论文标题
NGC 6951中的挖掘过程：射流碰撞的分子盘
Digging process in NGC 6951: the molecular disc bumped by the jet
论文作者
论文摘要
我们介绍了一项研究，该研究是银河系NGC 6951，SAB（RS）BC，这是银河系的活跃双胞胎，距离为24 MPC。它的核与GMOS-IFU的光学观察到了，显示出流出，并在HST/ACS的情况下观察到，揭示了两个具有相似取向的扩展结构，表明存在准直和/或遮盖结构。为了确定这一假设，在双子座北望远镜的NIFS光谱仪中获得了自适应光学辅助NIR积分光谱观测。我们检测到H $ _2 $分子气的紧凑结构，被解释为直径为$ \ sim $ 47 PC，PA = 124 $°$和速度范围从-40到+40 km S $^{ - 1} $的近边缘圆盘。相对于无线电喷射和光学中的电离锥，该光盘被未对准32 $°$。有两个区域的湍流区域，其位置角类似于射流/锥体，在分子和电离相中都可以看到。这些区域连接到分子盘的边缘，并以[n ii]/h $α$ = 5的高比例重合，这表明这些区域令人震惊，激发，部分电离或两者兼而有之。我们解释了这些结构是由于“挖掘过程”在圆盘上施加的“挖掘过程”，从而将分子气体驱射到电离锥上。 17 PC内的动态质量估计为$ 6.3 \ times10^{6} $$ m _ {\ odot} $。这是一个有趣的案例，即对象提供连接的喂养反馈结构的证据。
We present a study of the central 200 pc of the galaxy NGC 6951, SAB(rs)bc, an active twin of the Milky Way, at a distance of 24 Mpc. Its nucleus has been observed in the optical with the GMOS-IFU, showing an outflow, and with the HST/ACS, revealing two extended structures with similar orientation, suggesting the presence of a collimating and/or obscuring structure. In order to ascertain this hypothesis, adaptive optics assisted NIR integral field spectroscopic observations were obtained with the NIFS spectrograph in the Gemini North telescope. We detected a compact structure of H$_2$ molecular gas, interpreted as a nearly edge-on disc with diameter of $\sim$47 pc, PA=124$°$ and velocity range from -40 to +40 km s$^{-1}$. This disc is misaligned by 32$°$ with respect to the radio jet and the ionization cones seen in the optical. There are two regions of turbulent gas, with position angles similar to the jet/cones, seen both in molecular and ionized phases; these regions are connected to the edges of the molecular disc and coincide with a high ratio of [N II]/H$α$=5, suggesting that these regions are shock excited, partially ionized or both. We explain these structures as a consequence of a "digging process" that the jet inflicts on the disc, ejecting the molecular gas towards the ionization cones. The dynamical mass within 17 pc is estimated as $6.3\times10^{6}$$M_{\odot}$. This is an interesting case of an object presenting evidence of a connected feeding-feedback structure.
