标题： 室女座A中的偏振与运动学 显示英文标题

标题： Polarization and kinematics in Cygnus A

摘要： 通过对天鹅座A的光学光谱偏振测量，我们得出结论，赛夫特星系天鹅座A中的电离锥内的散射介质正在以170±34公里/秒的速度向外运动，而且所需的动量可以由平均类星体的辐射压力提供。这样一个过程能够产生类似于观测到的电离锥的结构，这些电离锥被认为是由核周尘埃环的遮挡效应造成的。我们在来自天鹅座A中心千秒差距处的 [O III] 发射线中检测到了一个极化的红翼。这个红翼与在宽线区边界的附近产生的发射线一致。 显示英文摘要

摘要： From optical spectropolarimetry of Cygnus A we conclude that the scattering medium in the ionization cones in Cygnus A is moving outward at a speed of 170+-34 km/s, and that the required momentum can be supplied by the radiation pressure of an average quasar. Such a process could produce a structure resembling the observed ionization cones, which are thought to result from shadowing by a circumnuclear dust torus. We detect a polarized red wing in the [O III] emission lines arising from the central kiloparsec of Cygnus A. This wing is consistent with line emission created close to the boundary of the broad-line region.