HESS upper limit on the very high energy gamma-ray emissionfrom the globular cluster 47 Tucanae - Aharonian, Felix A.; Becherini, Yvonne; Behera, Bagmeet; Emmanoulopoulos, Dimitrios; Hauser, Marcus; Kaufmann, Sarah; Pühlhofer, Gerd; Quirrenbach, Andreas; Schwemmer, Stephanie; Wagner, Stefan (Astronomy and astrophysics, 2009)