Bar-driven spiral waves in disk galaxies
Bar-driven spiral waves in disk galaxies
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DOI：
10.1086/156054
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发表时间：
1978-04
期刊：
影响因子：
--
通讯作者：
J. M. Huntley;R. Sanders;W. Roberts
中科院分区：
文献类型：
--
作者：
J. M. Huntley;R. Sanders;W. Roberts
我们研究了星系引力场中旋转气体盘对棒状扰动的响应。特别是，二维的、时变的数值流体力学计算已经被执行，以确定气体盘对旋转的、棒状扰动的稳态响应。这里考虑了两种类型的棒状扰动：圆盘轴对称引力场中的椭圆畸变和非均质长形球体。计算表明，在没有气体自引力的情况下，一个粘性的、微分旋转的气体盘对旋转的棒状扰动作出反应，形成一个带有两个尾随螺旋波的中心气体棒。气体响应的局部相位主要是圆盘中主共振的数目和间隔的函数。这个结果可以用粒子轨道理论来理解。气体对棒状扰动的响应还取决于棒状的相对强度和有效轴比。这些激波的位置与在许多棒旋星系中观测到的狭长的尘埃带相对应。
We investigate the response of rotating disks of gas to barlike perturbations in galactic gravitational fields. In particular, two-dimensional, time-dependent, numerical hydrodynamical calculations have been performed in order to determine the steady-state response of disks of gas to rotating, barlike perturbations. Two types of barlike perturbations are considered here: oval distortions in the axisymmetric gravitational field of the disk, and heterogeneous prolate spheroids. The calculations reveal that, in the absence of gaseous self-gravity, a viscous, differentially rotating disk of gas responds to a rotating barlike perturbation by forming a central gas bar with two trailing spiral waves. The local phase of the gas response is primarily a function of the number and spacing of the principal resonances in the disk. This result may be understood in terms of particle orbit theory. The gas response to barlike perturbations also depends on the relative strength and the effective axial ratio of the bar. These shocks correspond in position to the long, narrow dust lanes observed in many barred spiral galaxies.