论文标题
银河中心帕尔萨克的内部十分之一的接近和中红外观察结果 - 检测到非常接近Sgr〜A*的灯丝的正确运动
Near- and mid-infrared observations in the inner tenth of a parsec of the Galactic center -- Detection of proper motion of a filament very close to Sgr~A*
论文作者
论文摘要
我们使用ESO VLT（Paranal/Chile）仪器Sinfoni和Visir分析了银河中心（GC）的超级质量黑洞Sgr〜a*附近的气体和灰尘发射。 SINFONI H+K数据立方体显示了与相关线图的几个发射线。从这些线中，BR $γ$排放是最突出的发射，似乎是沿南北方向延伸的条形。使用Visir，我们发现与这种丝状发射的尘土飞扬。在这项工作中，我们提供了证据表明，这一特征很可能与小型刺激性相连，并可能受到中央集群中巨星的风或Sgr〜a*的积聚风的影响。为此，我们在2005年至2015年之间共同添加了SINFONI数据。光谱分析揭示了一系列多普勒偏移的发射线。我们还检测到可以在BR $γ$ bar的通道图中研究的团块形状的子结构。此外，我们将近红外（NIR）BR $γ$特征的检测与PAH1中红外（MIR）观测值进行了比较，并发布了226 GHz无线电数据。这些团块显示出约320美元/s的适当动作，与银河中心的其他红外连续体检测到的细丝一致。对于所调查的BR $γ$ -FEATURE的质量为$ 2.5 \，\ times \，10^{ - 5} \，m _ {\ odot} $，显示了与以前的派生质量的类似对象的协议。除了南北BR $γ$ -BAR外，我们还找到了可比的其他东西方面的功能。另外，我们确定了位于Sgr〜a*西部的几个燃气储层，它们可能含有灰尘的物体。
We analyze the gas and dust emission in the immediate vicinity of the supermassive black hole Sgr~A* at the Galactic center (GC) with the ESO VLT (Paranal/Chile) instruments SINFONI and VISIR. The SINFONI H+K data cubes show several emission lines with related line map counterparts. From these lines, the Br$γ$ emission is the most prominent one and appears to be shaped as a bar extending along the North-South direction. With VISIR, we find a dusty counterpart to this filamentary emission. In this work, we present evidence that this feature can be most likely connected to the mini-spiral and potentially influenced by the winds of the massive stars in the central cluster or an accretion wind from Sgr~A*. To this end, we co-add the SINFONI data between 2005 and 2015. The spectroscopic analysis reveals a range of Doppler-shifted emission lines. We also detect substructures in the shape of clumps that can be investigated in the channel maps of the Br$γ$-bar. In addition, we compare the detection of the near-infrared (NIR) Br$γ$ feature to PAH1 mid-infrared (MIR) observations and published 226 GHz radio data. These clumps show a proper motion of about $320$km/s that are consistent with other infrared continuum detected filaments in the Galactic center. Deriving a mass of $2.5\,\times\,10^{-5}\,M_{\odot}$ for the investigated Br$γ$-feature shows an agreement with former derived masses for similar objects. Besides the North-South Br$γ$-bar, we find a comparable additional East-West feature. Also, we identify several gas reservoirs that are located west of Sgr~A* that may harbor dusty objects.
