Macroscopic magnetization of primordial plasma by virial shocks
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914136141594624 |
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| author | Keshet, Uri Hou, Kuan-Chou |
| author_facet | Keshet, Uri Hou, Kuan-Chou |
| contents | Galaxy-cluster virial (structure-formation accretion) shock observations are shown to imply $\gtrsim1\%$ magnetization of a layer extending $\gtrsim10^{16}$ Debye lengths downstream, challenging the modelling of high Alfvén-Mach collisionless shocks. Unlike similar shocks in supernova remnants or relativistic shocks in $γ$-ray burst afterglows, where macroscopic magnetized layers were detected but purportedly attributed to preexisting or non-resonant cosmic-ray streaming-seeded substructure, the upstream of strong virial shocks is both weakly magnetized and pristine. Hence, some mechanism must generate large-scale and possibly self-similar magnetic sub-structure out of the accreted primordial plasma; such a mechanism may dominate other high-Mach shock systems, too. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03645 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Macroscopic magnetization of primordial plasma by virial shocks Keshet, Uri Hou, Kuan-Chou High Energy Astrophysical Phenomena Plasma Physics Galaxy-cluster virial (structure-formation accretion) shock observations are shown to imply $\gtrsim1\%$ magnetization of a layer extending $\gtrsim10^{16}$ Debye lengths downstream, challenging the modelling of high Alfvén-Mach collisionless shocks. Unlike similar shocks in supernova remnants or relativistic shocks in $γ$-ray burst afterglows, where macroscopic magnetized layers were detected but purportedly attributed to preexisting or non-resonant cosmic-ray streaming-seeded substructure, the upstream of strong virial shocks is both weakly magnetized and pristine. Hence, some mechanism must generate large-scale and possibly self-similar magnetic sub-structure out of the accreted primordial plasma; such a mechanism may dominate other high-Mach shock systems, too. |
| title | Macroscopic magnetization of primordial plasma by virial shocks |
| topic | High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2412.03645 |