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arXiv 2007.14704astro-ph.HEastro-ph.GA
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重新观测NLS1星系RE J1034 +396。II。软X射线过剩、QPO及其与GRS 1915+105类比的新认识

Re-observing the NLS1 Galaxy RE J1034+396. II. New Insights on the Soft X-ray Excess, QPO and the Analogy with GRS 1915+105

Chichuan Jin, Chris Done, Martin Ward

摘要:

活动星系核RE J1034+396显示了迄今为止观测到的最显著的X射线准周期振荡。我们进行了详细的频谱时序分析,我们最近同时XMM牛顿,NuSTAR和雨燕观测。我们提出了QPO的频率,均方根,相干性和相位滞后的能量依赖性,并将它们与时间平均谱一起建模。我们的研究表明,需要四个组件来拟合所有的光谱。这些组件包括一个内盘组件(diskbb)、两个暖电晕组件(CompTT-1和CompTT-2)和一个热电晕组件(nthComp)。我们发现,diskbb,CompTT-2(较热,但不太明亮的组件)和nthComp都包含QPO信号,而CompTT-1只表现出随机变化。通过对延迟谱的拟合,我们发现盘状体的QPO比CompTT-2提前679 s,CompTT-2比nthComp提前180 s。通过仅改变归一化,这些组件也可以产生良好的拟合的时间平均和变异性光谱从以前的观察时,QPO存在和不存在。我们的多波长研究表明,QPO的可探测性不依赖于同期的质量吸积率。我们没有检测到明显的铁Kα发射线,或任何明显的反射峰。最后,我们表明,均方根和滞后谱在最新的观测是非常相似的67 Hz QPO中观察到的微类星体GRS 1915+105。这些新的结果支持这两个来源之间的物理类比。我们推测,QPO在这两个来源是由于膨胀/收缩的垂直结构的内部磁盘。

英文摘要:

The active galactic nucleus (AGN) RE J1034+396 displays the most significant X-ray Quasi-Periodic Oscillation (QPO) detected so far. We perform a detailed spectral-timing analysis of our recent simultaneous XMM-Newton, NuSTAR and Swift observations. We present the energy dependence of the QPO's frequency, rms, coherence and phase lag, and model them together with the time-averaged spectra. Our study shows that four components are required to fit all the spectra. These components include an inner disc component (diskbb), two warm corona components (CompTT-1 and CompTT-2), and a hot corona component (nthComp). We find that diskbb, CompTT-2 (the hotter but less luminous component) and nthComp all contain the QPO signal, while CompTT-1 only exhibits stochastic variability. By fitting the lag spectrum, we find that the QPO in diskbb leads CompTT-2 by 679 s, and CompTT-2 leads nthComp by 180 s. By only varying the normalizations, these components can also produce good fits to the time-averaged and variability spectra obtained from previous observations when QPOs were present and absent. Our multi-wavelength study shows that the detectability of the QPO does not depend on the contemporaneous mass accretion rate. We do not detect a significant Iron Kα emission line, or any significant reflection hump. Finally, we show that the rms and lag spectra in the latest observation are very similar to the 67 Hz QPO observed in the micro-quasar GRS 1915+105. These new results support the physical analogy between these two sources. We speculate that the QPO in both sources is due to the expansion/contraction of the vertical structure in the inner disc.

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