A Neutron Capture Explanation for the 10 MeV Emission Line Seen in GRB 221009A
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866915220067188736 |
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| author | Zhu, Jiahuan Feng, Hua Liu, Tong |
| author_facet | Zhu, Jiahuan Feng, Hua Liu, Tong |
| contents | The brightest ever gamma-ray burst (GRB) 221009A displays a significant emission line component around 10 MeV. As the GRB central engine is neutron-rich, we propose that the emission line could be originally due to the 2.223 MeV gamma-rays following neutron capture with protons. The measured line profile can be adequately fitted with a neutron capture model that involves thermal broadening and a bulk Doppler shift. The spectral modeling reveals a Doppler factor varying from 5.1 to 2.1 for the neutron-rich component, along with a temperature increase from 300 keV to about 900 keV, during the time interval of 280--360 s since the trigger, with about $10^{-2}$ $M_\odot$ deuteriums produced in the process. We argue that the neutron capture can take place in the outer shell of a structure jet. Disk winds could be another possible site. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_13369 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Neutron Capture Explanation for the 10 MeV Emission Line Seen in GRB 221009A Zhu, Jiahuan Feng, Hua Liu, Tong High Energy Astrophysical Phenomena The brightest ever gamma-ray burst (GRB) 221009A displays a significant emission line component around 10 MeV. As the GRB central engine is neutron-rich, we propose that the emission line could be originally due to the 2.223 MeV gamma-rays following neutron capture with protons. The measured line profile can be adequately fitted with a neutron capture model that involves thermal broadening and a bulk Doppler shift. The spectral modeling reveals a Doppler factor varying from 5.1 to 2.1 for the neutron-rich component, along with a temperature increase from 300 keV to about 900 keV, during the time interval of 280--360 s since the trigger, with about $10^{-2}$ $M_\odot$ deuteriums produced in the process. We argue that the neutron capture can take place in the outer shell of a structure jet. Disk winds could be another possible site. |
| title | A Neutron Capture Explanation for the 10 MeV Emission Line Seen in GRB 221009A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.13369 |