Search for a dark matter annihilation signal from the galactic center halo with H.E.S.S. - Abramowski A; Acero F; Aharonian F; Akhperjanian AG; Anton G; Barnacka A; de Almeida UB; Bazer-Bachi AR; Becherini Y; Becker J; Behera B; Bernlöhr K; et al. (Physical review letters, 2011)