• DOI:10.1103/PhysRevD.98.043528
• Corpus ID: 52993521

Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear

@article{Troxel2018DarkES,
  title={Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear},
  author={Michael Troxel and Niall MacCrann and Joe Zuntz and T. F. Eifler and E. Krause and Scott Dodelson and Daniel Gruen and Jonathan A. Blazek and Oliver Friedrich and Simon Samuroff and Judit Prat and Lucas F. Secco and C. L. Davis and Agnes Fert'e and Joseph DeRose and Alex Alarcon and Adam Amara and Eric J. Baxter and Matthew R. Becker and Gary M. Bernstein and Sarah Bridle and R. Cawthon and C. L. Chang and Ami Choi and Juan de Vicente and Alex Drlica-Wagner and J. Elvin-Poole and Joshua A. Frieman and Marco Gatti and William G. Hartley and Klaus Honscheid and Ben Hoyle and Eric M. Huff and Dragan Huterer and B. Jain and Michael Jarvis and Tomasz Kacprzak and Donnacha Kirk and Nickolas Kokron and C. Krawiec and Ofer Lahav and Andrew R. Liddle and John A Peacock and Markus Michael Rau and Alexandre R{\'e}fr{\'e}gier and Richard Rollins and Eduardo Rozo and Eli S. Rykoff and Carles S'anchez and Ignacio Sevilla-Noarbe and Erin S. Sheldon and Albert Stebbins and T. N. Varga and Pauline Vielzeuf and M. Y. Wang and Risa H. Wechsler and Brian Yanny and Timothy M. C. Abbott and Filipe B. Abdalla and Sahar Allam and James T. Annis and Keith C. Bechtol and Aur{\'e}lien Benoit-L{\'e}vy and Emmanuel Bertin and David Brooks and Elizabeth Buckley-Geer and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Francisco J. Castander and Mart{\'i}n Crocce and Carlos E. Cunha and Chris D'Andrea and Luiz Nicolaci da Costa and Darren Lee Depoy and Shantanu Desai and H. Thomas Diehl and J. P. Dietrich and Peter Doel and Eduardo B. Fernandez and Brenna L. Flaugher and Pablo Fosalba and Juan Garc'ia-Bellido and Enrique Gazta{\~n}aga and David W. Gerdes and T. Giannantonio and Daniel A. Goldstein and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and David J. James and Tesla E. Jeltema and M. W. G. Johnson and M. D. Johnson and Stephen Kent and Kyler W. Kuehn and Stephen E. Kuhlmann and Nikolay Kuropatkin and T. S. Li and Marcos Lima and H. Lin and Marcio A. G. Maia and M March and Jennifer L. Marshall and Paul Martini and Peter Melchior and Felipe Menanteau and Ramon Miquel and Joseph J. Mohr and Eric H. Neilsen and Robert C. Nichol and Brian Nord and Don Petravick and Andreas Alejandro Plazas and A. K. Romer and Aaron Roodman and Masao Sako and Eusebio S{\'a}nchez and Victor E. Scarpine and Rafe H. Schindler and Michael S. Schubnell and M. Smith and R. C. Smith and Marcelle Soares-Santos and Flavia Sobreira and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and D. Thomas and Douglas L. Tucker and Vinu Vikram and Alistair R. Walker and Jochen Weller and Y. Zhang},
  journal={Physical Review D},
  year={2018}
}

• M. Troxel, N. MacCrann, +132 authors Y. Zhang
• Published 4 August 2017
• Physics
• Physical Review D

We use 26 million galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg 2 of the sky to produce the most significant measurement of cosmic shear in a galaxy survey to date. We constrain cosmological parameters in both the flat Λ CDM and w CDM models, while also varying the neutrino mass density. These results are shown to be robust using two independent shape catalogs, two independent \photoz\ calibration methods, and two independent analysis pipelines in a blind analysis. We find a 3.5\% fractional uncertainty on σ 8 (Ω m /0.3) 0.5 =0.782 +0.027 −0.027 at 68\% CL, which is a factor of 2.5 improvement over the fractional constraining power of our DES Science Verification results. In w CDM, we find a 4.8\% fractional uncertainty on σ 8 (Ω m /0.3) 0.5 =0.777 +0.036 −0.038 and a dark energy equation-of-state w=−0.95 +0.33 −0.39. We find results that are consistent with previous cosmic shear constraints in σ 8 -- Ω m, and see no evidence for disagreement of our weak lensing data with data from the CMB. Finally, we find no evidence preferring a w CDM model allowing w≠−1 . We expect further significant improvements with subsequent years of DES data, which will more than triple the sky coverage of our shape catalogs and double the effective integrated exposure time per galaxy.