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| Format: | Preprint |
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2024
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| Online-Zugang: | https://arxiv.org/abs/2408.06312 |
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| _version_ | 1866917969326505984 |
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| author | Zhang, He-Shou Ponti, Gabriele Carretti, Ettore Liu, Ruo-Yu Morris, Mark R. Haverkorn, Marijke Locatelli, Nicola Zheng, Xueying Aharonian, Felix Zhang, Haiming Zhang, Yi Stel, Giovanni Strong, Andrew Yeung, Micheal Merloni, Andrea |
| author_facet | Zhang, He-Shou Ponti, Gabriele Carretti, Ettore Liu, Ruo-Yu Morris, Mark R. Haverkorn, Marijke Locatelli, Nicola Zheng, Xueying Aharonian, Felix Zhang, Haiming Zhang, Yi Stel, Giovanni Strong, Andrew Yeung, Micheal Merloni, Andrea |
| contents | Magnetic halos of galaxies are crucial for understanding galaxy evolution, galactic-scale outflows, and feedback from star formation activity. Identifying the magnetised halo of the Milky Way is challenging because of the potential contamination from foreground emission arising in local spiral arms. Additionally, it is unclear how our magnetic halo is influenced by recently revealed large-scale structures such as the X-ray emitting eROSITA Bubbles. Here we report the identification of several kpc-scale magnetised structures based on their polarized radio emission and their gamma-ray counterparts, which can be interpreted as the radiation of relativistic electrons in the Galactic magnetic halo. These non-thermal structures extend far above and below the Galactic plane and are spatially coincident with the thermal X-ray emission from the eROSITA Bubbles. The morphological consistency of these structures suggests a common origin, which can be sustained by Galactic outflows driven by active star-forming regions located in the Galactic Disc at 3-5 kpc from the Galactic Centre. These results reveal how X-ray-emitting and magnetised halos of spiral galaxies can be related to intense star formation activities and suggest that the X-shaped coherent magnetic structures observed in their halos can stem from galaxy outflows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06312 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A magnetised Galactic halo from inner Galaxy outflows Zhang, He-Shou Ponti, Gabriele Carretti, Ettore Liu, Ruo-Yu Morris, Mark R. Haverkorn, Marijke Locatelli, Nicola Zheng, Xueying Aharonian, Felix Zhang, Haiming Zhang, Yi Stel, Giovanni Strong, Andrew Yeung, Micheal Merloni, Andrea Astrophysics of Galaxies High Energy Astrophysical Phenomena Magnetic halos of galaxies are crucial for understanding galaxy evolution, galactic-scale outflows, and feedback from star formation activity. Identifying the magnetised halo of the Milky Way is challenging because of the potential contamination from foreground emission arising in local spiral arms. Additionally, it is unclear how our magnetic halo is influenced by recently revealed large-scale structures such as the X-ray emitting eROSITA Bubbles. Here we report the identification of several kpc-scale magnetised structures based on their polarized radio emission and their gamma-ray counterparts, which can be interpreted as the radiation of relativistic electrons in the Galactic magnetic halo. These non-thermal structures extend far above and below the Galactic plane and are spatially coincident with the thermal X-ray emission from the eROSITA Bubbles. The morphological consistency of these structures suggests a common origin, which can be sustained by Galactic outflows driven by active star-forming regions located in the Galactic Disc at 3-5 kpc from the Galactic Centre. These results reveal how X-ray-emitting and magnetised halos of spiral galaxies can be related to intense star formation activities and suggest that the X-shaped coherent magnetic structures observed in their halos can stem from galaxy outflows. |
| title | A magnetised Galactic halo from inner Galaxy outflows |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.06312 |