Wide-Field Lensing Mass Maps from Dark Energy Survey Science Verification Data

Chang, C. and Vikram, V. and Jain, B. and Bacon, D. and Amara, A. and Becker, M. R. and Bernstein, G. and Bonnett, C. and Bridle, S. and Brout, D. and Busha, M. and Frieman, J. and Gaztanaga, E. and Hartley, W. and Jarvis, M. and Kacprzak, T. and Kovács, András and Lahav, O. and Lin, H. and Melchior, P. and Peiris, H. and Rozo, E. and Rykoff, E. and Sanchez, C. and Sheldon, E. and Troxel, M. A. and Wechsler, R. and Zuntz, J. and Abbott, T. and Abdalla, F. B. (2015) Wide-Field Lensing Mass Maps from Dark Energy Survey Science Verification Data. PHYSICAL REVIEW LETTERS, 115 (5). ISSN 0031-9007

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Abstract

We present a mass map reconstructed from weak gravitational lensing shear measurements over 139 deg2 from the Dark Energy Survey (DES) Science Verification data. The mass map probes both luminous and dark matter, thus providing a tool for studying cosmology. We find good agreement between the mass map and the distribution of massive galaxy clusters identified using a red-sequence cluster finder. Potential candidates for super-clusters and voids are identified using these maps. We measure the cross-correlation between the mass map and a magnitude-limited foreground galaxy sample and find a detection at the 6.8σ level with 20 arcminute smoothing. These measurements are consistent with simulated galaxy catalogs based on ΛCDM N- body simulations, suggesting low systematics uncertainties in the map. We summarize our key findings in this letter; the detailed methodology and tests for systematics are presented in a companion paper.

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