Abstract

Transonic (with Mach number \(M_{s}\gtrsim 1\)) motion of a pulsar relative to the external medium can help its compact pulsar wind nebula develop a double-torus X-ray morphology. The double-torus structure can reverberate as a whole under the dynamic pressure of the external flow. For a flow aligned with the symmetry axis of the nebula, the response of the double-torus is uniform in azimuth. For a misaligned flow, the leeward sides of the tori respond with some delay relative to their windward sides. The delay can cause a curious swaying in the short midsection of the leeward jet of the compact X-ray nebula. Within the framework of the relativistic magnetohydrodynamical model of a pulsar wind nebula we study the dynamics of the nebular outflows contributing to the swaying of the jet. When applied to the Vela X-ray nebula, the model allows us to naturally relate two distinct phenomena, the swaying of the bright midsection of the Vela lee jet and the reverberation of its double-torus.

中文翻译：

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船帆座脉冲星风星云的混响

摘要

脉冲星相对于外部介质的跨音速（马赫数\(M_{s}\gtrsim 1\)）运动可以帮助其致密的脉冲星风星云形成双环面X射线形态。双环面结构在外流动压作用下可以整体产生回响。对于与星云对称轴对齐的流，双环面的响应在方位角上是均匀的。对于未对准的流动，环面的背风侧相对于其迎风侧响应有一些延迟。这种延迟可能会导致致密 X 射线星云背风喷流的短中部发生奇怪的摆动。在脉冲星风星云相对论磁流体动力学模型的框架内，我们研究了导致喷流摇摆的星云流出动力学。当应用于船帆座 X 射线星云时，该模型使我们能够自然地将两种不同的现象联系起来，船帆背风喷流明亮中部的摇摆和双环面的混响。