Pulsar Wind Nebulae in the era of ultra-high energy gamma-ray observations

Abstract: 

The detection of multiple TeV–PeV gamma-ray sources in our Galaxy by the Large High Altitude Air Shower Observatory (LHAASO) has opened new opportunities to study the nature of Galactic PeVatrons. Several of these ultra-high-energy gamma-ray emitting regions are spatially coincident with pulsar wind nebulae (PWNe). These observations provide direct evidence that electrons can be accelerated to PeV energies in pulsar environments. Furthermore, multiwavelength observations of these sources are crucial for constraining the particle injection spectra, diffusion properties, and magnetic field strengths within the nebulae. In this talk, I will discuss one-zone and diffusion models of electron-positron plasma in PWN and their escape in the formation of the halo regions.