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Dark energy survey year 1 results: curved-sky weak lensing mass map
journal contribution
posted on 2023-06-09, 12:22 authored by C Chang, A Pujol, B Mawdsley, D Bacon, J Elvin-Poole, P Melchior, A Kovács, B Jain, B Leistedt, Kathy RomerKathy Romer, DES Collaboration TheWe 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 sG = 30 (80) arcmin. The second and third moments of the convergence ? in the maps are in agreement with simulations. We also find no significant correlation of ? 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.
Funding
University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices Of The Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
03Volume
475Page range
3165-3190Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-03-05First Open Access (FOA) Date
2018-03-05First Compliant Deposit (FCD) Date
2018-03-02Usage metrics
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