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The identification of active PeVatrons, hadronic particle acceleratorsreaching the knee of the cosmic-ray spectrum (at the energy of few PeV), iscrucial to understand the origin of cosmic rays in the Galaxy. In this context,we report on new H.E.S.S. observations of the PeVatron candidate HESSJ1702-420, which reveal the presence of gamma-rays up to 100 TeV. This is thefirst time in the history of H.E.S.S. that photons with such high energy areclearly detected. Remarkably, the new deep observations allowed the discoveryof a new gamma-ray source component, called HESS J1702-420A, that waspreviously hidden under the bulk emission traditionally associated withHESSJ1702-420. This new object has a power-law spectral slope < 2 and agamma-ray spectrum that, extending with no sign of curvature up to 100 TeV,makes it an excellent candidate site for the presence of PeV-energy cosmicrays. This discovery brings new information to the ongoing debate on the natureof the unidentified source HESSJ1702-420, one of the most compelling PeVatroncandidates in the gamma-ray sky, and on the origin of Galactic cosmic rays.

Evidence of 100 TeV ${\gamma}$-ray emission from HESS J1702-420: A new PeVatron candidate