IRAS 18325-5926的光谱可变性和对散射介质几何形状的约束
Spectral variability of IRAS 18325-5926 and constraints on the geometry of the scattering medium
摘要：
我们分析了朱雀和XMM-牛顿数据的高度可变的Seyfert 2，IRAS 18325-5926。源的光谱被很好地建模为被描述为吸收的幂律和二次幂律分量，这是一致的，从轴上扩展的高度电离介质的散射发射的主要成分。我们表明，虽然主要成分变化的时间尺度从$10^{4} - 10^{8}$ s的范围很广，散射发射是可变的时间尺度长于$10^{5}$ s。这意味着散射介质的范围大于$10^{16}$ cm。散射通量与初级通量的比率（$\sim 0.03$）意味着散射介质的柱密度为$\sim 10^{23}$ cm $^{-2}$。我们认为，这样的介质是高度电离的，它必须位于小于$10^{17}$厘米的X射线源。因此，我们将散射区域的位置和范围定位为几个$\times 10^{16}$ cm的$\sim$，平均粒子密度为$\sim 10^{6}$ cm $^{-3}$。我们考虑这些结果的物理解释，并作为一个旁白，我们确认存在一个广泛的铁线发射的{ \it XMM-牛顿}和{ \it朱雀}观测。
英文摘要：
We analyze Suzaku and XMM-Newton data of the highly variable Seyfert 2, IRAS 18325-5926. The spectra of the source are well modeled as a primary component described as an absorbed power law and a secondary power law component which is consistent with being scattered emission from an on-axis extended highly ionized medium. We show that while the primary component varies on a wide range of timescales from $10^{4} - 10^{8}$ s, the scattered emission is variable only on timescales longer than $10^{5}$ s. This implies that the extent of the scattering medium is greater than $10^{16}$ cm. The ratio of the scattered to primary flux ($\sim 0.03$) implies a column density for the scattering medium to be $\sim 10^{23}$ cm$^{-2}$. We argue that for such a medium to be highly ionized it must be located less than $10^{17}$ cm from the X-ray source. Thus we localize the position and extent of scattering region to be $\sim$ a few $\times 10^{16}$ cm, with an average particle density of $\sim 10^{6}$ cm$^{-3}$. We consider the physical interpretation of these results and as an aside, we confirm the presence of a broad Iron line emission in both the {\it XMM-Newton} and {\it Suzaku} observations.
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