Microquasars as the major contributors to Galactic cosmic rays around the "knee"
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916984917065728 |
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| author | Kaci, Samy Giacinti, Gwenael Aharonian, Felix Wang, Jie-Shuang |
| author_facet | Kaci, Samy Giacinti, Gwenael Aharonian, Felix Wang, Jie-Shuang |
| contents | Recently, LHAASO detected a gamma-ray emission extending beyond $100\,\rm{TeV}$ from 4 sources associated to powerful microquasars. We propose that such sources are the main Galactic PeVatrons and investigate their contribution to the proton and gamma-ray fluxes by modeling their entire population. We find that the presence of only $\sim10$ active powerful microquasars in the Galaxy at any given time is sufficient to account for the proton flux around the knee and to provide a very good explanation of cosmic-ray and gamma-ray data in a self-consistent picture. The $10\,\rm{TeV}$ bump and the $300\,\rm{TeV}$ hardening in the cosmic-ray spectrum naturally appear, and the diffuse background measured by LHAASO above a few tens of $\rm{TeV}$ is accounted for. This supports the paradigm in which cosmic rays around the knee are predominantly accelerated in a very limited number of powerful microquasars. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_01369 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microquasars as the major contributors to Galactic cosmic rays around the "knee" Kaci, Samy Giacinti, Gwenael Aharonian, Felix Wang, Jie-Shuang High Energy Astrophysical Phenomena Recently, LHAASO detected a gamma-ray emission extending beyond $100\,\rm{TeV}$ from 4 sources associated to powerful microquasars. We propose that such sources are the main Galactic PeVatrons and investigate their contribution to the proton and gamma-ray fluxes by modeling their entire population. We find that the presence of only $\sim10$ active powerful microquasars in the Galaxy at any given time is sufficient to account for the proton flux around the knee and to provide a very good explanation of cosmic-ray and gamma-ray data in a self-consistent picture. The $10\,\rm{TeV}$ bump and the $300\,\rm{TeV}$ hardening in the cosmic-ray spectrum naturally appear, and the diffuse background measured by LHAASO above a few tens of $\rm{TeV}$ is accounted for. This supports the paradigm in which cosmic rays around the knee are predominantly accelerated in a very limited number of powerful microquasars. |
| title | Microquasars as the major contributors to Galactic cosmic rays around the "knee" |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2510.01369 |