DeRose, J;
Wechsler, RH;
Becker, MR;
Rykoff, ES;
Pandey, S;
MacCrann, N;
Amon, A;
... Varga, TN; + view all
(2022)
Dark Energy Survey Year 3 results: Cosmology from combined galaxy clustering and lensing validation on cosmological simulations.
Physical Review D: Particles, Fields, Gravitation and Cosmology
, 105
(12)
, Article 123520. 10.1103/PhysRevD.105.123520.
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Abstract
We present a validation of the Dark Energy Survey Year 3 (DES Y3) 3 × 2 -point analysis choices by testing them on Buzzard2.0, a new suite of cosmological simulations that is tailored for the testing and validation of combined galaxy clustering and weak-lensing analyses. We show that the buzzard2.0 simulations accurately reproduce many important aspects of the DES Y3 data, including photometric redshift and magnitude distributions, and the relevant set of two-point clustering and weak-lensing statistics. We then show that our model for the 3 × 2 -point data vector is accurate enough to recover the true cosmology in simulated surveys assuming the true redshift distributions for our source and lens samples, demonstrating robustness to uncertainties in the modeling of the nonlinear matter power spectrum, nonlinear galaxy bias, and higher-order lensing corrections. Additionally, we demonstrate for the first time that our photometric redshift calibration methodology, including information from photometry, spectroscopy, clustering cross-correlations, and galaxy–galaxy lensing ratios, is accurate enough to recover the true cosmology in simulated surveys in the presence of realistic photometric redshift uncertainties.
| Type: | Article |
|---|---|
| Title: | Dark Energy Survey Year 3 results: Cosmology from combined galaxy clustering and lensing validation on cosmological simulations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.105.123520 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.105.123520 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, OSCILLATION SPECTROSCOPIC SURVEY, REDSHIFT DISTRIBUTIONS, DATA RELEASE, SKY SURVEYS, CALIBRATION, SDSS, MODEL, DES, CHALLENGE, IMPACT |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10152808 |
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