On the acceleration of cosmic rays at the post-adiabatic shocks of supernova remnants
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914558842503168 |
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| author | Petruk, O. Bandiera, R. Kuzyo, T. Brose, R. Ingallinera, A. |
| author_facet | Petruk, O. Bandiera, R. Kuzyo, T. Brose, R. Ingallinera, A. |
| contents | When a supernova remnant (SNR) interacts with the dense material of an interstellar cloud, its shock wave decelerates rapidly, and the post-shock temperature drops to levels that permit efficient cooling of the shocked plasma. At this stage, the shock enters the post-adiabatic phase of its evolution. During this phase, the internal structure of the SNR undergoes significant changes, particularly in the immediate post-shock region, at spatial scales relevant to cosmic ray acceleration. Once the shock enters the post-adiabatic regime, the efficiency of diffusive shock acceleration increases due to a higher plasma compression, to a change in the direction of the advection velocity, and to an increased rate of momentum gain. As a result, the momentum spectrum of relativistic particles hardens, deviating from a pure power law at high energies. Particles could reach higher maximum values compared to classical predictions. We highlight the dynamics of post-adiabatic flows in SNRs, study their impact on particle acceleration, and present supporting observational evidence in the radio band. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21988 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the acceleration of cosmic rays at the post-adiabatic shocks of supernova remnants Petruk, O. Bandiera, R. Kuzyo, T. Brose, R. Ingallinera, A. High Energy Astrophysical Phenomena When a supernova remnant (SNR) interacts with the dense material of an interstellar cloud, its shock wave decelerates rapidly, and the post-shock temperature drops to levels that permit efficient cooling of the shocked plasma. At this stage, the shock enters the post-adiabatic phase of its evolution. During this phase, the internal structure of the SNR undergoes significant changes, particularly in the immediate post-shock region, at spatial scales relevant to cosmic ray acceleration. Once the shock enters the post-adiabatic regime, the efficiency of diffusive shock acceleration increases due to a higher plasma compression, to a change in the direction of the advection velocity, and to an increased rate of momentum gain. As a result, the momentum spectrum of relativistic particles hardens, deviating from a pure power law at high energies. Particles could reach higher maximum values compared to classical predictions. We highlight the dynamics of post-adiabatic flows in SNRs, study their impact on particle acceleration, and present supporting observational evidence in the radio band. |
| title | On the acceleration of cosmic rays at the post-adiabatic shocks of supernova remnants |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2510.21988 |