| 番号 | R8-1 / IPMU/ILANCE/ICRR joint seminar |
| 日時 | 2026年4月23日(木) 15:00- |
| 場所 | 宇宙線研究所6階大セミナー室 Zoom:https://u-tokyo-ac-jp.zoom.us/j/89753963203?pwd=B8EPhmPQZxoyeFc4gtaXmXa2tteFXV.1 |
| 講演者 | Hongjun An (Chungbuk National University) |
| タイトル | Gamma-Ray Emission from Binaries and Pulsar Wind Nebulae: Probing Particle Acceleration and Flow |
| 概要 | Pulsars are the Galaxy’s most formidable natural particle accelerators, capable of driving leptons to PeV energies. While the initial acceleration begins within the pulsar magnetosphere through induced electric fields, the evolution of these high-energy particles extends deep into the surrounding environment. As the relativistic pulsar wind thermalizes against the interstellar medium, supernova ejecta, or the dense stellar winds of a binary companion, powerful termination shocks are formed. These transition regions serve as secondary acceleration sites, manifesting as diverse and luminous non-thermal phenomena across the electromagnetic spectrum. In this seminar, I will explore the complex emission environments of two primary gamma-ray source classes powered by pulsars: high-energy binaries (millisecond and gamma-ray binaries) and pulsar wind nebulae. I will present a multi-wavelength analysis of their X-ray and gamma-ray properties, providing a framework to interpret the physical processes driving their observed spectral and temporal signatures. Specifically, I will detail our recent development of evolutionary multi-zone models designed to track particle transport, flow velocity, and magnetic-field structure in these systems. By applying these models to high-energy data from current observatories, we can constrain the magnetic field structure, particle injection spectra, flow dynamics, and their evolution in these cosmic laboratories. Finally, I will discuss the implications of these findings for our broader understanding of Galactic PeVatrons and outline the critical observational data that the next generation of gamma-ray instruments will provide to further unveil the physics of these extreme environments. |
