Dark Energy Survey Year 1 results: curved-sky weak lensing mass map

Chang, C and Desai, Shantanu and al, et (2018) Dark Energy Survey Year 1 results: curved-sky weak lensing mass map. Monthly Notices of the Royal Astronomical Society, 475 (3). 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.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Uncontrolled Keywords: gravitational lensing, weak, surveys, dark matter
Subjects: Physics
Divisions: Department of Physics
Depositing User: Library Staff
Date Deposited: 17 Jan 2019 10:00
Last Modified: 17 Jan 2019 10:00
URI: http://raiith.iith.ac.in/id/eprint/4726
Publisher URL: http://dx.doi.org/10.1093/mnras/stx3363
OA policy: http://www.sherpa.ac.uk/romeo/issn/0035-8711/
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