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

Dark Energy Survey Year 1 results: curved-sky weak lensing mass map
Dark Energy Survey Year 1 results: curved-sky weak lensing mass map
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-correlationwith different foreground tracers of mass and (2) exploration of the largest peaks and voids in the maps.
0035-8711
3165-3190
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Chang, C.
9865e1a4-13a6-4624-a0ca-7610cc8c76ad
Pujol, A.
381939b2-14e4-4a3e-89cf-d5f73758ddbd
Mawdsley, B.
a2ecb17e-b8a8-466d-86fd-c3c405078467
DES Collaboration
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Chang, C.
9865e1a4-13a6-4624-a0ca-7610cc8c76ad
Pujol, A.
381939b2-14e4-4a3e-89cf-d5f73758ddbd
Mawdsley, B.
a2ecb17e-b8a8-466d-86fd-c3c405078467

Smith, Mathew, Chang, C., Pujol, A. and Mawdsley, B. , DES Collaboration (2018) Dark Energy Survey Year 1 results: curved-sky weak lensing mass map. Monthly Notices of the Royal Astronomical Society, 475 (3), 3165-3190. (doi:10.1093/mnras/stx3363).

Record type: Article

Abstract

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-correlationwith different foreground tracers of mass and (2) exploration of the largest peaks and voids in the maps.

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More information

Accepted/In Press date: 19 December 2017
e-pub ahead of print date: 4 January 2018

Identifiers

Local EPrints ID: 418459
URI: https://eprints.soton.ac.uk/id/eprint/418459
ISSN: 0035-8711
PURE UUID: b6f95518-d7f1-404e-8dcc-e3fffc332940
ORCID for Mathew Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 09 Mar 2018 17:30
Last modified: 17 May 2019 00:30

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Contributors

Author: Mathew Smith ORCID iD
Author: C. Chang
Author: A. Pujol
Author: B. Mawdsley

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