Dark energy survey year 1 results: curved-sky weak lensing mass map

Chang, C, Pujol, A, Mawdsley, B, Bacon, D, Elvin-Poole, J, Melchior, P, Kovács, A, Jain, B, Leistedt, B, Romer, A K and The, DES Collaboration (2018) Dark energy survey year 1 results: curved-sky weak lensing mass map. Monthly Notices Of The Royal Astronomical Society, 475 (03). pp. 3165-3190. ISSN 0035-8711

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We construct the largest curved-sky galaxy weak lensing mass map to date from the DES first-year (DES Y1) data. The map, about 10 times larger than the previous work, is constructed over a contiguous ≈1500 deg2, covering a comoving volume of ≈10 Gpc3. The effects of masking, sampling, and noise are tested using simulations. We generate weak lensing maps from two DES Y1 shear catalogues, METACALIBRATION and IM3SHAPE, with sources at redshift 0.2 < z < 1.3, and in each of four bins in this range. In the highest signal-to-noise map, the ratio between the mean signal to noise in the E-mode map and the B-mode map is ∼1.5 (∼2) when smoothed with a Gaussian filter of σG = 30 (80) arcmin. The second and third moments of the convergence κ in the maps are in agreement with simulations. We also find no significant correlation of κ with maps of potential systematic contaminants. Finally, we demonstrate two applications of the mass maps: (1) cross-correlation with different foreground tracers of mass and (2) exploration of the largest peaks and voids in the maps.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
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Depositing User: Billy Wichaidit
Date Deposited: 05 Mar 2018 10:30
Last Modified: 03 Jul 2018 15:43
URI: http://srodev.sussex.ac.uk/id/eprint/74194

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Project NameSussex Project NumberFunderFunder Ref
University of Sussex Astronomy Consolidated Grant 2017-2020G2050STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000525/1