2004年超级耀斑中来自磁星SGR 1806-20的625 Hz QPO的间歇性和寿命作为地壳和地核之间磁耦合的证据
Intermittency and Lifetime of the 625 Hz QPO in the 2004 Hyperflare from the Magnetar SGR 1806-20 as evidence for magnetic coupling between the crust and the core
摘要：
在2004年SGR 1806-20的巨型耀斑中检测到的准周期振荡（QPO）通常被解释为中子星的全球磁弹性振荡。然而，理论模型预测最高频率的振荡应该迅速消失，而观测结果表明最高频率的信号在两个不同航天器的X射线数据中持续了约100秒，两者之间存在很大的差异。这种差异对于约625 Hz的高频QPO尤其重要。然而，以前的分析没有系统地测试信号是否也可以在更短的数据段中存在，与理论预测更一致。在这里，我们测试的存在下，在625赫兹的高频QPO的数据从罗西X射线定时探测器（RXTE）和拉马迪高能太阳光谱成像仪（RHESSI）系统无论是在个别旋转周期的中子星，以及平均在多个连续的旋转周期在同一阶段。我们发现，在RXTE数据中的QPO是一致的，只存在于一个单一的周期，为短的持续时间约0.5秒，而RHESSI数据是一致的，与一个短命的信号出现和消失，与一个长寿的QPO。总的来说，这些数据为地壳和地核之间的强磁相互作用提供了证据。
英文摘要：
Quasi-periodic oscillations (QPOs) detected in the 2004 giant flare from SGR 1806-20 are often interpreted as global magneto-elastic oscillations of the neutron star. There is, however, a large discrepancy between theoretical models, which predict that the highest frequency oscillations should die out rapidly, and the observations, which suggested that the highest-frequency signals persisted for ~100s in X-ray data from two different spacecraft. This discrepancy is particularly important for the high-frequency QPO at ~625 Hz. However, previous analyses did not systematically test whether the signal could also be there in much shorter data segments, more consistent with the theoretical predictions. Here, we test for the presence of the high-frequency QPO at 625 Hz in data from both the Rossi X-ray Timing Explorer (RXTE) and the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) systematically both in individual rotational cycles of the neutron star, as well as averaged over multiple successive rotational cycles at the same phase. We find that the QPO in the RXTE data is consistent with being only present in a single cycle, for a short duration of ~0.5s, whereas the RHESSI data are as consistent with a short-lived signal that appears and disappears as with a long-lived QPO. Taken together, this data provides evidence for strong magnetic interaction between the crust and the core.
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