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We report a detailed study of an unidentified gamma-ray source located in theregion of the compact stellar cluster NGC 3603. This is a star-forming region(SFR) powered by a massive cluster of OB stars. A dedicated analysis of about10 years of data from 10 GeV - 1 TeV, provided by the Large Area Telescope(LAT) onboard the Fermi Gamma-ray Space Telescope, yields the detection of apointlike source at a significance of 9$\sigma$. The source photon spectrum canbe described by a power-law model with best fit spectral index of $2.35 \pm0.03$. In addition, the analysis of a deep Chandra image in the 0.5 - 7 keVband reliably rules out an extragalactic origin for the gamma rays. We alsoconclude that the broadband spectral energy distribution of the point sourcecan be explained well with both leptonic and hadronic models. No firm evidenceof association with any other classes of known gamma-ray emitters is found,therefore we speculate that 4FGL J1115.1-6118 is a gamma-ray emitting SFR.

Morphological and spectral study of 4FGL J1115.1-6118 in the region of the young massive stellar cluster NGC 3603