Euclid preparation. XVIII. The NISP photometric system
Abstract
Euclid will be the first space mission to survey most of the extragalactic sky in the 0.95-2.02 m range, to a 5 point-source median depth of 24.4 AB mag. This unique photometric data set will find wide use beyond Euclid's core science. In this paper, we present accurate computations of the Euclid Y_E, J_E and H_E passbands used by the Near-Infrared Spectrometer and Photometer (NISP), and the associated photometric system. We pay particular attention to passband variations in the field of view, accounting among others for spatially variable filter transmission, and variations of the angle of incidence on the filter substrate using optical ray tracing. The response curves' cut-on and cut-off wavelengths - and their variation in the field of view - are determined with 0.8 nm accuracy, essential for the photometric redshift accuracy required by Euclid. After computing the photometric zeropoints in the AB mag system, we present linear transformations from and to common ground-based near-infrared photometric systems, for normal stars, red and brown dwarfs, and galaxies separately. A Python tool to compute accurate magnitudes for arbitrary passbands and spectral energy distributions is provided. We discuss various factors from space weathering to material outgassing that may slowly alter Euclid's spectral response. At the absolute flux scale, the Euclid in-flight calibration program connects the NISP photometric system to Hubble Space Telescope spectrophotometric white dwarf standards; at the relative flux scale, the chromatic evolution of the response is tracked at the milli-mag level. In this way, we establish an accurate photometric system that is fully controlled throughout Euclid's lifetime.
Cite
@article{arxiv.2203.01650,
title = {Euclid preparation. XVIII. The NISP photometric system},
author = {Euclid Collaboration and M. Schirmer and K. Jahnke and G. Seidel and H. Aussel and C. Bodendorf and F. Grupp and F. Hormuth and S. Wachter and P. N. Appleton and R. Barbier and J. Brinchmann and J. M. Carrasco and F. J. Castander and J. Coupon and F. De Paolis and A. Franco and K. Ganga and P. Hudelot and E. Jullo and A. Lancon and A. A. Nucita and S. Paltani and G. Smadja and L. M. G. Venancio and F. Strafella and M. Weiler and A. Amara and T. Auphan and N. Auricchio and A. Balestra and R. Bender and D. Bonino and E. Branchini and M. Brescia and V. Capobianco and C. Carbone and J. Carretero and R. Casas and M. Castellano and S. Cavuoti and A. Cimatti and R. Cledassou and G. Congedo and C. J. Conselice and L. Conversi and Y. Copin and L. Corcione and A. Costille and F. Courbin and A. Da Silva and H. Degaudenzi and M. Douspis and F. Dubath and X. Dupac and S. Dusini and A. Ealet and S. Farrens and S. Ferriol and P. Fosalba and M. Frailis and E. Franceschi and P. Franzetti and M. Fumana and B. Garilli and W. Gillard and B. Gillis and C. Giocoli and A. Grazian and L. Guzzo and S. V. H. Haugan and H. Hoekstra and W. Holmes and A. Hornstrup and S. Kermiche and A. Kiessling and M. Kilbinger and T. Kitching and R. Kohley and M. Kümmel and M. Kunz and H. Kurki-Suonio and R. Laureijs and S. Ligori and P. B. Lilje and I. Lloro and T. Maciaszek and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and F. Marulli and R. Massey and S. Maurogordato and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and E. Munari and R. Nakajima and R. C. Nichol and S. M. Niemi and C. Padilla and F. Pasian and K. Pedersen and W. J. Percival and V. Pettorino and S. Pires and M. Poncet and L. Popa and L. Pozzetti and E. Prieto and F. Raison and J. Rhodes and H. -W. Rix and M. Roncarelli and E. Rossetti and R. Saglia and B. Sartoris and R. Scaramella and P. Schneider and A. Secroun and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and P. Tallada-Crespí and A. N. Taylor and H. I. Teplitz and I. Tereno and R. Toledo-Moreo and F. Torradeflot and M. Trifoglio and E. A. Valentijn and L. Valenziano and Y. Wang and J. Weller and G. Zamorani and J. Zoubian and S. Andreon and S. Bardelli and A. Boucaud and S. Camera and R. Farinelli and J. Graciá-Carpio and D. Maino and E. Medinaceli and S. Mei and N. Morisset and G. Polenta and A. Renzi and E. Romelli and M. Tenti and T. Vassallo and A. Zacchei and E. Zucca and C. Baccigalupi and A. Balaguera-Antolínez and A. Biviano and A. Blanchard and S. Borgani and E. Bozzo and C. Burigana and R. Cabanac and A. Cappi and C. S. Carvalho and S. Casas and G. Castignani and C. Colodro-Conde and A. R. Cooray and H. M. Courtois and M. Crocce and J. -G. Cuby and S. Davini and S. de la Torre and D. Di Ferdinando and J. A. Escartin and M. Farina and P. G. Ferreira and F. Finelli and S. Fotopoulou and S. Galeotta and J. Garcia-Bellido and E. Gaztanaga and K. George and G. Gozaliasl and I. M. Hook and S. Ilić and V. Kansal and A. Kashlinsky and E. Keihanen and C. C. Kirkpatrick and V. Lindholm and G. Mainetti and R. Maoli and M. Martinelli and N. Martinet and M. Maturi and N. Mauri and H. J. McCracken and R. B. Metcalf and P. Monaco and G. Morgante and J. Nightingale and L. Patrizii and A. Peel and V. Popa and C. Porciani and D. Potter and P. Reimberg and G. Riccio and A. G. Sánchez and D. Sapone and V. Scottez and E. Sefusatti and R. Teyssier and I. Tutusaus and C. Valieri and J. Valiviita and M. Viel and H. Hildebrandt},
journal= {arXiv preprint arXiv:2203.01650},
year = {2022}
}
Comments
33 pages, 25 figures, accepted for publication in A&A