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arXiv 1504.02232astro-ph.GA
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关于星系棒中尘埃带的形态

On the morphology of dust lanes in galactic bars

L. Sánchez-Menguiano, I. Pérez, A. Zurita, I. Martínez-Valpuesta, J. A. L. Aguerri, S. F. Sánchez, S. Comerón, S. Díaz-García

摘要:

我们的研究的目的是使用动力学模拟,探讨两个重要的动力学酒吧参数,酒吧的强度和酒吧模式的速度,对酒吧尘埃带的形状的影响。为了量化尘埃带的形状,我们开发了一种新的系统方法来测量尘埃带的曲率。以前的数值模拟比较了酒吧尘埃带的曲率与酒吧的强度,预测两个参数之间的关系,这已被观测研究所支持,但与一个大的蔓延。我们考虑到酒吧模式的速度,探索,同时,这两个参数的尘埃带形状的效果。为此,我们分开我们的银河酒吧快酒吧$\left(1 < \mathcal{R} < 1.4 \right)$和慢酒吧$\left(\mathcal{R} > 1.4 \right)$,获得,如以前的模拟,尘埃带曲率和酒吧的快速酒吧的强度之间的反比关系。第一次,我们将研究扩展到慢酒吧,找到一个恒定的曲率作为酒吧强度的函数。因此,我们得出结论,弱酒吧直尘埃带的候选人慢酒吧。最后,我们分析了一个试点样本的10个S $^4$ G星系,得到的尘埃带曲率范围内的模拟。

英文摘要:

The aim of our study is to use dynamical simulations to explore the influence of two important dynamical bar parameters, bar strength and bar pattern speed, on the shape of the bar dust lanes. To quantify the shape of the dust lanes we have developed a new systematic method to measure the dust lane curvature. Previous numerical simulations have compared the curvature of bar dust lanes with the bar strength, predicting a relation between both parameters which has been supported by observational studies but with a large spread. We take into account the bar pattern speed to explore, simultaneously, the effect of both parameters on the dust lane shape. To that end, we separate our galactic bars in fast bars $\left(1 < \mathcal{R} < 1.4 \right)$ and slow bars $\left(\mathcal{R} > 1.4 \right)$, obtaining, as previous simulations, an inverse relation between the dust lane curvature and the bar strength for fast bars. For the first time, we extend the study to slow bars, finding a constant curvature as a function of the bar strength. As a result, we conclude that weak bars with straight dust lanes are candidates for slow bars. Finally, we have analysed a pilot sample of ten S$^4$G galaxies, obtaining dust lane curvatures lying within the range covered by the simulations.

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