Interplay between Escaping Cosmic Rays and Interstellar Medium: Driving of Galactic Winds and Shaping the Local Proton Spectrum
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| Format: | Preprint |
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2025
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| _version_ | 1866910104188616704 |
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| author | Shimoda, Jiro Asano, Katsuaki Inutsuka, Shu-ichiro |
| author_facet | Shimoda, Jiro Asano, Katsuaki Inutsuka, Shu-ichiro |
| contents | We study the effects of escaping cosmic rays (CRs) on the interstellar medium (ISM) around their source with spherically symmetric CR-hydrodynamical simulations taking into account the evolution of the CR energy spectrum, radiative cooling, and thermal conduction. We show how the escaping CRs accelerate and heat the ISM depending on the CR diffusion coefficient. The CR heating effects are potentially responsible for the recent observations of the unexpected H$α$ and [OIII]$\lambda5007$ lines in old supernova remnants. The implied gas outflow rate by CRs can be comparable to the Galactic star formation rate, compatible with the Galactic wind required for polluting the halo gas with metals. Assuming a locally suppressed CR diffusion and a few nearby CR sources in the Local Bubble, we also propose alternative interpretations for the Galactic CR proton spectrum around the Earth measured with CALET, AMS02, and Voyager 1. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_07239 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interplay between Escaping Cosmic Rays and Interstellar Medium: Driving of Galactic Winds and Shaping the Local Proton Spectrum Shimoda, Jiro Asano, Katsuaki Inutsuka, Shu-ichiro High Energy Astrophysical Phenomena Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics We study the effects of escaping cosmic rays (CRs) on the interstellar medium (ISM) around their source with spherically symmetric CR-hydrodynamical simulations taking into account the evolution of the CR energy spectrum, radiative cooling, and thermal conduction. We show how the escaping CRs accelerate and heat the ISM depending on the CR diffusion coefficient. The CR heating effects are potentially responsible for the recent observations of the unexpected H$α$ and [OIII]$\lambda5007$ lines in old supernova remnants. The implied gas outflow rate by CRs can be comparable to the Galactic star formation rate, compatible with the Galactic wind required for polluting the halo gas with metals. Assuming a locally suppressed CR diffusion and a few nearby CR sources in the Local Bubble, we also propose alternative interpretations for the Galactic CR proton spectrum around the Earth measured with CALET, AMS02, and Voyager 1. |
| title | Interplay between Escaping Cosmic Rays and Interstellar Medium: Driving of Galactic Winds and Shaping the Local Proton Spectrum |
| topic | High Energy Astrophysical Phenomena Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.07239 |