Seed magnetic Fields Generated by Primordial Supernova Explosions
Seed magnetic Fields Generated by Primordial Supernova Explosions
复制标题
原始超新星爆炸产生的种子磁场
DOI：
10.1046/j.1365-8711.1998.02041.x
复制
发表时间：
1998
影响因子：
4.8
通讯作者：
R. Opher
中科院分区：
文献类型：
--
作者：
O. D. Miranda;M. Opher;R. Opher
星系磁场的起源是天体物理学中的一个悬而未决的问题。一般而言，已经提出了与通过发电机机构放大的小种子田的生成相关的几种机制。一般来说，这些机制难以同时满足足够高的磁场强度和必要的大相干尺度的要求。我们证明，在米兰达和奥弗（1996，1997）形成宇宙大尺度结构的多次爆炸场景中，致密和湍流的物质壳的形成，可以自然地充当产生磁场的种子。在第三族天体的塌陷和爆炸过程中，自然会建立与密度梯度不平行的温度梯度，通过比尔曼电池机制产生种子磁场。我们表明，在这种多次爆炸场景中，可以在星系团数量级（相干长度 L � 1.8Mpc）的尺度上产生 � 10 12 10 14 G 的种子磁场，在尺度上可产生高达 � 4.5 × 10 10 G 的种子磁场
The origin of the magnetic field in galaxies is an open question in astrophysics. Several mechanisms have been proposed related, in general, with the generation of small seed fields amplified by a dynamo mechanism. In general, these mechanisms have difficulty in satisfying both the requirements of a suffici ently high strength for the magnetic field and the necessary large coherent scales. We show that the formation of dense and turbulent shells of matter, in the multiple explosion scenario of Miranda and Opher (1996, 1997) for the formation of the large-scale structures of the Universe, can naturally act as a seed for the generation of a magnetic field. During the collapse and explosion of Population III objects, a temperature gradient not parallel to a density gradient can naturally be established, producing a seed magnetic field through the Biermann battery mechanism. We show that seed magnetic fields � 10 12 10 14 G can be produced in this multiple explosion scenario on scales of the order of clusters of galaxies (with coherence length L � 1.8Mpc) and up to � 4.5 × 10 10 G on scales