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Euclid preparation LXXVII. The NISP spectroscopy channel: Ground performance and calibration

Lookup NU author(s): James NightingaleORCiD

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Abstract

ESA’s Euclid cosmology mission relies on the very sensitive and accurately calibrated spectroscopy channel of the Near-Infrared Spectrometer and Photometer (NISP). With three operational grisms in two wavelength intervals, NISP provides diffraction-limited slitless spectroscopy over a field of 0.57 deg2. A blue grism, BGE, covers the wavelength range 926–1366 nm at a spectral resolution (ℛ) of 440–900 for a 0.″5 diameter source with a dispersion of 1.24 nm px−1. Two red grisms, RGE, span 1206 to 1892 nm at ℛ = 550–740 and a dispersion of 1.37 nm px−1. We describe the construction of the grisms as well as the ground testing of the flight model of the NISP instrument, where these properties were established.

Publication metadata

Author(s): Euclid Collaboration

Publication type: Article

Publication status: Published

Journal: Astronomy and Astrophysics

Year: 2026

Volume: 707

Online publication date: 17/03/2026

Acceptance date: 15/09/2025

Date deposited: 08/04/2026

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746

Publisher: EDP Sciences

URL: https://doi.org/10.1051/0004-6361/202555859

DOI: 10.1051/0004-6361/202555859

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