使用高斯过程方法搜索六个活动星系核的X射线准周期性
Search for X-ray Quasi-periodicity of six AGNs using Gaussian Process method
AI总结：
本文利用高斯过程模型celerite分析六个疑似活动星系核的长时标X射线光变曲线，仅在RE J1034+396中确认约3600 s的QPO，并推测其源于吸积盘热点。
摘要：
在活动星系核（AGNs）中发现的准周期振荡（QPOs）是一种非常有趣的观测现象，暗示着超大质量黑洞周围存在未知的物理机制。已有数个活动星系核被发现在X射线能段存在QPO现象。本文收集并归算了六个疑似存在QPO的活动星系核的长时间X射线观测数据。研究采用高斯过程（GP）模型celerite拟合光变曲线，并搜索准周期行为。利用最优模型计算了每条光变曲线的功率谱密度和参数后验分布。在六个活动星系核中，仅RE J1034+396被发现具有约3600 s的QPO，其余五个源未表现出QPO调制行为。本文提出吸积盘上的热点可能是导致活动星系核这种准周期行为的物理机制。
英文摘要：
The quasi-periodic oscillations (QPOs) found in active galactic nuclei (AGNs) are a very interesting observational phenomenon implying an unknown physical mechanism around supermassive black holes. Several AGNs have been found to have QPO phenomena in the X-ray energy band. Long-duration X-ray observations were collected and reduced for six AGNs with a suspected QPO. The Gaussian process (GP) model celerite was used to fit the light curves and to search for the quasi-periodicity behavior. The power spectral density and parameter posterior distributions of each light curve were calculated with the optimal model. Of the six AGNs, only RE J1034+396 was found to have a QPO of about 3600 s. The other five sources do not show QPO modulation behavior. We propose that a hot spot on the accretion disk is a possible physical mechanism resulting in this quasi-periodic behavior of AGNs.
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