<i>Euclid</i> preparation

L ENS MC is a weak lensing shear measurement method developed for Euclid and Stage-IV surveys. It is based on forward modelling in order to deal with convolution by a point spread function (PSF) with comparable size to many galaxies, sampling the posterior distribution of galaxy parameters via Markov chain Monte Carlo, and marginalisation over nuisance parameters for each of the 1.5 billion galaxies observed by Euclid . We quantified the scientific performance through high-fidelity images based on the Euclid Flagship simulations and emulation of the Euclid VIS images, realistic clustering with a mean surface number density of 250 arcmin −2 ( I E &lt; 29.5) for galaxies, and 6 arcmin −2 ( I E &lt; 26) for stars, and a diffraction-limited chromatic PSF with a full width at half maximum of 0′.′2 and spatial variation across the field of view. L ENS MC measured objects with a density of 90 arcmin −2 ( I E &lt; 26.5) in 4500 deg 2 . The total shear bias was broken down into measurement (our main focus here) and selection effects (which will be addressed in future work). We found measurement multiplicative and additive biases of m 1 = (−3.6 ± 0.2) × 10 −3 , m 2 = (−4.3 ± 0.2) × 10 −3 , c 1 = (−1.78 ± 0.03) × 10− 4 , and c 2 = (0.09 ± 0.03) × 10 −4 ; a large detection bias with a multiplicative component of 1.2 × 10 −2 and an additive component of −3 × 10 −4 ; and a measurement PSF leakage of α 1 = (−9 ± 3) × 10 −4 and α 2 = (2 ± 3) × 10 −4 . When model bias is suppressed, the obtained measurement biases are close to Euclid requirement and largely dominated by undetected faint galaxies (−5 × 10 −3 ). Although significant, model bias will be straightforward to calibrate given its weak sensitivity on galaxy morphology parameters. L ENS MC is publicly available at gitlab.com/gcongedo/LensMC.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-10-14
DOI
https://doi.org/10.1051/0004-6361/202450617
Citations
9
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
2.98

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article

Euclid preparation

A Hall, G. Seidel, Will J. Percival, R. P. Saglia et al.
9 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
2.98
article

Euclid preparation

A Hall, G. Seidel, Will J. Percival, R. P. Saglia, P. Tallada-Crespí, S Matthew, A. Cimatti, G. Riccio, C. Sirignano, M. Brescia, N. Martinet, I. Ferrero, W. Holmes, M. Maturi, M. Kunz, A. Boucaud, C. Baccigalupi, J. Carretero, F. Marulli, J. García-Bellido, S. Borgani, N. Mauri, O. Marggraf, V. F. Cardone, J. F. Macías–Pérez, M. Migliaccio, Y. Copin, J. Rhodes, A. Kiessling, A. Troja, Joachim Stadel, A. Renzi, F. Torradeflot, J. Zoubian, A. Díaz‐Sánchez, G. Sirri, E Maiorano, G. Gozaliasl, M. Tewes, S. Mei, S. Bardelli, G. Mainetti, G. Desprez, P. Reimberg, Francisco Javier Castander, E. Munari, E. Sefusatti, M. Martinelli, P. Fosalba, M. Magliocchetti, J Steinwagner, S. Nadathur, V. Capobianco, L. Moscardini, T. Schrabback, L. Gabarra, S. Farrens, C. J. A. P. Martins, S. Maurogordato, S. V. H. Haugan, D. Vergani, R. Massey, T. Vassallo, S Davini, C.J. Conselice, D. Tavagnacco, R. Toledo-Moreo, S Bruton, M. Moresco, N. J. G. Cross, V. Scottez, Mark Holliman, E. Zucca, D. Sapone, Shahab Joudaki, T. Castro, M. Poncet, M. Meneghetti, H. J. McCracken, D. Bonino, J.W Nightingale, C. Colodro-Conde, J. J. E. Kajava, S. Ilić, A. Veropalumbo, L. Valenziano, H. Dole, H. Hildebrandt, M Ballardini, S. Ferriol, E. Romelli, C. Burigana, A. M. Di Giorgio, A. Biviano, H. Degaudenzi, O. Mansutti, Matteo Viel, B. Morin, V. Allevato, T. Castro, J. Väliviita, D. Karagiannis, S. Escoffier, J Brinchmann, B. Gillis, C. Giocoli, F. Dubath, M. Kümmel, S Casas, R. B. Metcalf, A. Hornstrup, R. Bender, E. Medinaceli, E. Bozzo, A. Amara, M. Pöntinen, S. Di Domizio, A. Secroun, M. Farina, F. Pasian, V. Kansal, S Anselmi, J. Weller, S. Ligori, M. Castellano, T. Kitching, F. Grupp, F. Giacomini, S. Galeotta, F. Raison, E. Franceschi, E. A. Valentijn, P. Monaco, A. Cappi, J.A Schewtschenko, K Jahnke, Marco Baldi, L. Patrizii, ENRIQUE GAZTAÑAGA, Konrad H. Kuijken, Ariel G. Sánchez, A. A. Nucita, G Cañas-Herrera, K. Markovič, R. Cabanac, S. Camera, Z. Sakr, L. Legrand, Romain Teyssier, Asantha Cooray, K. C. Chambers, M. Kilbinger, F. Finelli⋆, J. Dinis, V. Lindholm, R. Rébolo, Austin Peel, L. Conversi, P.-F Rocci, M. Sereno, E. Keihänen, B. Sartoris, G. Castignani, S. Cavuoti, M. Bolzonella, N. Auricchio, M. Frailis, A. Spurio Mancini, P. Šimon, C. Carbone, S. Kermiche, Sune Toft, P. B. Lilje, E Merlin, S. Serrano, V. Popa, A Pezzotta, B. Garilli, M. Cropper, Aurel Schneider, D. Potter, D. Guinet, E. Branchini, C. Porciani, Alejandro S. Borlaff, L. Pozzetti, Y. Akrami, G. De Lucia, H. M. Courtois, S Andreon, Yun Wang, S. Tosi, A. Da Silva, L. Stančo, L. Maurin, L. Miller, A. Jiménez Muñoz, I. Lloro, I. Tutusaus, N. Aghanim, S.-M. Niemi, E. Rossetti, C. C. Kirkpatrick, F. Hormuth, V. Pettorino, C. Bodendorf, J. Coupon, M. Tenti, G. Zamorani, L. Popa, P. Schneider, I. Tereno, G. Morgante, G. Meylan, M. Melchior, K. Pedersen, F. Courbin, H. Kurki‐Suonio, M. Tucci, P. Hudelot, M. Wiesmann, G. Maggio, C. Neissner, C. Padilla, S. Pires, N. Welikala, J.A. Escartin Vigo, B. Kubik, J Graciá-Carpio, D. Di Ferdinando, M. D. Seiffert, S. Paltani, A. Grazian, G. Polenta, G. Testera, A. N. Taylor, C Valieri, C. A. J. Duncan, G. Congedo, X. Dupac
article en
9 citations

Abstract

L ENS MC is a weak lensing shear measurement method developed for Euclid and Stage-IV surveys. It is based on forward modelling in order to deal with convolution by a point spread function (PSF) with comparable size to many galaxies, sampling the posterior distribution of galaxy parameters via Markov chain Monte Carlo, and marginalisation over nuisance parameters for each of the 1.5 billion galaxies observed by Euclid . We quantified the scientific performance through high-fidelity images based on the Euclid Flagship simulations and emulation of the Euclid VIS images, realistic clustering with a mean surface number density of 250 arcmin −2 ( I E &lt; 29.5) for galaxies, and 6 arcmin −2 ( I E &lt; 26) for stars, and a diffraction-limited chromatic PSF with a full width at half maximum of 0′.′2 and spatial variation across the field of view. L ENS MC measured objects with a density of 90 arcmin −2 ( I E &lt; 26.5) in 4500 deg 2 . The total shear bias was broken down into measurement (our main focus here) and selection effects (which will be addressed in future work). We found measurement multiplicative and additive biases of m 1 = (−3.6 ± 0.2) × 10 −3 , m 2 = (−4.3 ± 0.2) × 10 −3 , c 1 = (−1.78 ± 0.03) × 10− 4 , and c 2 = (0.09 ± 0.03) × 10 −4 ; a large detection bias with a multiplicative component of 1.2 × 10 −2 and an additive component of −3 × 10 −4 ; and a measurement PSF leakage of α 1 = (−9 ± 3) × 10 −4 and α 2 = (2 ± 3) × 10 −4 . When model bias is suppressed, the obtained measurement biases are close to Euclid requirement and largely dominated by undetected faint galaxies (−5 × 10 −3 ). Although significant, model bias will be straightforward to calibrate given its weak sensitivity on galaxy morphology parameters. L ENS MC is publicly available at gitlab.com/gcongedo/LensMC.

Astronomy and AstrophysicsVol. 691
Université Claude Bernard Lyon 1 (FR), Institut polytechnique de Grenoble (FR), University of Geneva (CH), University of Rome Tor Vergata (IT), Leiden University (NL), California Institute of Technology (US), University of Copenhagen (DK), Ames Research Center (US), Centre National de la Recherche Scientifique (FR), University of Minnesota (US), Institute of Space Sciences (ES), University of Hawaii System (US), Jet Propulsion Laboratory (US), University of Helsinki (FI), Université Toulouse III - Paul Sabatier (FR), Consejo Superior de Investigaciones Científicas (ES), University of Bonn (DE), Scuola Internazionale Superiore di Studi Avanzati (IT), University of Padua (IT), University of Lisbon (PT), University of Trieste (IT), University of Salento (IT), University of Waterloo (CA), University of Turku (FI), Universidad de La Laguna (ES), University of Groningen (NL), Université Fédérale de Toulouse Midi-Pyrénées (FR), Universidade do Porto (PT), Perimeter Institute (CA), Saint Joseph University (LB), University of Oslo (NO), Institute for High Energy Physics (ES), University of Milan (IT), Durham University (GB), Universität Innsbruck (AT), Princeton University (US), University of Ferrara (IT), Université Côte d'Azur (FR), University of Zurich (CH), University of California, Irvine (US), Aarhus University (DK), Université Paris Cité (FR), Aix-Marseille Université (FR), Heidelberg University (DE), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris Sciences et Lettres (FR), Université Paris-Saclay (FR), Centre National d'Études Spatiales (FR), W.M. Keck Observatory (US), Helsinki Institute of Physics (FI), Astronomical Observatory of Rome (IT), Agenzia Spaziale Italiana (IT), Trieste Astronomical Observatory (IT), Institut d'Astrophysique de Paris (FR), Astronomical Observatory of Capodimonte (IT), Laboratoire AstroParticule et Cosmologie (FR), Brera Astronomical Observatory (IT), University of Manchester (GB), FHNW University of Applied Sciences and Arts Northwestern Switzerland (CH), Institute for High Performance Computing and Networking (IT), Universidad Politécnica de Cartagena (ES), Sorbonne Université (FR), University of Oxford (GB), Astrophysique, Instrumentation et Modélisation (FR), Janssen (France) (FR), Laboratoire Univers et Théories (FR), Institute of Astrophysics and Space Sciences (PT), ARC Centre of Excellence for Dark Matter Particle Physics (AU), Max Planck Institute for Extraterrestrial Physics (DE), Institut d'Estudis Espacials de Catalunya (ES), European Space Astronomy Centre (ES), Centre de physique des particules de Marseille (FR), Kavli Institute for Particle Astrophysics and Cosmology (US), Istituto Nazionale di Fisica Nucleare, Sezione di Lecce (IT), Laboratoire d’Astrophysique de Marseille (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT), Institute for Space Astrophysics and Planetology (IT), Institut d'Astrophysique Spatiale (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Osservatorio Astrofisico di Torino (IT), Royal Observatory (GB), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Centro de Astrofísica da Universidade do Porto (PT), Max Planck Institute for Astronomy (DE), Bay Area Environmental Research Institute (US), Lagrange Laboratory (FR), Istituto di Radioastronomia di Bologna (IT), Château Gombert (FR), Université Bourgogne Franche-Comté (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), Observatoire de la Côte d’Azur (FR), CEA Paris-Saclay (FR), Instituto de Astrofísica de Canarias (ES), Institut National de Physique Nucléaire et de Physique des Particules (FR), von Hoerner & Sulger (Germany) (DE), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Laboratoire de Physique Subatomique et de Cosmologie (FR), Institute of Space Science - INFLPR Subsidiary (RO), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Port d'Informació Científica (ES), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Institute for Fundamental Physics of the Universe (IT), Institute of Nuclear Physics of Lyon (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), Osservatorio Astronomico di Padova (IT), European Space Research Institute (IT), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), Institut de Recherche en Astrophysique et Planétologie (FR), Infrared Processing and Analysis Center (US), Osservatorio di Astrofisica e Scienza dello Spazio, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Institut de Physique des 2 Infinis de Lyon (FR), European Space Research and Technology Centre (NL), University College London (GB), École Polytechnique Fédérale de Lausanne (CH), University of Turin (IT), Swinburne University of Technology (AU), Case Western Reserve University (US), University of Portsmouth (GB), Universidad Autónoma de Madrid (ES), Saint Mary's University (CA), University of Chile (CL), Heidelberg Institute for Theoretical Studies (DE), Ludwig-Maximilians-Universität München (DE), University of Genoa (IT), Newcastle University (GB), Sapienza University of Rome (IT), University of the Western Cape (ZA), National Institute for Astrophysics (IT), RWTH Aachen University (DE), Université Grenoble Alpes (FR), Ruhr University Bochum (DE), Netherlands Institute for Radio Astronomy (NL), University of Bologna (IT), Universitat Politècnica de Catalunya (ES), Technical University of Denmark (DK), Stanford University (US), University of Edinburgh (GB), Aalto University (FI)
National Aeronautics and Space Administration, Ministerio de Ciencia, Innovación y Universidades, European Space Agency, Imperial College London, University of Oxford, Magyar Tudományos Akadémia, Agenzia Spaziale Italiana, Österreichische Forschungsförderungsgesellschaft, National Astronomical Observatory of Japan, Agenția Spațială Română, Norsk Romsenter, Fundação para a Ciência e a Tecnologia
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Galaxies: Formation, Evolution, Phenomena
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