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With almost 15 years of data taken by the Large Area Telescope (LAT) onboardthe Fermi satellite we discovered an extended source of GeV emission in theregion of the very-high-energy (TeV) source 1LHAASO J1945+2424. This TeV sourceis more extended than the LAT source. The spectrum of the GeV emission is hard(with a photon spectral index ~1.5) and connects smoothly with that of the TeVsource, indicating a likely common origin. In order to explain the origin ofthe gamma rays we explore scenarios which are typically used for supernovaremnants (SNRs) and pulsar wind nebulae (PWN). For an SNR with a singleparticle population, a leptonic particle distribution in the form of a brokenpower-law with a break energy of ~3.7 TeV explains the spectrum well, while inthe hadronic scenario a simple power-law with a hard spectral index of ~1.64 isnecessary. In the PWN scenario, reasonable parameters are obtained for a sourceage of 10 kyr and current pulsar spin-down luminosity of 1e34 erg/s.

Discovery of an extended GeV counterpart to the TeV source 1LHAASO J1945+2424 in Fermi-LAT data