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Euclid: Estimation of the Impact of Correlated Readout Noise for Flux Measurements with the Euclid NISP Instrument

Jiménez Muñoz, A. and Macías-Pérez, J. and Secroun, A. and Gillard, W. and Kubik, B. and Auricchio, N. and Balestra, A. and Bodendorf, C. and Bonino, D. and Branchini, E. and Brescia, M. and Brinchmann, J. and Capobianco, V. and Carbone, C. and Carretero, J. and Casas, R. and Castellano, M. and Cavuoti, S. and Cimatti, A. and Cledassou, R. and Congedo, G. and Conversi, L. and Copin, Y. and Corcione, L. and Costille, A. and Cropper, M. and Degaudenzi, H. and Douspis, M. and Dubath, F. and Dusini, S. and Ealet, A. and Franceschi, E. and Franzetti, P. and Fumana, M. and Garilli, B. and Gillis, B. and Giocoli, C. and Grazian, A. and Grupp, F. and Haugan, S. V. H. and Holmes, W. and Hormuth, F. and Jahnke, K. and Kermiche, S. and Kiessling, A. and Kilbinger, M. and Kümmel, M. and Kunz, M. and Kurki-Suonio, H. and Laureijs, R. and Ligori, S. and Lilje, P. B. and Lloro, I. and Maiorano, E. and Mansutti, O. and Marggraf, O. and Markovic, K. and Massey, R. and Medinaceli, E. and Mei, S. and Meneghetti, M. and Meylan, G. and Moscardini, L. and Niemi, S. M. and Padilla, C. and Paltani, S. and Pasian, F. and Pedersen, K. and Percival, W. J. and Pires, S. and Polenta, G. and Poncet, M. and Popa, L. and Pozzetti, L. and Raison, F. and Rebolo, R. and Roncarelli, M. and Rossetti, E. and Saglia, R. and Sauvage, M. and Scaramella, R. and Schneider, P. and Seidel, G. and Serrano, S. and Sirignano, C. and Sirri, G. and Tavagnacco, D. and Taylor, A. N. and Teplitz, H. I. and Tereno, I. and Toledo-Moreo, R. and Valenziano, L. and Vassallo, T. and Verdoes Kleijn, G. A. and Wang, Y. and Weller, J. and Wetzstein, M. and Zamorani, G. and Zoubian, J. (2021) Euclid: Estimation of the Impact of Correlated Readout Noise for Flux Measurements with the Euclid NISP Instrument. Publications of the Astronomical Society of the Pacific, 133 (1027). Art. No. 094502. ISSN 0004-6280. doi:10.1088/1538-3873/ac21de.

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The Euclid satellite, to be launched by ESA in 2022, will be a major instrument for cosmology for the next decades. Euclid is composed of two instruments: the Visible instrument and the Near Infrared Spectrometer and Photometer (NISP). In this work, we estimate the implications of correlated readout noise in the NISP detectors for the final in-flight flux measurements. Considering the multiple accumulated readout mode, for which the UTR (Up The Ramp) exposure frames are averaged in groups, we derive an analytical expression for the noise covariance matrix between groups in the presence of correlated noise. We also characterize the correlated readout noise properties in the NISP engineering-grade detectors using long dark integrations. For this purpose, we assume a (1/f)^α-like noise model and fit the model parameters to the data, obtaining typical values of σ = 19.7^(+1.1)_(−0.8) e⁻ Hz^(−0.5), f_(knee) = (5.2^(+1.8)_(−1.3))×10⁻³ Hz and α = 1.24^(+0.26)_(−0.21). Furthermore, via realistic simulations and using a maximum likelihood flux estimator we derive the bias between the input flux and the recovered one. We find that using our analytical expression for the covariance matrix of the correlated readout noise we diminish this bias by up to a factor of four with respect to the white noise approximation for the covariance matrix. Finally, we conclude that the final bias on the in-flight NISP flux measurements should still be negligible even in the white readout noise approximation, which is taken as a baseline for the Euclid on-board processing to estimate the on-sky flux.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Macías-Pérez, J.0000-0002-5385-2763
Meneghetti, M.0000-0003-1225-7084
Teplitz, H. I.0000-0002-7064-5424
Wang, Y.0000-0002-4749-2984
Additional Information:© 2021. The Astronomical Society of the Pacific. Received 2021 May 3; accepted 2021 August 23; published 2021 September 17. The Euclid Consortium acknowledges the European Space Agency and a number of agencies and institutes that have supported the development of Euclid, in particular, the Academy of Finland, the Agenzia Spaziale Italiana, the Belgian Science Policy, the Canadian Euclid Consortium, the Centre National dEtudes Spatiales, the Deutsches Zentrum für Luft- und Raumfahrt, the Danish Space Research Institute, the Fundação para a Ciência e a Tecnologia, the Ministerio de Economia y Competitividad, the National Aeronautics and Space Administration, the Netherlandse Onderzoekschool Voor Astronomie, the Norwegian Space Agency, the Romanian Space Agency, the State Secretariat for Education, Research and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space Agency. A complete and detailed list is available on the Euclid website (
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Space Agency (ESA)UNSPECIFIED
Academy of FinlandUNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
Canadian Euclid ConsortiumUNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Danish Space Research InstituteUNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)UNSPECIFIED
Ministerio de Economia y Competitividad (MINECO)UNSPECIFIED
Nederlandse Onderzoekschool Voor Astronomie (NOVA)UNSPECIFIED
Norwegian Space AgencyUNSPECIFIED
Romanian Space AgencyUNSPECIFIED
State Secretariat for Education, Research and Innovation (SERI)UNSPECIFIED
Swiss Space Office (SSO)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Subject Keywords:Infrared photometry; Infrared Astronomical Satellite
Issue or Number:1027
Classification Code:Unified Astronomy Thesaurus concepts: Infrared photometry (792); Infrared Astronomical Satellite (785)
Record Number:CaltechAUTHORS:20211001-213811722
Persistent URL:
Official Citation:A. Jiménez Muñoz et al 2021 PASP 133 094502
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111162
Deposited By: Tony Diaz
Deposited On:04 Oct 2021 17:44
Last Modified:04 Oct 2021 17:44

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