论文标题
来自小尺度爆发的紧凑型二进制QPO在内部磁盘中
QPOs in compact binaries from small scale eruptions in an inner magnetized disk
论文作者
论文摘要
矮人（DNE）和低质量X射线二进制（LMXB）是紧凑型二进制文件，显示时间尺度的变化，从岁月到秒。在这里，我们专注于解释DNE的一部分快速波动，遵循有关使用由外部标准磁盘和内部磁化磁盘组成的混合磁盘的最新研究框架。我们表明，导致DNE每月爆发的电离不稳定性也能够在内部磁化磁盘中运行。鉴于内部磁化磁盘的低密度和快速积聚时间尺度，电离不稳定性会在内磁盘中来回传播小的，快速的加热和冷却前部。这导致准周期振荡（QPO）的订单为$ 1000 $ s。对我们模型的一个强烈预测是，这些QPO只能在静止或爆发的开始/结束时发展。我们建议这些快速的波动可能解释了已经观察到的QPO的子类以及a（仍在观察LMXBS中的QPOS）的亚类。我们还推断了辐射压力不稳定性可能与LMXBS中的B QPO有关的可能性。
Dwarf novæ (DNe) and low mass X-ray binaries (LMXBs) are compact binaries showing variability on time scales from years to less than seconds. Here, we focus on explaining part of the rapid fluctuations in DNe, following the framework of recent studies on the monthly eruptions of DNe that use a hybrid disk composed of an outer standard disk and an inner magnetized disk. We show that the ionization instability, that is responsible for the monthly eruptions of DNe, is also able to operate in the inner magnetized disk. Given the low density and the fast accretion time scale of the inner magnetized disk, the ionization instability generates small, rapid heating and cooling fronts propagating back and forth in the inner disk. This leads to quasi-periodic oscillations (QPOs) with a period of the order of $1000$ s. A strong prediction of our model is that these QPOs can only develop in quiescence or at the beginning/end of an outburst. We propose that these rapid fluctuations might explain a subclass of already observed QPOs in DNe as well as a, still to observe, subclass of QPOs in LMXBs. We also extrapolate to the possibility that the radiation pressure instability might be related to Type B QPOs in LMXBs.
