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4FGL J0822.8-4207 is a point source found in the 4FGL-DR2 catalog by thegamma-ray observatory Fermi-LAT and has no known association. We carry outX-ray observations of 4FGL J0822.8-4207 to help understand its nature. Weexplore two scenarios for the origin of 4FGL J0822.8-4207. In the first case westudy the possibility that cosmic rays from the supernova remnant (SNR) PuppisA, seen nearby in the sky, reach the dense gas at the location of the sourceand produce the gamma-rays through inelastic proton-proton collisions. We applya standard model for particle diffusion in the interstellar medium and derivethe required physical parameters. We find that this scenario for the gamma raysis possible if the gas is located at a distance that is not higher than ~40 pcfrom Puppis A, unless the SNR is older than 7 kyr or the diffusion coefficientis higher than typical Galactic values, and relatively low-energy cosmic raysare currently escaping from the SNR. In the second scenario, we consider theprotostellar jet HH219 as the origin of the GeV source and find the veryinteresting possibility that particles could be accelerated up to energies ofat least several TeV in HH219. This would make this system the first known ofits kind to produce gamma-ray emission extending up to hundreds of GeV withoutany apparent cutoff and an excellent laboratory to study the process ofparticle acceleration.

Probing the origin of 4FGL J0822.8-4207: cosmic ray illumination from the SNR Puppis A and the Herbig-Haro object HH219