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HomeScienceResearchers explore radiation mechanism for 'brightest ever' gamma-ray burst

Researchers explore radiation mechanism for ‘brightest ever’ gamma-ray burst


Jitter radiation flux as a function of spectral index ζs of disturbances. The solid line (purple) indicates the calculation result with parameters γ = 1.0 × 107 and A = 3.0 × 10−5 poison-3. The dashed line (grey) is the LHAASO sensitivity (2000 s) at 18 TeV. credit: Astrophysical Journal (2023). DOI: 10.3847/1538-4357/acc400

A gamma ray burst is the most powerful explosion in the universe. The search for gamma-ray bursts, including the centrifuge and the magneto-plasma and radiation dynamics, is one of the hot topics in high-energy astrophysics research.

The so-called “brightest gamma-ray burst of all time,” GRB 221009A, has been detected by satellites and ground-based telescopes. The eruption has a strong emission in the TeV energy range.

led by prof. Mao Jirong and Wang Jiancheng of the Yunnan Observatories (YNAO) of the Chinese Academy of Sciences (CAS) discovered the radiation mechanism of GRB 221009A. Their findings have been published in Astrophysical Journal on April 4th.

The researchers proposed a new radiation mechanism, that is, the radiation of relativistic electrons in the random and small-scale magnetic field. They applied this mechanism to explain the extremely high energy emission of GRB 221009A. In particular, for this mechanism, they used Landau damping, which is a plasma effect, to constrain GRB 221009A’s emission into the TeV energy range.

Moreover, they treated the mechanism as a type of coherent radiation to reproduce the emission flux of GRB 221009A. Thus, the burst-observing properties are theoretically explained by this radiation mechanism.

more information:
Jirong Mao et al, Vibration mechanism as a type of coherent radiation: constrained by the emission of GRB 221009A at 18 TeV, Astrophysical Journal (2023). DOI: 10.3847/1538-4357/acc400

Provided by the Chinese Academy of Sciences

the quote: Researchers explore radiation mechanism for ‘brightest ever’ gamma-ray burst (2023, April 10), Retrieved April 10, 2023 from https://phys.org/news/2023-04-explore-mechanism-brightest- gamma-ray programming language

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