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arXiv 1401.4486astro-ph.HE
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z = 1.51 AGN HS 0810+2554超快流出的磁图

Magnified Views of the Ultrafast Outflow of the z = 1.51 AGN HS 0810+2554

G. Chartas, F. Hamann, M. Eracleous, T. Misawa, M. Cappi, M. Giustini, J. C. Charlton, M. Marvin

摘要:

我们提出的结果从引力透镜z=1.51窄吸收线AGN HS 0810+2554与钱德拉X射线天文台进行的观测。HS 0810+2554的透镜放大倍数约为100倍,使该光源格外明亮。在约7.7 keV和约11.0 keV的静止框架能量下检测到吸收线,显著性>97%。通过将这些线解释为由高度电离的铁产生,对应于这些线的X射线吸收气体的隐含流出速度分别为0.13 c和0.41 c。这些相对论性外流的存在和没有任何显著的低能X射线吸收表明,HS 0810+2554中产生相对论性X射线吸收风不需要保护气体。VLT/UVES紫外光谱观测表明,在v_UV ~0.065c处有紫外吸收物质流出。我们的分析表明HS 0810+2554以动能的形式释放到IGM中的总辐射热能量的分数为K_k = 1.0(-0.6,+0.8)。大于1的效率意味着磁驱动可能是这种X射线吸收风加速的重要贡献者。我们还估计最强吸收分量的质量流出率为Mdot_abs=1.1(-0.7,+0.9)M_solar yr^-1。假设在NAL活动星系核HS 0810+2554中探测到的高能外流是大多数活动星系核的共同特性,这将表明X射线吸收风可能具有比以前认为的更大的张角。这对于估计X射线吸收风对周围IGM的反馈贡献具有重要意义。

英文摘要:

We present results from an observation of the gravitationally lensed z=1.51 narrow absorption line AGN HS 0810+2554 performed with the Chandra X-ray Observatory. The factor of ~100 lensing magnification of HS 0810+2554 makes this source exceptionally bright. Absorption lines are detected at rest-frame energies of ~ 7.7 keV and ~11.0 keV at >97% significance. By interpreting these lines to arise from highly ionized iron the implied outflow velocities of the X-ray absorbing gas corresponding to these lines are 0.13c and 0.41c, respectively. The presence of these relativistic outflows and the absence of any significant low-energy X-ray absorption suggest that a shielding gas is not required for the generation of the relativistic X-ray absorbing winds in HS 0810+2554. UV spectroscopic observations with VLT/UVES indicate that the UV absorbing material is outflowing at v_UV ~0.065c. Our analysis indicates that the fraction of the total bolometric energy released by HS 0810+2554 into the IGM in the form of kinetic energy is epsilon_k = 1.0(-0.6,+0.8). An efficiency of greater than unity implies that magnetic driving is likely a significant contributor to the acceleration of this X-ray absorbing wind. We also estimate the mass-outflow rate of the strongest absorption component to be Mdot_abs=1.1(-0.7,+0.9) M_solar yr^-1. Assuming that the energetic outflow detected in the NAL AGN HS 0810+2554 is a common property of most AGN it would suggest that the X-ray absorbing wind may have a larger opening angle than previously thought. This has important consequences for estimating the feedback contribution of X-ray absorbing winds to the surrounding IGM.

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