Departamento de Física, Escuela Politécnica Superior de Jaén, Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071, Jaén, Spain.
Departamento de Ingeniería Mecánica y Minera, Escuela Politécnica Superior de Jaén, Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071, Jaén, Spain.
Nat Commun. 2017 Nov 24;8(1):1757. doi: 10.1038/s41467-017-01976-5.
A subclass of extragalactic radio sources known as winged radio galaxies has puzzled astronomers for many years. The wing features are detected at radio wavelengths as low-surface-brightness radio lobes that are clearly misaligned with respect to the main lobe axis. Different models compete to account for these peculiar structures. Here, we report observational evidence that the parsec-scale radio jets in the Galactic microquasar GRS 1758-258 give rise to a Z-shaped radio emission strongly reminiscent of the X and Z-shaped morphologies found in winged radio galaxies. This is the first time that such extended emission features are observed in a microquasar, providing a new analogy for its extragalactic relatives. From our observations, we can clearly favour the hydrodynamic backflow interpretation against other possible wing formation scenarios. Assuming that physical processes are similar, we can extrapolate this conclusion and suggest that this mechanism could also be at work in many extragalactic cases.
一类被称为翼状射电星系的河外射电源亚类多年来一直令天文学家困惑。在射电波段，可以探测到翼状特征，表现为低表面亮度的射电瓣，它们与主瓣轴明显不对齐。不同的模型竞相解释这些奇特的结构。在这里，我们报告观测证据表明，在银河系微类星体 GRS 1758-258 中的皮秒尺度射电喷流产生了强烈类似于在翼状射电星系中发现的 X 和 Z 形状形态的 Z 形射电发射。这是首次在微类星体中观察到这种扩展的发射特征，为其河外亲属提供了新的类比。从我们的观测中，我们可以清楚地支持对回流的流体动力学解释，而不是其他可能的翼形成情景。假设物理过程是相似的，我们可以推断这个结论，并表明这个机制也可能在许多河外天体中起作用。
