HESS J1023-575 (Westerlund 2)

[References]

H.E.S.S.: Aharonian, F. et al., Astron. Astrophys. 467, 1075 (2007)
            O.Reimer et al., 30th ICRC (2007) / arXiv:0710.4057 [astro-ph] p.92
            Abramowski, A. et al., Astron. Astrophys. 525, A45 (2010)