Speaker
Jianeng Zhou
Description
The blazar 1ES 1959+650 is one of the nearest TeV extragalactic sources to us. Its gamma-ray spectrum is very hard, with a spectral index of only around 1.9 in the GeV energy band reported in 3FHL (the 3rd Fermi-LAT high energy sources catalog). Years ago, a TeV orphan flare was discovered in this source, and it was considered a potential neutrino source. Shortly after the real-time transient monitoring system based on LHAASO-WCDA established at the end of 2023, a gammaray flare from 1ES 1959+650 was triggered (ATel #16437). In this talk, we will present the several flare events of this source in 2024 and study its variabilities at multi-wavelength. The rare TeV delay phenomenon may be strong evidence of particle acceleration process.
Authors
Jianeng Zhou
Min Zha
(IHEP)
Dr
Guangman Xiang
(IHEP)
Dr
Liang Chen
(Shanghai Astronomical Observatory, CAS)
Zhiguo Yao
(IHEP, Beijing)
