论文标题
在积聚中看到的低频准周期振荡是否会流动盘对喷射不稳定性的响应?
Are Low-Frequency Quasi-Periodic Oscillations seen in accretion flows the disk response to a jet instability?
论文作者
论文摘要
低频准周期性振荡或LF QPO在BH X射线二进制中无处不在,并在积聚 - 注射过程中提供了强大的限制。尽管到目前为止已经提出了几种模型,但事实证明,没有任何模型可以重现所有观察性约束,并且尚未出现共识。我们的猜想是,磁盘是由一个大规模垂直磁场螺纹的,将其拆分为两个径向区域。在内部喷射磁盘(JED)中,一个近乎平选的场允许驱动强大的自我填充喷气机,而在过渡半径之外,磁盘的磁化太低,并且标准的积聚磁盘(SAD)已解决。在一系列论文中,这种混合JED-SAD磁盘的配置已被证明可以成功地再现大多数多波长(无线电和X射线)观测值,以及与原型源GX 339-4的LFQPO的同意。我们首先分析文献中提供的主要QPO方案:1)在过渡半径下发生的特定过程,2)积聚 - 注射量的不稳定性和3)固体体透明磁盘磁盘预动力。我们回想起他们的主要假设,并阐明了一些严重的理论问题,这些问题质疑重现LF QPO的能力。然后,我们认为这些模型都不能在JED-SAD物理条件下运行。我们最终提出了一种替代方案,其中LF QPO将是磁盘对在磁回忆区附近触发的不稳定性触发的磁盘响应。这种情况可以解释大多数C型QPO现象学,并且与黑洞二进制的全球行为一致。然而,这种非破坏性射流不稳定性的计算仍有待完成。如果在数值上确认了这种不稳定的存在,那么它也可以自然地解释了在各种积聚来源中看到的喷射摇摆现象学。
Low Frequency Quasi-Periodic Oscillations or LF QPOs are ubiquitous in BH X-ray binaries and provide strong constraints on the accretion-ejection processes. Although several models have been proposed so far, none has been proven to reproduce all observational constraints and no consensus has emerged yet. We make the conjecture that disks are threaded by a large scale vertical magnetic field that splits it into two radial zones. In the inner Jet Emitting Disk (JED), a near equipartition field allows to drive powerful self-collimated jets, while beyond a transition radius, the disk magnetization is too low and a Standard Accretion Disk (SAD) is settled. In a series of papers, this hybrid JED-SAD disk configuration has been shown to successfully reproduce most multi-wavelength (radio and X-rays) observations, as well as the concurrence with the LFQPOs for the archetypal source GX 339-4. We first analyze the main QPO scenarios provided in the literature: 1) a specific process occurring at the transition radius, 2) the accretion-ejection instability and 3) the solid-body Lense-Thirring disk precession. We recall their main assumptions and shed light on some severe theoretical issues that question the capability to reproduce LF QPOs. We then argue that none of these models could be operating under the JED-SAD physical conditions. We finally propose an alternative scenario where LF QPOs would be the disk response to an instability triggered in the jets, near a magnetic recollimation zone. Such a situation could account for most Type-C QPO phenomenology and is consistent with the global behavior of black hole binaries. The calculation of this non-destructive jet instability remains however to be done. If the existence of this instability is numerically confirmed, then it could also naturally account for the jet wobbling phenomenology seen in various accreting sources.