MCG-2-58-22的朱雀观测：核周围物质的几何约束
A Suzaku Observation of MCG-2-58-22: Constraining the Geometry of the Circumnuclear Material
摘要：
我们已经分析了活动星系核MCG-2-58-22的朱雀长视，这是一个1.5型塞弗特，在视线中几乎没有X射线吸收，并且具有由环核物质反射产生的突出特征：Fe线和康普顿反射峰。我们对幂律光子指数（Gamma=1.80+/-0.02）、康普顿反射强度（R=0.69+/-0.05）以及Fe K发射线能量质心和宽度（E=6.40+/-0.02keV，v_FWHM < 7100 km/s）施加严格约束。我们没有发现明显的证据，从强电离铁的发射，也没有一个强大的，相对论性增宽的铁线，表明可能没有辐射有效的吸积盘非常接近中央黑洞。此外，我们还测试了Murphy & Yaqoob提出的一种新的自洽物理模型，即“MYTorus”模型，该模型由围绕中央照明源的甜甜圈形状的材料环组成，并产生康普顿峰和Fe K线发射。通过应用这个模型，我们发现观测到的光谱与康普顿厚度的物质环（柱密度NH=3.6（+1.3/-0.8）× 10^24 cm^-2）相一致，它位于原子核的视线之外，使其没有超过银河柱的X射线吸收。我们计算出，这种材料是足够的生产所有的Fe线通量，而不需要任何额外的康普顿薄环核材料的通量贡献。
英文摘要：
We have analyzed a Suzaku long-look of the active galactic nucleus MCG-2-58-22, a type 1.5 Seyfert with very little X-ray absorption in the line of sight and prominent features arising from reflection off circumnuclear material: the Fe line and Compton reflection hump. We place tight constraints on the power law photon index (Gamma=1.80+/-0.02), the Compton reflection strength (R=0.69+/-0.05), and the Fe K emission line energy centroid and width (E=6.40+/-0.02 keV, v_FWHM < 7100 km/s). We find no significant evidence for emission from strongly ionized Fe, nor for a strong, relativistically broadened Fe line, indicating that perhaps there is no radiatively efficient accretion disk very close in to the central black hole. In addition we test a new self-consistent physical model from Murphy & Yaqoob, the "MYTorus" model, consisting of a donut-shaped torus of material surrounding the central illuminating source and producing both the Compton hump and the Fe K line emission. From the application of this model we find that the observed spectrum is consistent with a Compton-thick torus of material (column density NH=3.6(+1.3/-0.8) x 10^24 cm^-2) lying outside of the line of sight to the nucleus, leaving it bare of X-ray absorption in excess of the Galactic column. We calculate that this material is sufficient to produce all of the Fe line flux without the need for any flux contribution from additional Compton-thin circumnuclear material.
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