KiDS plus GAMA: cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing, and angular clustering

被引：169

作者：

van Uitert, Edo ^{[1
]}

Joachimi, Benjamin ^{[1
]}

Joudaki, Shahab ^{[2
,3
,4
]}

Amon, Alexandra ^{[5
]}

Heymans, Catherine ^{[5
]}

Koehlinger, Fabian ^{[6
,7
]}

Asgari, Marika ^{[5
]}

Blake, Chris ^{[2
]}

Choi, Ami ^{[8
]}

Erben, Thomas ^{[9
]}

Farrow, Daniel J. ^{[10
]}

Harnois-Deraps, Joachim ^{[5
]}

Hildebrandt, Hendrik ^{[9
]}

Hoekstra, Henk

Kitching, Thomas D. ^{[11
]}

Klaes, Dominik ^{[9
]}

Kuijken, Konrad

Merten, Julian ^{[4
]}

Miller, Lance ^{[4
]}

Nakajima, Reiko ^{[9
]}

Schneider, Peter ^{[9
]}

Valentijn, Edwin ^{[12
]}

Viola, Massimo ^{[6
]}

机构：

[1] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[2] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

[3] ARC Ctr Excellence All Sky Astrophys CAASTRO, Hawthorn, Vic, Australia

[4] Univ Oxford, Dept Phys, Keble Rd, Oxford OX1 3RH, England

[5] Univ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[6] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[7] Univ Tokyo, Inst Adv Study, Kavli IPMU, WPI, Kashiwa, Chiba 2778583, Japan

[8] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA

[9] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

[10] Max Planck Inst Extraterr Phys, Postfach 1312 Giessenbachstr, D-85741 Garching, Germany

[11] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[12] Univ Groningen, Kapteyn Inst, POB 800, NL-9700 AV Groningen, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 04期

基金：

欧洲研究理事会; 澳大利亚研究理事会;

关键词：

methods: data analysis; methods: statistical; large-scale structure of Universe; SCIENCE VERIFICATION DATA; POWER SPECTRA; PARAMETER CONSTRAINTS; DARK-MATTER; HALO MODEL; REDSHIFT DISTRIBUTIONS; INTRINSIC ALIGNMENTS; 2-POINT STATISTICS; CROSS-CORRELATIONS; III; APPLICATION;

D O I：

10.1093/mnras/sty551

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present cosmological parameter constraints from a joint analysis of three cosmological probes: the tomographic cosmic shear signal in similar to 450 deg(2) of data from the Kilo Degree Survey (KiDS), the galaxy-matter cross-correlation signal of galaxies from the Galaxies And Mass Assembly (GAMA) survey determined with KiDS weak lensing, and the angular correlation function of the same GAMA galaxies. We use fast power spectrum estimators that are based on simple integrals over the real-space correlation functions, and show that they are practically unbiased over relevant angular frequency ranges. We test our full pipeline on numerical simulations that are tailored to KiDS and retrieve the input cosmology. By fitting different combinations of power spectra, we demonstrate that the three probes are internally consistent. For all probes combined, we obtain S-8 = sigma(8)root Omega(m)/0.3 = 0.800(-0.027)(+0.029), consistent with Planck and the fiducial KiDS-450 cosmic shear correlation function results. Marginalizing over wide priors on the mean of the tomographic redshift distributions yields consistent results for S-8 with an increase of 28 per cent in the error. The combination of probes results in a 26 per cent reduction in uncertainties of S-8 over using the cosmic shear power spectra alone. The main gain from these additional probes comes through their constraining power on nuisance parameters, such as the galaxy intrinsic alignment amplitude or potential shifts in the redshift distributions, which are up to a factor of 2 better constrained compared to using cosmic shear alone, demonstrating the value of large-scale structure probe combination.

引用

页码：4662 / 4689

页数：28

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