Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis
Abstract
Weak gravitational lensing allows one to reconstruct the spatial distribution of the projected mass density across the sky. These “mass maps” provide a powerful tool for studying cosmology as they probe both luminous and dark matter. In this paper, we present a weak lensing mass map reconstructed from shear measurements in a 139 deg2 area from the Dark Energy Survey (DES) science verification data. We compare the distribution of mass with that of the foreground distribution of galaxies and clusters. The overdensities in the reconstructed map correlate well with the distribution of optically detected clusters. We demonstrate that candidate superclusters and voids along the line of sight can be identified, exploiting the tight scatter of the cluster photometric redshifts. We cross-correlate the mass map with a foreground magnitude-limited galaxy sample from the same data. Our measurement gives results consistent with mock catalogs from N-body simulations that include the primary sources of statistical uncertainties in the galaxy, lensing, and photo-z catalogs. The statistical significance of the cross-correlation is at the 6.8σ level with 20 arcminute smoothing. We find that the contribution of systematics to the lensing mass maps is generally within measurement uncertainties. In this study, we analyze less than 3%more »
- Authors:
-
- Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Pennsylvania, Philadelphia, PA (United States). et al.
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- DES
- OSTI Identifier:
- 1212746
- Alternate Identifier(s):
- OSTI ID: 1204702; OSTI ID: 1221762
- Report Number(s):
- FERMILAB-PUB-15-148-AE; BNL-108400-2015-JA
Journal ID: ISSN 1550-7998; PRVDAQ; arXiv eprint number arXiv:1504.03002
- Grant/Contract Number:
- AC02-07CH11359; SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1550-7998
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Vikram, V. Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis. United States: N. p., 2015.
Web. doi:10.1103/PhysRevD.92.022006.
Vikram, V. Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis. United States. https://doi.org/10.1103/PhysRevD.92.022006
Vikram, V. Wed .
"Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis". United States. https://doi.org/10.1103/PhysRevD.92.022006. https://www.osti.gov/servlets/purl/1212746.
@article{osti_1212746,
title = {Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis},
author = {Vikram, V.},
abstractNote = {Weak gravitational lensing allows one to reconstruct the spatial distribution of the projected mass density across the sky. These “mass maps” provide a powerful tool for studying cosmology as they probe both luminous and dark matter. In this paper, we present a weak lensing mass map reconstructed from shear measurements in a 139 deg2 area from the Dark Energy Survey (DES) science verification data. We compare the distribution of mass with that of the foreground distribution of galaxies and clusters. The overdensities in the reconstructed map correlate well with the distribution of optically detected clusters. We demonstrate that candidate superclusters and voids along the line of sight can be identified, exploiting the tight scatter of the cluster photometric redshifts. We cross-correlate the mass map with a foreground magnitude-limited galaxy sample from the same data. Our measurement gives results consistent with mock catalogs from N-body simulations that include the primary sources of statistical uncertainties in the galaxy, lensing, and photo-z catalogs. The statistical significance of the cross-correlation is at the 6.8σ level with 20 arcminute smoothing. We find that the contribution of systematics to the lensing mass maps is generally within measurement uncertainties. In this study, we analyze less than 3% of the final area that will be mapped by the DES; the tools and analysis techniques developed in this paper can be applied to forthcoming larger data sets from the survey.},
doi = {10.1103/PhysRevD.92.022006},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 2,
volume = 92,
place = {United States},
year = {Wed Jul 29 00:00:00 EDT 2015},
month = {Wed Jul 29 00:00:00 EDT 2015}
}
Web of Science
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