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

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 previous work, is constructed over a contiguous ≈1;500 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 catalogs, 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 and the B-mode map is ~1.5 (~2) when smoothed with a Gaussian filter of sG =30 (80) arcminutes. The second and third moments of the convergence k in the maps are in agreement with simulations. We also find no significant correlation of k 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1389249
Alternate Identifier(s):
OSTI ID: 1398806; OSTI ID: 1422380
Report Number(s):
BNL-114271-2017-JA; FERMILAB-PUB-17-295-AE; arXiv:1708.01535
Journal ID: ISSN 0035-8711
Grant/Contract Number:  
SC0012704; AC02-07CH11359; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 475; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gravitational lensing: weak; surveys; dark matter

Citation Formats

Chang, C., Sheldon, E., Pujol, A., Mawdsley, B., Bacon, D., Elvin-Poole, J., Melchior, P., and et al. Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map. United States: N. p., 2018. Web. doi:10.1093/mnras/stx3363.
Chang, C., Sheldon, E., Pujol, A., Mawdsley, B., Bacon, D., Elvin-Poole, J., Melchior, P., & et al. Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map. United States. doi:10.1093/mnras/stx3363.
Chang, C., Sheldon, E., Pujol, A., Mawdsley, B., Bacon, D., Elvin-Poole, J., Melchior, P., and et al. Thu . "Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map". United States. doi:10.1093/mnras/stx3363. https://www.osti.gov/servlets/purl/1389249.
@article{osti_1389249,
title = {Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map},
author = {Chang, C. and Sheldon, E. and Pujol, A. and Mawdsley, B. and Bacon, D. and Elvin-Poole, J. and Melchior, P. and et al.},
abstractNote = {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 previous work, is constructed over a contiguous ≈1;500 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 catalogs, 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 and the B-mode map is ~1.5 (~2) when smoothed with a Gaussian filter of sG =30 (80) arcminutes. The second and third moments of the convergence k in the maps are in agreement with simulations. We also find no significant correlation of k 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.},
doi = {10.1093/mnras/stx3363},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {0035-8711},
number = 3,
volume = 475,
place = {United States},
year = {2018},
month = {1}
}

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Cited by: 8 works
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Figures / Tables:

Table 1 Table 1: Characteristics of the source galaxy samples and the maps. The number preceding the semicolon is for the METACALIBRATION catalogue while the number after the semicolon is for the IM3SHAPE catalogue. z̄ is the mean redshift estimate from BPZ for each sample, while σε is the mean of σε1more » and σε2 , the standard deviation of the weighted galaxy shapes reported from the catalogues (see the last column in table 1 of Troxel et al. 2017). The area of the map is ∼1500 deg2 for both METACALIBRATION and IM3SHAPE, where the exact size changes slightly from different photo-z bins and shear catalogues. The HEALPIX maps have a resolution of nside=1024.« less

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