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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.19695 |
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| _version_ | 1866911284460519424 |
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| author | Martí, Josep Luque-Escamilla, Pedro Luis |
| author_facet | Martí, Josep Luque-Escamilla, Pedro Luis |
| contents | V4641 Sagittarii (V4641 Sgr) is a unique Galactic microquasar system featuring a stellar-mass black hole accreting matter from a massive companion. One of its intriguing features is the presence of relativistic radio jets almost perpendicular to the observed extended gamma-ray emission, implying significant propagation effects or interactions with the Galactic magnetic field. Here we report observational evidence that the radio jet and the very high-energy (VHE) and ultra high-energy (UHE) gamma-ray emission could be aligned along a common axis, indicating a co-spatial or co-directional origin. This alignment supports a model where synchrotron radio emission, VHE and UHE gamma rays are produced within a single, highly collimated relativistic outflow. Our findings favor scenarios of in-situ particle acceleration up to hundreds of TeV, challenge previous interpretations involving large-scale particle diffusion, and simplify the geometric modeling of the source. This case highlights the potential of V4641 Sgr as a PeVatron candidate within our Galaxy and provides a benchmark for understanding jet composition and magnetic structure in microquasars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_19695 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Alignment of radio jets in the microquasar V4641 Sagittarii with its high-energy structures Martí, Josep Luque-Escamilla, Pedro Luis High Energy Astrophysical Phenomena V4641 Sagittarii (V4641 Sgr) is a unique Galactic microquasar system featuring a stellar-mass black hole accreting matter from a massive companion. One of its intriguing features is the presence of relativistic radio jets almost perpendicular to the observed extended gamma-ray emission, implying significant propagation effects or interactions with the Galactic magnetic field. Here we report observational evidence that the radio jet and the very high-energy (VHE) and ultra high-energy (UHE) gamma-ray emission could be aligned along a common axis, indicating a co-spatial or co-directional origin. This alignment supports a model where synchrotron radio emission, VHE and UHE gamma rays are produced within a single, highly collimated relativistic outflow. Our findings favor scenarios of in-situ particle acceleration up to hundreds of TeV, challenge previous interpretations involving large-scale particle diffusion, and simplify the geometric modeling of the source. This case highlights the potential of V4641 Sgr as a PeVatron candidate within our Galaxy and provides a benchmark for understanding jet composition and magnetic structure in microquasars. |
| title | Alignment of radio jets in the microquasar V4641 Sagittarii with its high-energy structures |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.19695 |