论文标题
检测狭窄线seyfert 1 Galaxy PG 1448+273中可变的超快速流出的检测
Detection of a variable ultra-fast outflow in the Narrow Line Seyfert 1 galaxy PG 1448+273
论文作者
论文摘要
高度离子离子，所谓的超快速流出（UFOS）的相对性蓝光吸收特征已在许多增强超级质量黑洞的X射线光谱中被检测到。如果这些特征真正起源于积聚圆盘的风，超过光速的10％以上，它们的能量预算非常重要，并且可以促进甚至驱动来自Active Galactic Nuclei（AGN）的星系尺度反馈。但是，由于流出的材料的高电离，不明飞行物的光谱特征通常很弱，而风理特性的推断可能会因AGN中的其他光谱特征（例如相对论反射）而变得复杂。在这里，我们研究了高度积聚的窄线Seyfert 1 Galaxy Pg 1448+273。我们应用自动化的系统例程来检测积聚系统中的流出，并在此AGN中实现对不明飞行物的明确检测。在具有XMM-Newton天文台的软X射线带和硬X射线带中观察到UFO吸收。流出的速度为（26900 +-600）km / s（〜0.09c），具有log的电离参数（ξ / eRG cm s^-1）= 4.03 _ { - 0.08}^{ +0.10}，列中高于10^23 cm^-2。同时，我们检测到物体光谱中的弱温暖吸收特征。我们的系统流出搜索表明存在进一步的多相风结构，但是考虑到当前的数据质量，我们不能要求大量检测。在XMM-Newton的第二个较短的观察结果中未检测到UFO，这表明在其他类似的AGN中也观察到了时间的变化。
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.
