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H.E.S.S. observations of the old-age (>10^4yr; ~0.5deg diameter) compositesupernova remnant (SNR) W 28 reveal very high energy (VHE) gamma-ray emissionsituated at its northeastern and southern boundaries. The northeastern VHEsource (HESS J1801-233) is in an area where W 28 is interacting with a densemolecular cloud, containing OH masers, local radio and X-ray peaks. Thesouthern VHE sources (HESS J1800-240 with components labelled A, B and C) arefound in a region occupied by several HII regions, including the ultracompactHII region W 28A2. Our analysis of NANTEN CO data reveals a dense molecularcloud enveloping this southern region, and our reanalysis of EGRET data revealsMeV/GeV emission centred on HESS J1801-233 and the northeastern interactionregion.

Discovery of very high energy gamma-ray emission in the W 28 (G6.4-0.1) region, and multiwavelength comparisons