A Leptonic Interpretation of the UHE Gamma-ray Emission from V4641 Sgr
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866908683107041280 |
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| author | Wan, Su-Yu Wang, Jie-shuang Liu, Ruo-Yu |
| author_facet | Wan, Su-Yu Wang, Jie-shuang Liu, Ruo-Yu |
| contents | Recently, the microquasar V4641 Sgr and its surrounding is detected at TeV-PeV gamma-ray band. Interestingly, the spectrum follows a power-law function continuing up to 0.8 PeV as reported by LHAASO, and the morphology of the emission appears a puzzling elongated structure. In this work, we propose that the elongated UHE emission from V4641 Sgr could originate from the inverse Compton radiation of electrons with a very hard spectrum, which may result from shear acceleration mechanism in the jets driven by V4641 Sgr. We also calculate the corresponding X-ray synchrotron emission from the same electron population, predicting the potential range of non-thermal X-ray flux of the source. The recent observation by XRISM toward the central part of the UHE source could pose a constraint on the model parameters. In the future, a full coverage of the source by sensitive X-ray instrument and high-resolution TeV-PeV gamma-ray instrument may provide a critical test of the model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02763 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Leptonic Interpretation of the UHE Gamma-ray Emission from V4641 Sgr Wan, Su-Yu Wang, Jie-shuang Liu, Ruo-Yu High Energy Astrophysical Phenomena Recently, the microquasar V4641 Sgr and its surrounding is detected at TeV-PeV gamma-ray band. Interestingly, the spectrum follows a power-law function continuing up to 0.8 PeV as reported by LHAASO, and the morphology of the emission appears a puzzling elongated structure. In this work, we propose that the elongated UHE emission from V4641 Sgr could originate from the inverse Compton radiation of electrons with a very hard spectrum, which may result from shear acceleration mechanism in the jets driven by V4641 Sgr. We also calculate the corresponding X-ray synchrotron emission from the same electron population, predicting the potential range of non-thermal X-ray flux of the source. The recent observation by XRISM toward the central part of the UHE source could pose a constraint on the model parameters. In the future, a full coverage of the source by sensitive X-ray instrument and high-resolution TeV-PeV gamma-ray instrument may provide a critical test of the model. |
| title | A Leptonic Interpretation of the UHE Gamma-ray Emission from V4641 Sgr |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.02763 |