The Symposium of Ultra-High-Energy Gamma Rays from Supernova Remnants and the Origin of Galactic Cosmic Rays

This report investigates the associations between supernova remnants (SNRs), pulsar wind nebulae (PWNe), and molecular clouds (MCs), and their role in TeV gamma-ray emission. Based on a systematic CO survey, we reveal that a high proportion (~80%) of Galactic SNRs are associated with MCs. Separately, a statistical analysis of LHAASO TeV sources shows that PWNe and SNRs are major contributors, and that MC-associated PWNe show enhanced TeV emission with a systematic positional offset. Together, the studies establish that SNR/PWN-MC associations are prevalent in the Galaxy and are key environments for the production of very-high-energy radiation.