10-1093-mnras-stw2464.pdf (1.91 MB)
Cosmology from large-scale galaxy clustering and galaxy-galaxy lensing with dark energy survey science verification data
journal contribution
posted on 2023-06-09, 04:11 authored by Kathy RomerKathy Romer, The DES CollaborationWe present cosmological constraints from the Dark Energy Survey (DES) using a combined analysis of angular clustering of red galaxies and their cross-correlation with weak gravitational lensing of background galaxies. We use a 139 deg2 contiguous patch of DES data from the Science Verification (SV) period of observations. Using large-scale measurements, we constrain the matter density of the Universe as Om = 0.31 ± 0.09 and the clustering amplitude of the matter power spectrum as s8 = 0.74 ± 0.13 after marginalizing over seven nuisance parameters and three additional cosmological parameters. This translates into S8 = s8(Om/0.3)0.16 = 0.74 ± 0.12 for our fiducial lens redshift bin at 0.35 < z < 0.5, while S8 = 0.78 ± 0.09 using two bins over the range 0.2 < z < 0.5. We study the robustness of the results under changes in the data vectors, modelling and systematics treatment, including photometric redshift and shear calibration uncertainties, and find consistency in the derived cosmological parameters. We show that our results are consistent with previous cosmological analyses from DES and other data sets and conclude with a joint analysis of DES angular clustering and galaxy–galaxy lensing with Planck Cosmic Microwave Background data, baryon acoustic oscillations and Supernova Type Ia measurements.
Funding
Consolidated Grant; G0927; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/K001329/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
4Volume
464Page range
4045-4062Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-11-28First Open Access (FOA) Date
2016-11-28First Compliant Deposit (FCD) Date
2016-11-25Usage metrics
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