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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 first-year (DES Y1) data. The map, about 10 times larger than previous work, is constructed over a contiguous $$\approx1,500 $$deg$^2$, covering a comoving volume of $$\approx10 $$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 $0.2<1.3,$ 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 $$\sim$$1.5 ($$\sim$$2) when smoothed with a Gaussian filter of $$\sigma_{G}=30$$ (80) arcminutes. The second and third moments of the convergence $$\kappa$$ in the maps are in agreement with simulations. We also find no significant correlation of $$\kappa$$ 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 Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
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:
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. https://doi.org/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. https://doi.org/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 first-year (DES Y1) data. The map, about 10 times larger than previous work, is constructed over a contiguous $\approx1,500 $deg$^2$, covering a comoving volume of $\approx10 $Gpc$^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 $0.2<1.3,$ 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 $\sim$1.5 ($\sim$2) when smoothed with a Gaussian filter of $\sigma_{G}=30$ (80) arcminutes. The second and third moments of the convergence $\kappa$ in the maps are in agreement with simulations. We also find no significant correlation of $\kappa$ 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},
number = 3,
volume = 475,
place = {United States},
year = {Thu Jan 04 00:00:00 EST 2018},
month = {Thu Jan 04 00:00:00 EST 2018}
}

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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 catalog while the number after the semicolon is for the IM3SHAPE catalog. $\bar{z}$ 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 catalogs (see last column in Table 1 of Troxel et al. 2017). The area of the map is = 1,500 deg2 for both METACALIBRATION and IM3SHAPE, where the exact size changes slightly from different photo-z bins and shear catalogs. The HEALPIX maps have a resolution of nside= 1024.« less

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Works referencing / citing this record:

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