论文标题
摇摆盘 - 在边缘星系的防尘车道中看到的波纹
Wobbly discs -- corrugations seen in the dust lanes of edge-on galaxies
论文作者
论文摘要
我们报告了附近五个边缘圆盘星系的尘埃道中的小尺度弯曲波（也称为波纹）的检测。这种现象，即圆盘中平面弯曲变得波浪形，就像在扭曲中一样，但在较小的规模上，在这里首次在跨碟片上运行的尘埃道中看到。由于它们是在吸收中的，因此必须存在这些特征在这些星系郊区的灰尘盘中。我们使用UNSHARP遮罩增强了这些特征的可见性，在整个圆盘上追踪灰尘中间平面，通过眼睛测量波牙幅度和使用傅立叶分析的波纹波长。发现波纹幅度在70-200 PC的范围内，波长在1-5 kpc之间。在这个有限的样本中，我们发现，对于较低的质量星系，波纹的幅度往往更大，而波纹的波长似乎不取决于宿主星系的质量。进行线性稳定性分析以找出这些灰尘盘的动态状态。根据WKB分析，我们发现大约一半样本的灰尘波纹是稳定的。进一步的分析，在更大的样本上，将有助于增强上述结果。
We report the detection of small scale bending waves, also known as corrugations, in the dust lanes of five nearby edge-on disc galaxies. This phenomenon, where the disc mid-plane bends to become wavy, just as in warps but on a smaller scale, is seen here for the first time, in the dust lanes running across the discs. Because they are seen in absorption, this feature must be present in the dust disc in the outskirts of these galaxies. We enhance the visibility of these features using unsharp masking, trace the dust mid-plane across the disc, measure the corrugation amplitude by eye and the corrugation wavelength using Fourier analysis. The corrugation amplitude is found to be in the range of 70 - 200 pc and the wavelengths lie between 1 - 5 kpc. In this limited sample, we find that the amplitude of the corrugations tends to be larger for lower mass galaxies, whereas the wavelength of corrugation does not seem to depend on the mass of host galaxies. Linear stability analysis is performed to find out the dynamical state of these dust discs. Based on WKB analysis, we find that the dust corrugations in about half of our sample are stable. Further analysis, on a larger sample would be useful to strengthen the above results.
