The relation between magnetic and gas arms in spiral galaxies
The relation between magnetic and gas arms in spiral galaxies
复制标题
螺旋星系中磁臂和气体臂的关系
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
D. Moss
中科院分区：
文献类型：
--
作者：
D. Moss
在某些螺旋星系的光学旋臂之间看到的臂状磁结构的起源有趣的问题得到解决。使用一个二维近似的非线性圆盘发电机方程，它示出，气体流沿着的武器可能会产生这样的字段配置。另一种可能性是湍流扩散率的螺旋调制，与臂内星际介质中湍流的增强有关。还研究了α效应的类似调制的影响。最后，一个非线性反馈的大尺度场的湍流扩散率（“η-淬火”）的后果进行了简要讨论。
The intriguing question of the origin of the arm-like magnetic structures seen between the optical spiral arms of certain spiral galaxies is addressed. Using a two-dimensional approximation to the non-linear disc dynamo equation, it is shown that gas streaming along the arms may produce such a field configuration. Another possibility is a spiral modulation of the turbulent diffusivity, associated with an enhancement of turbulence in the interstellar medium within the arms. The effects of a similar modulation of the alpha-effect are also examined. Finally, the consequences of a non-linear feedback of the large-scale field on the turbulent diffusivity (‘η-quenching’) are briefly discussed.