X形射电星系：探究喷流演化、周围介质动力学及其复杂的相互联系
X-Shaped Radio Galaxies: Probing Jet Evolution, Ambient Medium Dynamics, and Their Intricate Interconnection
AI总结：
本文综述X形射电星系的多频观测与形成机制，指出最大样本证据不支持单一普适模型，并提出未来应针对不同源约束具体模型。
摘要：
本综述探讨了X形射电星系（XRGs）领域，这是带翼射电源的一个独特子类，其特征是存在两对喷流瓣，它们以显著角度排列，形成反演对称结构。这些瓣包含活动（主）阶段和被动（次）阶段，在多个频段上表现出多样性质，这给识别其形成机制带来了挑战。已提出的机制大致可分为两类：一类与喷流在其中传播的三轴周围介质有关，另一类与产生喷流的复杂中央活动星系核（AGN）机制有关。在迄今最大规模样本中发现的XRG观测特征，对存在一个产生各个XRG源的普适过程这一观点提出了挑战。相反，观测和数值结果反而表明不存在普适模型，并推断不同源可能涉及不同机制。通过仔细审视显著且令人困惑的性质，本综述旨在为未来研究提出潜在方向，以约束和收紧适用于XRG的各个模型。
英文摘要：
This review explores the field of X-shaped radio galaxies (XRGs), a distinctive subset of winged radio sources that are identified by two pairs of jetted lobes which aligned by a significant angle, resulting in an inversion-symmetric structure. These lobes, encompassing active (primary) and passive (secondary) phases, exhibit a diverse range of properties across the multiple frequency bands, posing challenges in discerning their formation mechanism. The proposed mechanisms can broadly be categorized into those related either to a triaxial ambient medium, into which the jet propagates, or to a complex, central AGN mechanism, where the jet is generated. The observed characteristics of XRGs as discovered in the most substantial sample to date, challenge the idea that there is universal process at work that produces the individual sources of XRGs. Instead, the observational and numerical results rather imply the absence of an universal model and infer that distinct mechanisms may be at play for the specific sources. By scrutinizing salient and confounding properties, this review intends to propose the potential direction for future research to constrain and constrict individual models applicable to XRGs.
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。
