Probable evidence for a transient mega-electron volt emission line in the GRB 221023A
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912318290395136 |
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| author | Jiang, Lu-Yao Wang, Yun Wei, Yu-Jia Wei, Da-Ming Li, Xiang He, Hao-Ning Ren, Jia Shen, Zhao-Qiang Jin, Zhi-Ping |
| author_facet | Jiang, Lu-Yao Wang, Yun Wei, Yu-Jia Wei, Da-Ming Li, Xiang He, Hao-Ning Ren, Jia Shen, Zhao-Qiang Jin, Zhi-Ping |
| contents | Detection of spectral line in gamma-ray bursts (GRBs) is importance for studying GRB physics, as it provides insights into the composition and physical conditions of the GRB environment. However, progress in detecting X-ray or gamma-ray emission and absorption lines in GRB spectra has been relatively slow, only the narrow emission line feature of about 10 MeV found in GRB 221009A has exhibited a significance exceeding $5 σ$. Here, we report the probable evidence of a narrow emission feature at about 2.1 mega-electron volts (MeV) in the spectrum of GRB 221023A. The highest statistical significance of this feature is observed in the time interval between 8 and 30 seconds after Fermi Gamma-Ray Burst Monitor trigger, with the chance probability value $<2.56 \times 10^{-5}$ (after accounting for the look-elsewhere effect), corresponding to a Gaussian-equivalent significance $> 4.20 σ$. We interpret this feature as being generated through the de-excitation of excited electrons in the relativistic hydrogen-like high-atomic-number ions entrained in the GRB jet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_06968 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probable evidence for a transient mega-electron volt emission line in the GRB 221023A Jiang, Lu-Yao Wang, Yun Wei, Yu-Jia Wei, Da-Ming Li, Xiang He, Hao-Ning Ren, Jia Shen, Zhao-Qiang Jin, Zhi-Ping High Energy Astrophysical Phenomena Detection of spectral line in gamma-ray bursts (GRBs) is importance for studying GRB physics, as it provides insights into the composition and physical conditions of the GRB environment. However, progress in detecting X-ray or gamma-ray emission and absorption lines in GRB spectra has been relatively slow, only the narrow emission line feature of about 10 MeV found in GRB 221009A has exhibited a significance exceeding $5 σ$. Here, we report the probable evidence of a narrow emission feature at about 2.1 mega-electron volts (MeV) in the spectrum of GRB 221023A. The highest statistical significance of this feature is observed in the time interval between 8 and 30 seconds after Fermi Gamma-Ray Burst Monitor trigger, with the chance probability value $<2.56 \times 10^{-5}$ (after accounting for the look-elsewhere effect), corresponding to a Gaussian-equivalent significance $> 4.20 σ$. We interpret this feature as being generated through the de-excitation of excited electrons in the relativistic hydrogen-like high-atomic-number ions entrained in the GRB jet. |
| title | Probable evidence for a transient mega-electron volt emission line in the GRB 221023A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.06968 |