Fairall 9“裸”核的XMM-牛顿观点
An XMM-Newton view of the `bare' nucleus of Fairall 9
摘要：
我们提出的光谱结果，从130 ks的观测，从X射线多镜任务牛顿（XMM-牛顿）天文台，I型塞弗特星系费尔9。X射线硬度比分析的光变曲线，揭示了一个'软时亮'的行为，这是典型的无线电安静I型塞弗特星系。此外，我们分析了反射光栅光谱仪的高光谱分辨率数据，我们没有发现任何重要的证据支持在源的光谱的低X射线能量部分中存在暖吸收体。这意味着Fairall 9的中央核心是“干净的”，因此它的X射线光谱特性直接探测了中央引擎的物理条件。在0.5-10 keV的能量范围内，来自EPIC数据的整体X射线光谱，可以通过相对论模糊的光盘反射模型建模。这个光谱模型产生了一个中间黑洞的最佳拟合自旋参数为$α=0.39^{+0.48}_{-0.30}$的Fairall 9。
英文摘要：
We present the spectral results from a 130 ks observation, obtained from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness-ratio analysis of the light-curves, reveals a `softer-when-brighter' behaviour which is typical for radio-quiet type I Seyfert galaxies. Moreover, we analyse the high spectral-resolution data of the reflection grating spectrometer and we did not find any significant evidence supporting the presence of warm-absorber in the low X-ray energy part of the source's spectrum. This means that the central nucleus of Fairall 9 is `clean' and thus its X-ray spectral properties probe directly the physical conditions of the central engine. The overall X-ray spectrum in the 0.5-10 keV energy-range, derived from the EPIC data, can be modelled by a relativistically blurred disc-reflection model. This spectral model yields for Fairall 9 an intermediate black-hole best-fit spin parameter of $α=0.39^{+0.48}_{-0.30}$.
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