The luminous, hard state can’t be MAD
The luminous, hard state can’t be MAD
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发光的硬态不可能是疯狂的
DOI：
10.1093/mnrasl/slad099
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发表时间：
2023
影响因子：
--
通讯作者：
Middleton, Matthew
中科院分区：
文献类型：
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作者：
Fragile, P. Chris;Chatterjee, Koushik;Ingram, Adam;Middleton, Matthew
我们提出了一个简单的论点，为什么发光，硬态的黑洞X射线双星（BHXRBs）不能总是与磁吸积盘（MAD）。它依赖于三个核心前提：（1）C型准周期振荡（QPO）最好用倾斜的内部热流的Lense-Thirring（LT）进动来解释;（2）观测到的光学和红外（IR）QPO具有与C型QPO相同或更低的频率，这表明喷流在这些系统中也必须进动;（3）MADs的数值模拟表明，它们的强磁场促进了盘与黑洞的对准，从而抑制了LT进动。如果这三个前提都成立，那么，至少在光学和IR QPO与C型QPO一起观察时，这些系统不可能处于MAD状态。进一步扩展这个论点，如果C型QPO总是与LT岁差相关，那么它将在任何时候看到这种定时特征时排除MAD，这几乎涵盖了所有BHXRB处于发光，硬和硬中间状态时的情况。
We present a straightforward argument for why the luminous, hard state of black hole X-ray binaries (BHXRBs) cannot always be associated with a magnetically arrested accretion disc (MAD). It relies on three core premises: (1) that the type-C quasi-periodic oscillation (QPO) is best explained by Lense–Thirring (LT) precession of a tilted, inner, hot flow; (2) that observed optical and infrared (IR) QPOs with the same or lower frequency as the type-C QPO suggest the jet, too, must precess in these systems; and (3) that numerical simulations of MADs show that their strong magnetic fields promote alignment of the disc with the black hole and, thereby, suppress LT precession. If all three premises hold true, then, at least whenever the optical and IR QPOs are observed alongside the type-C QPO, these systems cannot be in the MAD state. Extending the argument further, if the type-C QPO is always associated with LT precession, then it would rule out MADs anytime this timing feature is seen, which covers nearly all BHXRBs when they are in the luminous, hard and hard-intermediate states.