limit of the 2.7um band mode.	Saturation limit of the LM+ND2 band mode.

Name	Saturation limit
KL	7 Jy
2.7-um	20 Jy
LM+ND2	400 Jy

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Sensitivity†

1-sigma 1-sec sensitivity is shown in the figures below. Since the sensitivity is limited by readout noise (assumed 100e-/read), it improves with longer 1-frame exposure times. In water-vapor-absorbing bands, it also depends on PWV. The truncation on the right edge shows the saturated region with the corresponding exposure time. The LM-mode sensitivity is significantly worse due to the ND filters and the strong absorption of the diamond window.

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KL mode†

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KL-mode sensitivity at PWV=0.3 mm.	KL-mode sensitivity at PWV=0.7 mm.	KL-mode sensitivity at PWV=1.2 mm.

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2.7-um mode†

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2.7um-mode sensitivity at PWV=0.3 mm.	2.7umL-mode sensitivity at PWV=0.7 mm.	2.7um-mode sensitivity at PWV=1.2 mm.

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LM+ND2 mode†

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LM-mode (w/ ND2) sensitivity at PWV=0.3 mm.	LM-mode (w/ ND2) sensitivity at PWV=0.7 mm.	LM-mode (w/ ND2) sensitivity at PWV=1.2 mm.