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29 March 2024
 
  » arxiv » 1708.1538

 Article overview


Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
M. A. Troxel ; N. MacCrann ; J. Zuntz ; T. F. Eifler ; E. Krause ; S. Dodelson ; D. Gruen ; J. Blazek ; O. Friedrich ; S. Samuroff ; J. Prat ; L. F. Secco ; C. Davis ; A. Ferté ; J. DeRose ; A. Alarcon ; A. Amara ; E. Baxter ; M. R. Becker ; G. M. Bernstein ; S. L. Bridle ; R. Cawthon ; C. Chang ; A. Choi ; J. De Vicente ; A. Drlica-Wagner ; J. Elvin-Poole ; J. Frieman ; M. Gatti ; W. G. Hartley ; K. Honscheid ; B. Hoyle ; E. M. Huff ; D. Huterer ; B. Jain ; M. Jarvis ; T. Kacprzak ; D. Kirk ; N. Kokron ; C. Krawiec ; O. Lahav ; A. R. Liddle ; J. Peacock ; M. M. Rau ; A. Refregier ; R. P. Rollins ; E. Rozo ; E. S. Rykoff ; C. Sánchez ; I. Sevilla-Noarbe ; E. Sheldon ; A. Stebbins ; T. N. Varga ; P. Vielzeuf ; M. Wang ; R. H. Wechsler ; B. Yanny ; T. M. C. Abbott ; F. B. Abdalla ; S. Allam ; J. Annis ; K. Bechtol ; A. Benoit-Lévy ; E. Bertin ; D. Brooks ; E. Buckley-Geer ; D. L. Burke ; A. Carnero Rosell ; M. Carrasco Kind ; J. Carretero ; F. J. Castander ; M. Crocce ; C. E. Cunha ; C. B. D'Andrea ; L. N. da Costa ; D. L. DePoy ; S. Desai ; H. T. Diehl ; J. P. Dietrich ; P. Doel ; E. Fernandez ; B. Flaugher ; P. Fosalba ; J. García-Bellido ; E. Gaztanaga ; D. W. Gerdes ; T. Giannantonio ; D. A. Goldstein ; R. A. Gruendl ; J. Gschwend ; G. Gutierrez ; D. J. James ; T. Jeltema ; M. W. G. Johnson ; M. D. Johnson ; S. Kent ; K. Kuehn ; S. Kuhlmann ; N. Kuropatkin ; T. S. Li ; M. Lima ; H. Lin ; M. A. G. Maia ; M. March ; J. L. Marshall ; P. Martini ; P. Melchior ; F. Menanteau ; R. Miquel ; J. J. Mohr ; E. Neilsen ; R. C. Nichol ; B. Nord ; D. Petravick ; A. A. Plazas ; A. K. Romer ; A. Roodman ; M. Sako ; E. Sanchez ; V. Scarpine ; R. Schindler ; M. Schubnell ; M. Smith ; R. C. Smith ; M. Soares-Santos ; F. Sobreira ; E. Suchyta ; M. E. C. Swanson ; G. Tarle ; D. Thomas ; D. L. Tucker ; V. Vikram ; A. R. Walker ; J. Weller ; Y. Zhang ;
Date 4 Aug 2017
AbstractWe 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 $Lambda$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 photo-$z$ calibration methods, and two independent analysis pipelines in a blind analysis. We find a 3% fractional uncertainty on $sigma_8(Omega_m/0.3)^{0.5} = 0.789^{+0.024}_{-0.026}$ at 68% CL, which is a factor of three improvement over the fractional constraining power of our DES Science Verification results and a factor 1.5 tighter than the previous state-of-the-art cosmic shear results. In $w$CDM, we find a 5% fractional uncertainty on $sigma_8(Omega_m/0.3)^{0.5} = 0.789^{+0.036}_{-0.038}$ and a dark energy equation-of-state $w=-0.82^{+0.26}_{-0.48}$. Though we find results that are consistent with previous cosmic shear constraints in $sigma_8$ - $Omega_m$, we nevertheless 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 $w e -1$. 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.
Source arXiv, 1708.1538
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