期刊
ASTRONOMY & ASTROPHYSICS
卷 646, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202038831
关键词
cosmology: miscellaneous; gravitational lensing: weak; large-scale structure of Universe; methods: data analysis; methods: analytical; methods: statistical
资金
- European Research Council [647112]
- European Union [797794]
- Max Planck Society
- Alexander von Humboldt Foundation
- Federal Ministry of Education and Research
- Heisenberg grant of the Deutsche Forschungsgemeinschaft [Hi 1495/5-1]
- ERC Consolidator Grant [770935]
- Excellence Cluster ORIGINS - Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2094 - 390783311]
- Polish Ministry of Science and Higher Education [DIR/WK/2018/12]
- Polish National Science Center [2018/30/E/ST9/00698]
- Spanish Ministry of Science MINECO [PGC2018-102021, 639.043.512]
- Netherlands Organisation for Scientific Research (NWO)
- NSFC of China [11973070]
- Shanghai Committee of Science and Technology [19ZR1466600]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-7013]
- Science and Technology Facilities Council
- ESO Telescopes at the La Silla Paranal Observatory under programme [177.A-3016, 177.A-3017, 177.A-3018, 179.A-2004, 298.A-5015, A/2014B/008]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University, University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University
- Pennsylvania State University, University of Portsmouth
- Princeton University
- Spanish Participation Group, University of Tokyo, University of Utah
- Yale University
- STFC [ST/R000972/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [797794] Funding Source: Marie Curie Actions (MSCA)
This paper presents a methodology for joint cosmological analysis using weak gravitational lensing and galaxy clustering data from multiple surveys. The analysis incorporates cross-correlations, develops a hybrid model for non-linear scales, updates calibration procedures, and assesses signal contributions from astrophysical effects. The study also validates likelihood and goodness-of-fit statistics, introduces a new prior on the structure growth parameter, and proposes an alternative estimator for S-8 weak lensing constraints. Systematic effects are shown to bias S-8 by no more than 0.1 standard deviations, with expected improvements in S-8 constraints compared to previous analyses.
We present the methodology for a joint cosmological analysis of weak gravitational lensing from the fourth data release of the ESO Kilo-Degree Survey (KiDS-1000) and galaxy clustering from the partially overlapping Baryon Oscillation Spectroscopic Survey (BOSS) and the 2-degree Field Lensing Survey (2dFLenS). Cross-correlations between BOSS and 2dFLenS galaxy positions and source galaxy ellipticities have been incorporated into the analysis, necessitating the development of a hybrid model of non-linear scales that blends perturbative and non-perturbative approaches, and an assessment of signal contributions by astrophysical effects. All weak lensing signals were measured consistently via Fourier-space statistics that are insensitive to the survey mask and display low levels of mode mixing. The calibration of photometric redshift distributions and multiplicative gravitational shear bias has been updated, and a more complete tally of residual calibration uncertainties was propagated into the likelihood. A dedicated suite of more than 20 000 mocks was used to assess the performance of covariance models and to quantify the impact of survey geometry and spatial variations of survey depth on signals and their errors. The sampling distributions for the likelihood and the chi(2) goodness-of-fit statistic have been validated, with proposed changes for calculating the effective number of degrees of freedom. The prior volume was explicitly mapped, and a more conservative, wide top-hat prior on the key structure growth parameter S-8=sigma(8) (Omega(m)/0.3)(1/2) was introduced. The prevalent custom of reporting S-8 weak lensing constraints via point estimates derived from its marginal posterior is highlighted to be easily misinterpreted as yielding systematically low values of S-8, and an alternative estimator and associated credible interval are proposed. Known systematic effects pertaining to weak lensing modelling and inference are shown to bias S-8 by no more than 0.1 standard deviations, with the caveat that no conclusive validation data exist for models of intrinsic galaxy alignments. Compared to the previous KiDS analyses, S-8 constraints are expected to improve by 20% for weak lensing alone and by 29% for the joint analysis.
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