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arXiv 0907.3464astro-ph.COastro-ph.HE
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窄吸收线类星体的高速外流

High Velocity Outflows in Narrow Absorption Line Quasars

G. Chartas, J. Charlton, M. Eracleous, M. Giustini, P. Rodriguez Hidalgo, R. Ganguly, F. Hamann, T. Misawa, D. Tytler

摘要:

活动星系核现象目前的范例是一个中央引擎,它由以圆盘形式吸积到超大质量黑洞上的物质流入组成。紫外线和光学观测发现高速电离物质从黑洞流出。我们目前的结果从朱雀和XMM-牛顿观测的样本内禀NAL类星体高速流出。我们推导出的X射线吸收体的内禀柱密度值与NAL类星体以比BAL类星体更小的倾角被观察的外流情况是一致的。我们发现,NAL类星体的α_ox和D α_ox的分布与BAL类星体和SDSS射电宁静类星体的α_ox和D α_ox的分布有很大的不同。NAL类星体在X射线波段没有明显的吸收,并且Dalpha_ox的正值表明在UV波段有吸收。本征NAL类星体的正的Dalpha_ox值可以用一种几何方案来解释,即我们对NAL类星体的紧凑X射线热日冕的视线不穿过吸收风,而对它们的紫外辐射吸积盘的视线确实拦截了流出的吸收体。

英文摘要:

The current paradigm for the AGN phenomenon is a central engine that consists of an inflow of material accreting in the form of a disk onto a supermassive black hole. Observations in the UV and optical find high velocity ionized material outflowing from the black hole. We present results from Suzaku and XMM-Newton observations of a sample of intrinsic NAL quasars with high velocity outflows. Our derived values of the intrinsic column densities of the X-ray absorbers are consistent with an outflow scenario in which NAL quasars are viewed at smaller inclination angles than BAL quasars. We find that the distributions of alpha_ox and Dalpha_ox of the NAL quasars of our sample differ significantly from those of BAL quasars and SDSS radio-quiet quasars. The NAL quasars are not significantly absorbed in the X-ray band and the positive values of Dalpha_ox suggest absorption in the UV band. The positive values of Dalpha_ox of the intrinsic NAL quasars can be explained in a geometric scenario where our lines of sight towards the compact X-ray hot coronae of NAL quasars do not traverse the absorbing wind whereas lines of sight towards their UV emitting accretion disks do intercept the outflowing absorbers.

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