Chang, C;
Pujol, A;
Mawdsley, B;
Bacon, D;
Elvin-Poole, J;
Melchior, P;
Kovács, A;
... Dietrich, JP; + view all
(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.
10.1093/mnras/stx3363.
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Abstract
We construct the largest curved-sky galaxy weak lensing mass map to date from the DES firstyear (DES Y1) data. The map, about 10 times larger than the previous work, is constructed over a contiguous ≈1500 deg 2 , covering a comoving volume of ≈10 Gpc 3 . 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 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.
| Type: | Article |
|---|---|
| Title: | Dark Energy Survey Year 1 results: Curved-sky weak lensing mass map |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx3363 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stx3363 |
| Language: | English |
| Additional information: | © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Gravitational lensing: weak, surveys, dark matter |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1571426 |
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