Resolved Galactic Sources
Later observations added to the database support the theory that the source 2CG353+16 is the Rho Ophiuchi cloud complex. In the combined data the cloud complex has become resolved and is no longer considered a point-source. The production mechanism for gamma-ray emission is cosmic-ray bombardment of gas in the cloud complex 190pc away, although predictions differ slightly (by about a factor of 2) with the observations (Ref.6).
This conclusion is complementary with the observation of gamma-rays from the Orion nebula by Cos-B. The gamma-ray intensity agrees very well with predictions modelled on latest available HI, HII and H2 data under the assumption of local cosmic ray flux (Ref.7).