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arXiv 0704.3772astro-ph
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类星体外流中的加速和子结构约束

Acceleration and Substructure Constraints in a Quasar Outflow

Patrick B. Hall, Sarah I. Sadavoy, Damien Hutsemekers, John E. Everett, Alireza Rafiee

摘要:

我们目前的观测可能的视线加速的广泛的吸收槽的C IV类星体SDSS J024221.87+004912.6。我们还讨论了如何在同一对象中的两个其他流出系统的速度重叠约束的流出的属性。在每个系统中的Si IV双峰有一个未混合的过渡和一个过渡与其他系统的吸收重叠。重叠槽中的剩余通量与未混合槽中的剩余通量的乘积很好地拟合。对于这些光学厚系统产生这样的结果,其中至少有一个必须由单独的子单元,而不是一个单一的结构与速度依赖的源覆盖。如果这些子单元是相同的、不透明的球形云,我们估计云的半径为r = 3.9 × 10 ^15 cm。如果它们是完全相同的、不透明的线状细丝,我们估计它们的宽度为w = 6.5 × 10^14 cm。观察到这些子单元覆盖类星体的Mg II宽发射线区域,在该区域距离黑洞的上述灯丝宽度等于薄吸积盘的外大气的预测标度高度。尽管这种高度尺度是源自吸积盘的结构的自然尺度,但这些观测结果证明了吸积盘可能是类星体吸收系统的来源。基于ESO项目075.B-0190(A)的数据。

英文摘要:

We present observations of probable line-of-sight acceleration of a broad absorption trough of C IV in the quasar SDSS J024221.87+004912.6. We also discuss how the velocity overlap of two other outflowing systems in the same object constrains the properties of the outflows. The Si IV doublet in each system has one unblended transition and one transition which overlaps with absorption from the other system. The residual flux in the overlapping trough is well fit by the product of the residual fluxes in the unblended troughs. For these optically thick systems to yield such a result, at least one of them must consist of individual subunits rather than being a single structure with velocity-dependent coverage of the source. If these subunits are identical, opaque, spherical clouds, we estimate the cloud radius to be r = 3.9 10^15 cm. If they are identical, opaque, linear filaments, we estimate their width to be w = 6.5 10^14 cm. These subunits are observed to cover the Mg II broad emission line region of the quasar, at which distance from the black hole the above filament width is equal to the predicted scale height of the outer atmosphere of a thin accretion disk. Insofar as that scale height is a natural size scale for structures originating in an accretion disk, these observations are evidence that the accretion disk can be a source of quasar absorption systems. Based on data from ESO program 075.B-0190(A).

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