Multi-messenger Probe of Galactic Pevatrons

The origin of cosmic rays has remained a century-old problem since their discovery in 1912. The LHAASO observatory has recently discovered 43 ultra-high-energy (UHE) gamma-ray sources detected above 100 keV, most of which located in the Galactic plane. These extremely energetic sources can accelerate protons or electrons into PeV energies (so-called PeVatrons) that produce the UHE gamma-ray photons via proton-proton or proton-gamma collision. ost recently, The IceCube neutrino observatory reported the discovery of neutrino signals from the Galactic plane, confirming the existence of hadronic PeVatrons in our galaxy. These breakthroughs marked that we are entering a golden age for Galactic PeVatron hnting. In this presentation, I will introduce our on-going efforts on identification of multiple LHAASO PeVatrons by combining multi-wavelength observations obtained by X-rays, gamma-rays and radio observatories. I will showcase a few succesfful discoveries of low-energy counterparts of LHAASO sources that led us to identify their source nature. I am also going to discuss our plan fto search for neutrino counterparts for hardronic PeVatrons. These efforts will take us one more step towards asnwering the century-old question of the origin of PeVatrons in our galaxy.