Observations of the Monoceros/Rosette nebula with the HEGRA system of IACTs Available to Purchase

The array of 5 imaging atmospheric Čerenkov telescopes (IACTs) deployed at the Canary Island of La Palma, and operated by the HEGRA collaboration, was used for the observations of the interaction region between the Monoceros SNR and the dense Rosette Nebula. At present, the performance of the IACTs array reveals the energy threshold of 500 GeV and the angular resolution of 0.1° for γ-rays. We have mapped the extended sky region of $2°×2°$ associated with the Monoceros SNR/Rosette Nebula, centered towards the hard spectrum X-ray point source SAX $J0635+533$ and which also contains the unidentified EGRET extended γ-ray source 3EG $J0634+0521.$ Based on the Monte Carlo simulations we have studied the response of the IACTs array over its $5⋅10−3 str$ field of view with respect to the cosmic rays and diffuse γ-ray emission. We concluded almost constant array’s sensitivity to the γ-ray fluxes (with the variation of ⩽10%) within the angular distance of 1 deg from the joint optical axis of the telescopes’ array. Here we present the results of the data analysis.