论文标题
NGC 4945中的QPO来自档案RXTE数据
A QPO in NGC 4945 from Archival RXTE Data
论文作者
论文摘要
我们报告了在档案NGC 4945中发现了一个约6周的准周期振荡（QPO），该数据由Rossi X射线定时资源管理器（RXTE）卫星观察到。 QPO在积聚磁盘中是一个重要的可观察到的，并且已经在中子星（NS）和黑洞（BH）X射线二进制文件（XRB）中进行了广泛的研究。如果银河系黑洞和超大质量黑洞（SMBH）由一组共同的物理过程控制，则应存在于活性银河核（AGN）中。事实证明，在AGN中寻找QPO的搜索很困难，因为由于质量较高，时间尺度会更长。跨1996年至2011年的RXTE AGN光曲线为寻找低频QPO提供了一个绝佳的机会，也许是独特的机会。我们研究了Seyfert-2 AGN，NGC 4945的533 RXTE观察结果。在2006 - 2007年的一大批观察结果中（194个观察结果，跨度为396天），Lomb-Scargle期间图显示了候选QPO的QPO为0.274 $ $ Hz（周期$ $ 42.2 $ 42.2）。我们使用虚假警报概率（FAP）估计不确定性。我们将在透明的进动期间讨论对此功能的可能识别。
We report the discovery of a ~6-week quasi-periodic oscillation (QPO) in archival NGC 4945 data observed by the Rossi X-ray Timing Explorer (RXTE) satellite. QPOs are an important observable in accretion disks and have been studied extensively in both neutron star (NS) and black hole (BH) X-ray binaries (XRB). QPOs should be present in Active Galactic Nuclei (AGN) if galactic black holes and supermassive black holes (SMBH) are governed by a common set of physical processes. The search for QPOs in AGN has proven difficult because the timescales would be much longer, due to their higher mass. RXTE AGN light curves spanning 1996 to 2011 provide an excellent and perhaps unique opportunity to search for low-frequency QPOs. We investigated the 533 RXTE observations made of the Seyfert-2 AGN, NGC 4945. During a large cluster of observations in 2006-2007 (194 observations, spanning 396 days), the Lomb-Scargle periodogram shows a candidate QPO at 0.274 $μ$Hz (period $\approx$ 42.2 days). We estimate the uncertainties using the False Alarm Probability (FAP). We discuss the possible identification of this feature with the Lense-Thirring precession period.
