Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis

Vikram, V.

doi:10.1103/PhysRevD.92.022006

Title: Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis

Journal Article · Wed Jul 29 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.92.022006· OSTI ID:1212746

Vikram, V. ^[1]

Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Pennsylvania, Philadelphia, PA (United States). et al.

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.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: DES

Grant/Contract Number:: AC02-07CH11359; SC00112704

OSTI ID:: 1212746

Alternate ID(s):: OSTI ID: 1204702; OSTI ID: 1221762

Report Number(s):: FERMILAB-PUB-15-148-AE; BNL-108400-2015-JA; PRVDAQ; arXiv eprint number arXiv:1504.03002

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 2; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

Citation information provided by
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