原始等离子体在病毒冲击下的宏观磁化

IF 5.9 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-08 DOI:10.1088/1475-7516/2025/10/042

Uri Keshet and Kuan-Chou Hou

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引用次数: 0

摘要

我们表明，星系团维里（即结构-形成吸积）激波观测，特别是同步辐射，意味着宏观磁化强度为> 1%，下游为> 1016德拜长度的层，挑战了高阿尔夫夫 -马赫碰撞-无激波模型。与超新星遗迹中的类似激波或γ射线爆发余辉中的相对论性激波不同，在这些激波中，宏观磁化层归因于预先存在的或非共振的宇宙射线流种子子结构，而病毒激波上游既弱磁化又原始。因此，必须有某种机制从吸积的原始等离子体中产生宏观子结构，并且可能同样支配其他高马赫数激波系统。

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Macroscopic magnetization of primordial plasma by virial shocks

We show that galaxy-cluster virial (i.e., structure-formation accretion) shock observations, in particular of synchrotron emission, imply ≳ 1% magnetization of a macroscopic, ≳ 1016 Debye-length layer downstream, challenging high Alfvén-Mach collisionless-shock modelling. Unlike similar shocks in supernova remnants or relativistic shocks in γ-ray burst afterglows, where macroscopic magnetized layers were attributed to preexisting or non-resonant cosmic-ray streaming-seeded substructure, virial shock upstreams are both weakly magnetized and pristine. Hence, some mechanism must generate macroscopic sub-structure out of the accreted primordial plasma, and may similarly dominate additional high-Mach shock systems.

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来源期刊

Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理

CiteScore

10.20

自引率

23.40%

发文量

632

审稿时长

1 months

期刊介绍： Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.