Year: 2026
Type: article
Abstract: We compared the performance of the flat-sky approximation and Limber approximation for the clustering analysis of the photometric galaxy catalogue of Euclid. We studied a 6-bin configuration, representing the first data release (DR1), and a 13-bin configuration, representing the third and final data release (DR3). We find that the Limber approximation is sufficiently accurate for the analysis of the wide bins of DR1. Instead, the 13 bins of DR3 cannot be modelled accurately with the Limber approximation. Instead, the flat-sky approximation is accurate to below 5% in recovering the angular power spectra of galaxy number counts in both cases and can be used to simplify the computation of the full power spectrum in harmonic space for the data analysis of DR3.
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, Ministerio de Ciencia, Innovación y Universidades, European Space Agency, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Generalitat de Catalunya, Magyar Tudományos Akadémia, Agenzia Spaziale Italiana, National Astronomical Observatory of Japan, Ministero degli Affari Esteri e della Cooperazione Internazionale, Agenția Spațială Română, Norsk Romsenter, Institut de Física d'Altes Energies, Research Executive Agency, Fundação para a Ciência e a Tecnologia, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Agencia Estatal de Investigación
Awards: G1105844351, G1175115578, G120905174, G1272927172, G2001838499, G2064873908, G210041235, G2262748287, G24120701, G2469010403, G2601397997, G2648730778, G294895050, G2988934680, G3005324705, G300979063, G308504231, G34346518, G3480869486, G357246561, G3681454997, G3715634343, G4042783231, G4246495971, G425668148, G4368239921, G491712853, G5080475149, G5195188938, G5262952806, G529962013, G531036588, G5385376234, G5404395142, G5555131222, G593054264, G617610489, G624877701, G6513613686, G69051668, G7044659667, G7084143925, G737202499, G7425137858, VLSI-Systeme mit optischen Verbindungen - Vorstudie der technologischen Machbarkeit -, G7706171750, G7805626310, G7863371703, G787121397, G8186726090, G8345352404, G8497050386, G8684520763, G972786147
OpenAlex ID: W7128957255
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