对X形射电星系4C +00.58的深钱德拉观测：合并诱导重定向的候选者？
A Deep Chandra Observation of the X-shaped Radio Galaxy 4C +00.58: A Candidate for Merger-induced Reorientation?
摘要：
虽然黑洞自旋轴的快速重定向（持续时间不到几百万年）被认为是X形射电星系（XRG）中翅膀形成的机制，但迄今为止，还没有在任何XRG中发现令人信服的重定向案例。替代机翼形成模型，如流体动力学回流模型的支持，观察到的趋势表明，XRG形成优先与沿周围介质的长轴和机翼沿短轴对齐的射流。在这封信中，我们提出了对4C +00.58的钱德拉深度观测，这是一个奇怪的XRG，其喷流沿短轴方向。通过使用X射线数据与现有的无线电和光学数据，我们估计相关的时间尺度，以评估机翼形成模型。流体动力学模型很难解释长翅膀，而X射线腔（表明沿先前轴的喷流活动）和潜在的恒星壳（表明最近的合并）的存在有利于合并引起的重定向模型。
英文摘要：
Although rapid reorientation of a black hole spin axis (lasting less than a few Myr) has been suggested as a mechanism for the formation of wings in X-shaped radio galaxies (XRGs), to date no convincing case of reorientation has been found in any XRG. Alternative wing formation models such as the hydrodynamic backflow models are supported by observed trends indicating that XRGs form preferentially with jets aligned along the major axis of the surrounding medium and wings along the minor axis. In this Letter, we present a deep Chandra observation of 4C +00.58, an oddball XRG with its jet oriented along the minor axis. By using the X-ray data in tandem with available radio and optical data, we estimate relevant timescales with which to evaluate wing formation models. The hydrodynamic models have difficulty explaining the long wings, whereas the presence of X-ray cavities (suggesting jet activity along a prior axis) and a potential stellar shell (indicating a recent merger) favor a merger-induced reorientation model.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
