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Published online by Cambridge University Press: 25 May 2016
The observational tests to check the concept of nonthermal particle generation in the vicinity of OB associations embedded in a superbubble (SB) are discussed. Acceleration of nonthermal charged particles is expected to be very efficient due to powerful energy release by supernovae and colliding stellar winds. The distinctive features of the SB's emission spectra due to nonthermal particle interaction with gas, dust and electromagnetic fields are summarized.