"Gamma-rays radiated by dense molecular clouds located in the vicinity of a youngproton accelerator, where the density of relativistic particles significantly exceeds the average level of the ""sea"" of galacticdetermined by the mixture of contributions from all individual sources during the CR propagation in the Galactic Disk on timescalesThe particle accelerator itself is a source of Y-rays, but its intensity could be quite low due to the lack of sufficiently dense target material inside compared to the average density of the interstellar mediumAlso, the Y-ray spectrum could be suppressed at very high energies due to the energy-dependent escape of particles from the accelerator."
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