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arXiv 2005.09982astro-ph.HE
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窄线塞弗特1星系PG 1448+273中可变超快外流的探测

Detection of a variable ultra-fast outflow in the Narrow Line Seyfert 1 galaxy PG 1448+273

P. Kosec, A. Zoghbi, D. J. Walton, C. Pinto, A. C. Fabian, M. L. Parker, C. S. Reynolds

摘要:

在一些吸积的超大质量黑洞的X射线光谱中,已经检测到高度电离离子的相对论蓝移吸收特征,即所谓的超快流出(UFO)。如果这些特征真的来自加速到光速10%以上的吸积盘风,那么它们的能量预算非常重要,它们可以促进甚至驱动来自活动星系核(AGN)的星系尺度反馈。然而,UFO的光谱特征往往是弱的,由于高电离的流出物质,风的物理性质的推断可以复杂的活动星系核的其他光谱特征,如相对论反射。在这里,我们研究一个高度吸积窄线塞弗特1星系PG 1448+273。我们应用一个自动化的,系统的例行检测在吸积系统的外流,并实现了明确的检测不明飞行物在这个活动星系核。XMM-牛顿天文台在软X射线和硬X射线波段都观测到了UFO的吸收。外流的速度为(26900 ± 600)km/s(~ 0.09 c),电离参数为log(μ g/ erg cm s^-1)=4.03 - 0.08 ^{+0.10},柱密度大于10^23 cm^-2。同时,我们在物体的光谱中检测到弱的暖吸收特征。我们系统的外流搜索表明存在进一步的多相风结构,但考虑到目前的数据质量,我们不能声称有意义的检测。在第二次较短的XMM-牛顿观测中没有发现UFO,这表明在时间上的变化,在其他类似的活动星系核中也观察到了。

英文摘要:

Relativistically blueshifted absorption features of highly ionised ions, the so-called ultra-fast outflows (UFOs), have been detected in the X-ray spectra of a number of accreting supermassive black holes. If these features truly originate from accretion disc winds accelerated to more than 10 per cent of the speed of light, their energy budget is very significant and they can contribute to or even drive galaxy-scale feedback from active galactic nuclei (AGN). However, the UFO spectral features are often weak due to high ionisation of the outflowing material, and the inference of the wind physical properties can be complicated by other spectral features in AGN such as relativistic reflection. Here we study a highly accreting Narrow Line Seyfert 1 galaxy PG 1448+273. We apply an automated, systematic routine for detecting outflows in accreting systems and achieve an unambiguous detection of a UFO in this AGN. The UFO absorption is observed in both soft and hard X-ray bands with the XMM-Newton observatory. The velocity of the outflow is (26900 +- 600) km/s (~0.09c), with an ionisation parameter of log (ξ / erg cm s^-1)=4.03_{-0.08}^{+0.10} and a column density above 10^23 cm^-2. At the same time, we detect weak warm absorption features in the spectrum of the object. Our systematic outflow search suggests the presence of further multi-phase wind structure, but we cannot claim a significant detection considering the present data quality. The UFO is not detected in a second, shorter observation with XMM-Newton, indicating variability in time, observed also in other similar AGN.

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