The unidentified PeV source LHAASO J2108+5157: A microquasar remnant?

Josep Mart\'ı, Pedro L. Luque-Escamilla, Leandro Abaroa +4

Context. LHAASO~J2108+5157 is one of the most intriguing Galactic ultra-high-energy $\gamma$-ray sources. It is detected up to hundreds of TeV but lacks a clear counterpart at lower fre…