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We present a mass map reconstructed from weak gravitational lensing shearmeasurements over 139 sq. deg from the Dark Energy Survey (DES) ScienceVerification data. The mass map probes both luminous and dark matter, thusproviding a tool for studying cosmology. We find good agreement between themass map and the distribution of massive galaxy clusters identified using ared-sequence cluster finder. Potential candidates for super-clusters and voidsare identified using these maps. We measure the cross-correlation between themass map and a magnitude-limited foreground galaxy sample and find a detectionat the 5-7 sigma level on a large range of scales. These measurements areconsistent with simulated galaxy catalogs based on LCDM N-body simulations,suggesting low systematics uncertainties in the map. We summarize our keyfindings in this letter; the detailed methodology and tests for systematics arepresented in a companion paper.

Wide-Field Lensing Mass Maps from DES Science Verification Data