Interpreting the multi-TeV emission from GRB 221009A with a second electron component accelerated by turbulence in the jet
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911045492146176 |
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| author | Gong, Xing-Wei Liu, Ruo-Yu Zhang, Ze-Lin Asano, Katsuaki Lemoine, Martin |
| author_facet | Gong, Xing-Wei Liu, Ruo-Yu Zhang, Ze-Lin Asano, Katsuaki Lemoine, Martin |
| contents | The detection of very high-energy (VHE) afterglow emission of the gamma-ray burst (GRB) 221009A by the Large High Altitude Air Shower Observatory (LHAASO) provides a unique opportunity to probe particle acceleration in relativistic outflows. The hard spectrum at multi-TeV band cannot be fully explained by synchrotron-self-Compton radiation of the conventional one-zone afterglow model. In this work, we introduce a second component of relativistic electrons from stochastic acceleration via downstream turbulence of the external shock. Using a Fokker-Planck approach to model the evolution of protons and electrons, and the non-linear feedback of turbulence damping, we show that the inverse Compton radiation of the second electron component may harden the observed spectrum above multi-TeV energy, and significantly ameliorate the fitting to the spectral evolution measured by LHAASO without violating lower-energy observations. We also discuss the potential presence of the second electron component in other GRB afterglows, which may provide a possible observational signature for future studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_05968 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interpreting the multi-TeV emission from GRB 221009A with a second electron component accelerated by turbulence in the jet Gong, Xing-Wei Liu, Ruo-Yu Zhang, Ze-Lin Asano, Katsuaki Lemoine, Martin High Energy Astrophysical Phenomena The detection of very high-energy (VHE) afterglow emission of the gamma-ray burst (GRB) 221009A by the Large High Altitude Air Shower Observatory (LHAASO) provides a unique opportunity to probe particle acceleration in relativistic outflows. The hard spectrum at multi-TeV band cannot be fully explained by synchrotron-self-Compton radiation of the conventional one-zone afterglow model. In this work, we introduce a second component of relativistic electrons from stochastic acceleration via downstream turbulence of the external shock. Using a Fokker-Planck approach to model the evolution of protons and electrons, and the non-linear feedback of turbulence damping, we show that the inverse Compton radiation of the second electron component may harden the observed spectrum above multi-TeV energy, and significantly ameliorate the fitting to the spectral evolution measured by LHAASO without violating lower-energy observations. We also discuss the potential presence of the second electron component in other GRB afterglows, which may provide a possible observational signature for future studies. |
| title | Interpreting the multi-TeV emission from GRB 221009A with a second electron component accelerated by turbulence in the jet |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.05968 |