A1 Journal article (refereed)
Euclid preparation : XIX. Impact of magnification on photometric galaxy clustering (2022)
Euclid Collaboration. (2022). Euclid preparation : XIX. Impact of magnification on photometric galaxy clustering. Astronomy and Astrophysics, 662, Article A93. https://doi.org/10.1051/0004-6361/202142419
JYU authors or editors
Publication details
All authors or editors: Euclid Collaboration
Journal or series: Astronomy and Astrophysics
ISSN: 0004-6361
eISSN: 1432-0746
Publication year: 2022
Volume: 662
Article number: A93
Publisher: EDP Sciences
Publication country: France
Publication language: English
DOI: https://doi.org/10.1051/0004-6361/202142419
Publication open access: Not open
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/82498
Publication is parallel published: https://arxiv.org/abs/2110.05435
Abstract
Methods. We follow the prescriptions of the official Euclid Fisher matrix forecast for the photometric galaxy clustering analysis and the combination of photometric clustering and cosmic shear. The slope of the luminosity function (local count slope), which regulates the amplitude of the lensing magnification, and the galaxy bias have been estimated from the Euclid Flagship simulation.
Results. We find that magnification significantly affects both the best-fit estimation of cosmological parameters and the constraints in the galaxy clustering analysis of the photometric sample. In particular, including magnification in the analysis reduces the 1σ errors on Ωm, 0, w0, wa at the level of 20–35%, depending on how well we will be able to independently measure the local count slope. In addition, we find that neglecting magnification in the clustering analysis leads to shifts of up to 1.6σ in the best-fit parameters. In the joint analysis of galaxy clustering, cosmic shear, and galaxy–galaxy lensing, magnification does not improve precision, but it leads to an up to 6σ bias if neglected. Therefore, for all models considered in this work, magnification has to be included in the analysis of galaxy clustering and its cross-correlation with the shear signal (3 × 2pt analysis) for an accurate parameter estimation.
Keywords: cosmology; galaxy clusters; photometry
Free keywords: large-scale structure of Universe; cosmological parameters; cosmology: theory
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2022
JUFO rating: 2