The research titled as “Jitter Mechanism as a Kind of Coherent Radiation: Constrained by the GRB 221009A Emission at 18 TeV” has been published in The Astrophysical Journal on April 4. It is on the radiation mechanism of the “brightest of all time” gamma-ray burst.

Gamma-ray burst is the most violent explosion in the universe. The research on gamma-ray burst, including central engine, magnetized dynamics of plasmas, and the radiation, is one of the hot topics in the high-energy astrophysical research.

The so-called “brightest of all time” gamma-ray burst, GRB 221009A, has been detected by satellites and ground-based telescopes in the world. The burst has the strong emission in the TeV energy band. In particular, the large high altitude air shower observatory（LHAASO）, as one important large scientific device of China, has the achievement on the photons at 18 TeV.

In order to explain the observational results from the theoretical point of view, Professors MAO Jirong and WANG Jiancheng in Yunnan Observatories (YNAO) of the Chinese Academy of Sciences (CAS) have developed a new style to apply the radiation of the relativistic electrons in the random and small-scale magnetic field. They utilize the Landau damping, which is one plasma effect, to constrain the maximum frequency of the radiation. In the theoretical research, they innovatively apply this mechanism as a kind of coherent emission to do calculation and obtain the radiation flux. Thus, the radiation properties of the burst are theoretically interpreted by this novel theory model. In addition, it is explored by the research that gamma-ray burst might be a kind of particle accelerator of high-energy cosmic ray.

YNAO is a partner inside the LHAASO collaboration. The research reported here is a theoretical exploration focusing on the observational results obtained from the Chinese large scientific device. The research is also important for the further understanding on the radiation mechanism of high-energy objects in the future.

This work is supported by the National Natural Science Foundation of China (NSFC) and Yunnan Revitalization Talent Support Program.

Contact:
MAO Jirong
Yunnan Observatories, CAS
Email: jirongmao@mail.ynao.ac.cn

The radiation flux as function of the spectral index of the turbulence indicates that the physics of the magnetized turbulence in plasmas plays a vital role on the jitter radiation.