Euclid preparation: The NISP spectroscopy channel, on ground performance and calibration

2025/06/10 by Euclid Collaboration, Gillard, W., Maciaszek, T. +356
#FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM)

paper · doi:10.48550/arxiv.2506.08378

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 BG_E covers the wavelength range 926--1366 nm at a spectral resolution R=440--900 for a 0.5'' diameter source with a dispersion of 1.24 nm px^-1. Two red grisms RG_E 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.

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