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arXiv 2004.03824astro-ph.HE
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NGC 3227的XMM-牛顿+ NuSTAR大系列观测的X射线变率分析

X-ray variability analysis of a large series of XMM-Newton + NuSTAR observations of NGC 3227

A. P. Lobban, T. J. Turner, J. N. Reeves, V. Braito, L. Miller

摘要:

我们提出了一系列的X射线可变性的结果,从一个长期的XMM牛顿+ NuSTAR活动的明亮,可变AGN NGC 3227。我们提出了一个分析的光变曲线,显示的源显示典型的软时,更明亮的行为,虽然也经历了显着的光谱硬化在一个观察过程中,我们解释为由于掩星事件云的吸收气体。我们频谱分解的数据,并表明,大部分的变化是连续驱动的,通过均方根变化分析,强烈增强软带。我们发现,源在很大程度上符合线性均方根通量行为,我们计算X射线功率谱,检测中度的证据弯曲的功率谱,符合现有的比例关系。此外,我们计算X射线傅立叶时间滞后使用XMM-牛顿和-通过最大似然法- NuSTAR数据,揭示了一个强大的低频硬滞后和软滞后在较高的频率,我们讨论的混响模型方面的证据。

英文摘要:

We present a series of X-ray variability results from a long XMM-Newton + NuSTAR campaign on the bright, variable AGN NGC 3227. We present an analysis of the lightcurves, showing that the source displays typically softer-when-brighter behaviour, although also undergoes significant spectral hardening during one observation which we interpret as due to an occultation event by a cloud of absorbing gas. We spectrally decompose the data and show that the bulk of the variability is continuum-driven and, through rms variability analysis, strongly enhanced in the soft band. We show that the source largely conforms to linear rms-flux behaviour and we compute X-ray power spectra, detecting moderate evidence for a bend in the power spectrum, consistent with existing scaling relations. Additionally, we compute X-ray Fourier time lags using both the XMM-Newton and - through maximum-likelihood methods - NuSTAR data, revealing a strong low-frequency hard lag and evidence for a soft lag at higher frequencies, which we discuss in terms of reverberation models.

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