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Status: Bibliographieeintrag

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Verfasst von:Bretonnière, Hubert [VerfasserIn]   i
 Jahnke, Knud [VerfasserIn]   i
 Seidel, Gregor [VerfasserIn]   i
 Maturi, Matteo [VerfasserIn]   i
 Sakr, Ziad [VerfasserIn]   i
Titel:Euclid preparation
Titelzusatz:XXVI. The euclid morphology challenge : towards structural parameters for billions of galaxies
Verf.angabe:Euclid collaboration: H. Bretonnière, K. Jahnke, G. Seidel, M. Maturi, Z. Sakr [und viele weitere]
E-Jahr:2023
Jahr:14 March 2023
Umfang:29 S.
Illustrationen:Illustrationen
Fussnoten:Gesehen am 09.10.2023
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2023
Band/Heft Quelle:671(2023) vom: März, Artikel-ID A102, Seite 1-29
ISSN Quelle:1432-0746
Abstract:The various Euclid imaging surveys will become a reference for studies of galaxy morphology by delivering imaging over an unprecedented area of 15 000 square degrees with high spatial resolution. In order to understand the capabilities of measuring morphologies from Euclid-detected galaxies and to help implement measurements in the pipeline of the Organisational Unit MER of the Euclid Science Ground Segment, we have conducted the Euclid Morphology Challenge, which we present in two papers. While the companion paper focusses on the analysis of photometry, this paper assesses the accuracy of the parametric galaxy morphology measurements in imaging predicted from within the Euclid Wide Survey. We evaluate the performance of five state-of-the-art surface-brightness-fitting codes, DeepLeGATo, Galapagos-2, Morfometryka, ProFit and SourceXtractor, on a sample of about 1.5 million simulated galaxies (350 000 above 5σ) resembling reduced observations with the Euclid VIS and NIR instruments. The simulations include analytic Sérsic profiles with one and two components, as well as more realistic galaxies generated with neural networks. We find that, despite some code-specific differences, all methods tend to achieve reliable structural measurements (< 10% scatter on ideal Sérsic simulations) down to an apparent magnitude of about IE = 23 in one component and IE = 21 in two components, which correspond to a signal-to-noise ratio of approximately 1 and 5, respectively. We also show that when tested on non-analytic profiles, the results are typically degraded by a factor of 3, driven by systematics. We conclude that the official Euclid Data Releases will deliver robust structural parameters for at least 400 million galaxies in the Euclid Wide Survey by the end of the mission. We find that a key factor for explaining the different behaviour of the codes at the faint end is the set of adopted priors for the various structural parameters.
DOI:doi:10.1051/0004-6361/202245042
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1051/0004-6361/202245042
 kostenfrei: Volltext: https://www.aanda.org/articles/aa/abs/2023/03/aa45042-22/aa45042-22.html
 DOI: https://doi.org/10.1051/0004-6361/202245042
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:186092638X
Verknüpfungen:→ Zeitschrift

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