用RXTE PCA对SGR 1806-20巨耀斑的贝叶斯定时分析
Bayesian timing analysis of giant flare of SGR 1806-20 by RXTE PCA
摘要：
利用软γ射线中继站（SGR）探测巨耀斑衰变尾部的高频准周期振荡（QPO）并估算其频率，通过与理论预测的本征频率进行比较，可以得到超密物质状态方程（EoS）的有用约束条件。利用2004年12月27日SGR 1806-20的Rossi X射线定时探测器（RXTE/XTE）正比计数器阵列（PCA）收集的数据，应用贝叶斯周期检测方法（Gregory & Loredo，1992）搜索瞬态性质的振荡。除了已经检测到的频率之外，我们还发现了Colaiuda等人（2009）基于f_{QPOs} EoS（Akmal等人，1998）用于SGR 1806-20。
英文摘要：
By detecting high frequency quasi-periodic oscillations (QPOs) and estimating frequencies of them during the decaying tail of giant flares from Soft Gamma-ray Repeaters (SGRs) useful constraints for the equation of state (EoS) of superdense matter may be obtained via comparison with theoretical predictions of eigenfrequencies. We used the data collected by the Rossi X-Ray Timing Explorer (RXTE/XTE) Proportional Counter Array (PCA) of a giant flare of SGR 1806-20 on 2004 Dec 27 and applied a Bayesian periodicity detection method (Gregory & Loredo, 1992) for the search of oscillations of transient nature. In addition to the already detected frequencies, we found a few new frequencies (f_{QPOs} ~ 16.9, 21.4, 36.4, 59.0, 116.3 Hz) of oscillations predicted by Colaiuda et al. (2009) based on the APR_{14} EoS (Akmal et al., 1998) for SGR 1806-20.
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