论文标题
进动与不稳定性对GRS 1758-258喷射的影响
Effects of precession versus instabilities on the jets of GRS 1758-258
论文作者
论文摘要
目标。原型的微号GRS 1758-258在随着时间的推移中显示了无线电图的大规模形态变化，这归因于不稳定性的兴起。在这里，我们研究了这些效果是否可以归因于喷气进动。方法。我们使用了新的和档案的无线电图来适合运动学喷气序列模型。分析了这样获得的参数的值，以便获得对GRS 1758-258系统物理特性的约束。以前已经研究了它们与喷气疗法的不同理论的一致性，例如次级恒星引起的晶状体效应和潮汐扭矩。另外，我们还评估了观察结果与最终的JET不稳定性兼容的可能性。结果。这里介绍的新无线电数据证实，GRS 1758-258的大规模无线电形态随着时间的流逝而变化。我们的研究表明，可以将18.48天的时间归因于进动，从而暗示重新解释迄今为止对轨道时期的假设。但是，根据我们的分析，观察到的无线电飞机的结构变化不容易归因于喷气序列。相反，不稳定性的增长似乎是对这些影响的更现实的解释。
Aims. The prototypical microquasar GRS 1758-258 exhibits large-scale morphological changes in radio maps over time which have been attributed to the rise of instabilities. Here, we investigate whether these effects could be attributed to jet precession instead. Methods.We used new and archival radio maps to fit a kinematic jet precession model. The value of the parameters thus obtained were analysed in order to get constraints on the physical properties of the GRS 1758-258 system. Their consistency with different theories of the origins for the jet precession, such as Lense-Thirring effect and tidal torques induced by the secondary star, has previously been studied. Alternatively, we also assessed the possibility that observations are compatible with eventual jet instabilities. Results. The new radio data presented here confirm that the large-scale radio morphology of GRS 1758-258 is changing over time. Our study shows that the 18.48 day period could plausibly be ascribed to precession, thus implying a reinterpretation of assumptions made for the orbital period to date. However, the observed structural changes in radio jets cannot be easily attributed to jet precession according to our analysis. In contrast, the growth of instabilities certainly appears to be a more realistic explanation of these effects.
