银河系中心薄尘埃丝的第一自行
First proper motions of thin dust filaments at the Galactic Center
摘要：
内容：银河系中心的L '波段（3.8微米）图像显示，在迷你螺旋中有大量的细丝，位于迷你空腔的西部，沿着北臂的内缘。此外，我们还发现了与恒星相关的类似特征。目的：我们提出了第一个自行测量的薄尘埃丝观察到的中央秒差距周围SgrA* 和调查可能的机制，可能是负责所观察到的运动。方法：在ESO VLT使用NACO自适应光学系统进行观察。将图像转换到公共坐标系，提取感兴趣的特征。然后，可以执行互相关技术，以便确定特征之间相对于它们在参考历元中的位置的偏移。结果：得到了SgrA* 附近的一些暗条和2个彗星状尘埃源的自行。我们证明了在SgrA* 位置的超大质量黑洞的势场中，暗条的形状和运动与气体的纯开普勒运动不一致.因此，它们的形成和运动必须由另外的机制来负责。我们认为，灯丝的属性可能与流出的磁盘周围的SgrA* 年轻的质量损失的恒星。在某种程度上，外流可能来自黑洞本身。我们还提出了一些证据和理论上的考虑，外流可能是准直的。
英文摘要：
Context: L'-band (3.8 micron) images of the Galactic Center show a large number of thin filaments in the mini-spiral, located west of the mini-cavity and along the inner edge of the Northern Arm. One possible mechanism that could produce such structures is the interaction of a central wind with the mini-spiral. Additionally, we identify similar features that appear to be associated with stars. Aims: We present the first proper motion measurements of the thin dust filaments observed in the central parsec around SgrA* and investigate possible mechanisms that could be responsible for the observed motions. Methods: The observations have been carried out using the NACO adaptive optics system at the ESO VLT. The images have been transformed to a common coordinate system and features of interest were extracted. Then a cross-correlation technique could be performed in order to determine the offsets between the features with respect to their position in the reference epoch. Results: We derive the proper motions of a number of filaments and 2 cometary shaped dusty sources close (in projection) to SgrA*. We show that the shape and the motion of the filaments does not agree with a purely Keplerian motion of the gas in the potential of the supermassive black hole at the position of SgrA*. Therefore, additional mechanisms must be responsible for their formation and motion. We argue that the properties of the filaments are probably related to an outflow from the disk of young mass-losing stars around SgrA*. In part, the outflow may originate from the black hole itself. We also present some evidence and theoretical considerations that the outflow may be collimated.
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