所属:Graduate School of Science, Osaka University, Institute of Laser Engineering, Osaka University
概要:The 10-year survey data from the IceCube Collaboration has revealed high-energy neutrino spectra from nearby sources, particularly from NGC 1068, a type-2 Seyfert galaxy. The lack of sufficient flux of GeV gamma rays from the same source indicates that neutrinos are produced within an optically thick region, where gamma rays are attenuated. Therefore, the coronal region of the active galactic nucleus (AGN) is believed to be the most likely site for neutrino production. To explain the detected TeV neutrinos from NGC 1068, the acceleration of non-thermal protons of similar energies is expected. However, the mechanism responsible for this acceleration is still debated, with one scenario proposing that protons are accelerated by diffusive shock acceleration (DSA) processes. While widely adopted, DSA scenarios have been limited to ideal analytic models in inferring observational signals. Given the complexity of DSA, more realistic studies are needed to understand the relationship between particle acceleration and coronal properties. In this work, we aim to use particle-in-cell (PIC) simulations to examine the shock acceleration scenario of high-energy neutrino production in NGC 1068. Specifically, we will use collisionless shock simulations with coronal parameters to derive the properties of particle acceleration and subsequent non-thermal emissions. These results will be compared with observational data to assess the possibility of neutrino production in this scenario.
論文掲載,発表実績:
(学術雑誌掲載論文)
- M. N. Ly, T. Sano, Y. Sakawa, and Y. Sentoku, Conditions of Structural Transition for Collisionless Electrostatic Shock, Phys. Rev. E 108, 025208 (Aug. 2023).
(国内研究会等発表論文)
- M. N. Ly, T. Sano, Y. Sakawa, and Y. Sentoku, The impacts of downstream heating on ion reflection for collisionless electrostatic shock, Japan Physical Society annual meeting (Sept 2023).
Posted : 2024年03月31日