An accurate measurement of the spectral resolution of the JWST Near Infrared Spectrograph

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Volume 702 (October 2025)

A&A, 702 (2025) L12

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Table 1.

Best-fit values for parameters in the expression of σ_inst′(λ) in Eq. (2).

Disperser	Filter	λ_piv (Å)	σ′_piv (km s⁻¹)	α
FS mode
G140M	F070LP	10111.02	124.84 ± 2.37	0.676 ± 0.147
G140H	F070LP	10111.02	50.44 ± 0.44	0.500 ± 0.083
G140M	F100LP	13347.24	94.99 ± 5.10	0.899 ± 0.054
G140H	F100LP	13347.24	40.63 ± 2.25	0.703 ± 0.082
G235M	F170LP	22765.89	101.07 ± 1.12	0.478 ± 0.018
G235H	F170LP	22765.89	40.20 ± 0.12	0.479 ± 0.005
G395M	F290LP	38474.54	102.95 ± 0.52	0.220 ± 0.018
G395H	F290LP	38474.54	40.48 ± 1.04	0.340 ± 0.061
IFS mode
G140M	F100LP	13539.59	117.01 ± 2.25	0.668 ± 0.035
G140H	F100LP	13539.59	46.36 ± 1.05	0.699 ± 0.036
G235M	F170LP	22938.52	112.74 ± 0.59	0.488 ± 0.008
G235H	F170LP	22938.52	42.75 ± 0.28	0.398 ± 0.010
G395M	F290LP	38891.71	105.74 ± 0.56	0.251 ± 0.014
G395H	F290LP	38891.71	41.98 ± 0.70	0.239 ± 0.026

Notes. The value of σ_PN in Eq. (2) is measured in Sect. 3.2 to be σ_PN = 6.90 ± 0.49 km s⁻¹.

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