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Cosmology from large-scale galaxy clustering and galaxy-galaxy lensing with dark energy survey science verification data

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journal contribution
posted on 2023-06-09, 04:11 authored by Kathy RomerKathy Romer, The DES Collaboration
We 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 Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

464

Page range

4045-4062

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-11-28

First Open Access (FOA) Date

2016-11-28

First Compliant Deposit (FCD) Date

2016-11-25

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