Ton S180的X射线发射的反射贡献研究
Investigating the reflection contribution to the X-ray emission of Ton S180
摘要：
现在有越来越多的证据表明，软X射线过剩几乎是无处不在的未被遮蔽的活动星系。尽管在过去的几年中已经考虑了各种解释，但这一最重要的光谱特征的性质尚未得到确定。在这种情况下，我们审查从反射的角度来看，三个最高质量的X射线观测的窄线塞弗特1星系Tonantzintla S180，获得XMM牛顿和朱雀。Ton S 180的X射线谱在几年的时间跨度内只显示出适度的变化，这表明相同的物理过程在不同的时期占了宽带X射线发射的大部分，并且X射线源的属性是相当稳定的。我们已经成功地应用在我们的光谱分析的双反射镜模型，由两个独立的组件：一个来自表面的吸积盘，是高度电离和相对论效应模糊;另一个是冷的，相当微弱，可以与一个遥远的后处理器。由于其软过量发射的强度和接近幂律的形状，Ton S180是测试X射线反射场景的最具挑战性的源之一。在这项工作中，我们提供了一个清晰的说明模糊反射模型的巨大潜力和光谱的灵活性，同时讨论了他们目前的一些限制和可能的缺点。
英文摘要：
There is now growing evidence that the soft X-ray excess is almost ubiquitous among unobscured active galaxies. In spite of the various interpretations that have been considered in the last years, the nature of this foremost spectral feature is not firmly established yet. In this context, we review from a reflection perspective the three highest-quality X-ray observations of the narrow-line Seyfert 1 galaxy Tonantzintla S180, obtained by XMM-Newton and Suzaku. The X-ray spectrum of Ton S180 shows only moderate variations over a time span of several years, suggesting that the same physical process accounts for the bulk of the broad-band X-ray emission at the different epochs, and that the properties of the X-ray source are fairly stable. We have successfully applied in our spectral analysis a dual-reflector model, consisting of two separate components: one arises from the surface of the accretion disc, is highly ionized and blurred by relativistic effects; the other is cold, quite faint, and can be associated with a distant reprocessor. Due to the strength and the nearly power-law shape of its soft excess emission, Ton S180 is one of the most challenging sources to test the X-ray reflection scenario. In this work we provide a clear illustration of the great potential and spectral flexibility of blurred reflection models, while discussing some of their current limitations and possible shortcomings.
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