Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map

Collaboration
Aug 4, 2017
26 pages
Published in:
  • Mon.Not.Roy.Astron.Soc. 475 (2018) 3, 3165-3190
  • Published: Apr 11, 2018
e-Print:
Report number:
  • FERMILAB-PUB-17-295-AE
Experiments:

Citations per year

20172019202120232025051015
Abstract: (Oxford University Press)
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 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 σ_G = 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
Note:
  • 25 pages, 19 figures, 1 table; revision with changes implemented according to journal referee
  • gravitational lensing: weak
  • surveys
  • dark matter