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

ABSTRACT 4FGL J0822.8–4207 is a point source found in the 4FGL-DR2 catalogue by gamma-ray observatory Fermi-LAT and has no known association. We carry out X-ray observations of to help understand its nature. explore two scenarios for origin . In first case, we study possibility that cosmic rays from supernova remnant (SNR) Puppis A, seen nearby sky, reach dense gas at location produce gamma-rays through inelastic proton–proton collisions. apply standard model particle diffusion interstellar medium derive required physical parameters. find this scenario possible if located distance not higher than ∼40 pc unless SNR older 7 kyr or coefficient typical Galactic values, relatively low-energy are currently escaping SNR. second scenario, consider protostellar jet HH219 as GeV very interesting particles could be accelerated up energies least several TeV HH219. This would make system kind emission extending hundreds without any apparent cut-off an excellent laboratory process acceleration.