Multi-messenger Hunt for PeVatrons

Cosmic rays with energies up to a few PeV (10¹⁵ PeV) are believed to originate from our own galaxy. However, the origin of Galactic cosmic-rays has remained a mystery for over a century since their discovery. H.E.S.S. observatory discovered a PeVatron within 10 parsecs of the center of our galaxy, which pointed to the supermassive black hole Sgr A* as a potential cosmic ray source. Most recently, LHAASO detected 43 PeVatron candidates distributed along the Galactic Plane. The IceCube neutrino observatory identified neutrino emission from the Galactic plane at 4.5 σ, confirming existence of hadronic PeVatrons in the Milky Way galaxy. In this presentation, I will describe current attempts to find multi-messenger observational evidence for Galactic PeVatrons. In addition, I will introduce our ongoing efforts to uncover and identify a new type of extragalactic PeVatrons as Seyfert galaxies.