Global Magnetic Fields of Galaxies and Models for the Galactic Centers

宇宙和星系的各种剧烈现象主要是由于它们的自引力场、自转场和磁场之间的耦合作用。本课题正是在这一思路的基础上进行的，取得了以下成果.利用IF-天体自转效应对极化射电辐射的影响，我们发现了星系磁场的双对称螺旋（BSS）和轴对称螺旋（ASS）结构。通过引入差动旋转圆盘中磁场的湍流扩散和发电机产生，成功地进行了BSS场的理论再现。根据这些结果，我们预测了盘星系的晕磁场结构，BSS场与螺旋密度波之间的磁引力相互作用，进而发现BSS种子场与大尺度宇宙磁场可能存在的关系.本文对旋转磁化星际气体的帕克不稳定性和吉恩不稳定性的联合效应作了局域分析。我们讨论了巨大的星云和星星形成区附近的星际气体细丝的形成。我们研制了一种在计算机屏幕上显示我们用数值方法获得的天文数据的技术。我们的动机是尽可能地将数字数据可视化，以便我们可以直观地从中学习基本原理。(1)我们对星星形成区的巨分子云和气态细丝的磁流体过程进行了可视化。(2)我们已经建立了银河磁场的鸟瞰图，并预测了银河晕中极向分量的主要存在。

A variety of violent phenomena of the universe and galaxies are due mostly to the coupling among their self-gravity, rotation and magnetic fields. The present research project has been conducted on the basis of this idea, and obtained the following restilts.1. We have found bisymmetric spiral (BSS) and axisymmetric spiral (ASS) configuration of galactic magnetic fields by applying the IF-araday rotation effect on polarized radio emission. A tlieoretical reproduction of the BSS fields is successfully conducted by introducing the turbulent diffusion and dynamo production of magnetic fields in differentially-rotating disks. According to tlie results, we predicted the halo magnetic field structure of disk galaxies, the magneto-gravitaional interaction between the BSS fields and spiral density waves, and then found a relation between the BSS seed-fields and tlie possible existence of large-scale cosmic magnetic fields.2. Local analyses are made for a combined effect of Parker's and Jean's instability of magnetized interstellar gas under rotation. We have discussed tlie formation of giant i-nolectilar clouds, and filaments of interstellar gas in the vicinity of star formation regions.3. We have developed a tecliiiique to display on computer screen the astronomical data that we have obtained numerically. Our motivation is to visualize the digital data so much as possible that we can learn from them intuitively the basic principle. (1) We have visualized tlie hydromagnetic process of the formation of giant molecular clouds and gaseous filaments in star forming regions. (2) We have built a bird's-eye view of galactic magnetic fields and predicted tlie predominant existence of poloidal components in the galactic halo.