HESS J1809$-$193: a halo of escaped electrons around a pulsar wind nebula?

H. E. S. S. Collaboration, :, F. Aharonian +151

Context. HESS J1809$-$193 is an unassociated very-high-energy $\gamma$-ray source located on the Galactic plane. While it has been connected to the nebula of the energetic pulsar PSR J1…