TeV gamma-rays can result from the photo-de-excitation of PeV cosmic ray nuclei after their parents have undergone photo-disintegration in an environment of ultraviolet photons. This process is proposed as a candidate explanation of the recently discovered HESS source at the edge of Westerlund 2. The UV background is provided by Lyman-alpha emission within the rich O and B stellar environment. ...

High resolution far-infrared observations of a large area of the star forming complex RCW 106 obtained using the TIFR 1m balloon-borne telescope are presented. Intensity maps have been obtained simultaneously in two bands centred around 150 and 210 µm. Intensity maps have also been obtained at the four IRAS bands using HIRES processed IRAS data. From the 150 and 210 µm maps, reliable maps of du...