论文标题
关于三维运动学距离的准确性
On the Accuracy of Three-dimensional Kinematic Distances
论文作者
论文摘要
在过去的十年中，Bessel调查和Vera项目通过使用VLBI技术测量了三角类似物的大约250个巨大的年轻恒星。这些来源在近一半的银河系中追踪螺旋臂。现在需要的是与远离银河中心的恒星准确的距离。在这里，我们通过结合视线速度和适当的动作来得出3D运动学距离估计值来分析解决这一需求的潜力。对于大约10 kpc的太阳的来源，可能会发生明显的系统不确定性，而三角类似物总体上通常是较高的。但是，对于远远超过银河系中心的来源，3D运动距离比三角形视差通常可以实现的3D运动距离更加准确。
Over the past decade, the BeSSeL Survey and the VERA project have measured trigonometric parallaxes to approximately 250 massive, young stars using VLBI techniques. These sources trace spiral arms over nearly half of the Milky Way. What is now needed are accurate distances to such stars which are well past the Galactic center. Here we analyze the potential for addressing this need by combining line-of-sight velocities and proper motions to yield 3D kinematic distance estimates. For sources within about 10 kpc of the Sun, significant systematic uncertainties can occur, and trigonometric parallaxes are generally superior. However, for sources well past the Galactic center, 3D kinematic distances are robust and more accurate than can usually be achieved by trigonometic parallaxes.
