Kinematics of the H2O masers at the centre of the planetary nebula K3–35
Kinematics of the H2O masers at the centre of the planetary nebula K3–35
复制标题
行星状星云 K3-35 中心 H2O 脉泽的运动学
DOI：
10.1111/j.1365-2966.2008.13815.x
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发表时间：
2008
影响因子：
4.8
通讯作者：
L. F. Miranda
中科院分区：
文献类型：
--
作者：
L. Uscanga;Y. G'omez;A. Raga;J. Cant'o;G. Anglada;J. F. G'omez;J. Torrelles;L. F. Miranda
我们已经研究了位于行星状星云(PN)K3-35中心的水脉泽的运动学，使用了以前的甚大阵列(VLA)观测数据。根据我们的运动学模型，通过对脉泽点的空间分布和视线速度的分析，我们可以在位置-速度图中识别出旋转和膨胀环的典型图案。我们发现脉泽的分布与追踪半径为�0.021弧秒(�100-Au)的圆形环是相容的，其相对于视线的倾角为55◦。我们得到了S−1的膨胀速度为1.4公里，自转速度为3.1公里。在位置角(PA)�158◦的天空平面上投射的环的方向几乎与K3-35中观测到的喷流最内侧区域的方向垂直，这表明可能与外流的准直有关的圆盘或环面的存在。
We have studied the kinematics traced by the water masers located at the centre of the planetary nebula (PN) K3–35, using data from previous Very Large Array (VLA) observations. An analysis of the spatial distribution and line-of-sight velocities of the maser spots allows us to identify typical patterns of a rotating and expanding ring in the position–velocity diagrams, according to our kinematical model. We find that the distribution of the masers is compatible with tracing a circular ring with a � 0.021-arcsec (� 100-au) radius, observed with an inclination angle of 55 ◦ with respect to the line of sight. We derive expansion and rotation velocities of 1.4 and 3.1 km s −1 , respectively. The orientation of the ring, projected on the plane of the sky, at position angle (PA) � 158 ◦ , is almost orthogonal to the direction of the innermost region of the jet observed in K3–35, suggesting the presence of a disc or torus that may be related to the collimation of the outflow.