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The H.E.S.S. collaboration has discovered a new very high energy (VHE, E $>$0.1 TeV) $\gamma$-ray source, HESS J1741-302, located in the Galactic plane.Despite several attempts to constrain its nature, no plausible counterpart hasbeen found so far at X-ray and MeV/GeV $\gamma$-ray energies, and the sourceremains unidentified. An analysis of 145-hour of observations of HESS J1741-302at VHEs has revealed a steady and relatively weak TeV source ($\sim$1$\%$ ofthe Crab Nebula flux), with a spectral index of $\Gamma$ = 2.3 $\pm$0.2$_{\text{stat}}$ $\pm$ 0.2$_{\text{sys}}$, extending to energies up to 10TeV without any clear signature of a cut-off. In a hadronic scenario, such aspectrum implies an object with particle acceleration up to energies of severalhundred TeV. Contrary to most H.E.S.S. unidentified sources, the angular sizeof HESS J1741-302 is compatible with the H.E.S.S. point spread function atVHEs, with an extension constrained to be below 0.068$^{\circ}$ at a 99$\%$confidence level. The $\gamma$-ray emission detected by H.E.S.S. can beexplained both within a hadronic scenario, due to collisions of protons withenergies of hundreds of TeV with dense molecular clouds, and in a leptonicscenario, as a relic pulsar wind nebula, possibly powered by the middle-aged(20 kyr) pulsar PSR B1737-30. A binary scenario, related to the compact radiosource 1LC 358.266+0.038 found to be spatially coincident with the best fitposition of HESS J1741-302, is also envisaged.

HESS J1741-302: a hidden accelerator in the Galactic plane