Detection of high-energy gamma-ray emission from the globular cluster 47 Tucanae with Fermi. - Abdo AA; Ackermann M; Ajello M; Atwood WB; Axelsson M; Baldini L; Ballet J; Barbiellini G; Bastieri D; Baughman BM; Bechtol K; Bellazzini R; et al. (Science (New York, N.Y.), 2009)