X-Ray Line Tomography of AGN-induced Motion in Clusters of Galaxies
X-Ray Line Tomography of AGN-induced Motion in Clusters of Galaxies
复制标题
星系团中 AGN 引起的运动的 X 射线线断层扫描
DOI：
10.1086/430732
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Ruszkowski
中科院分区：
文献类型：
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作者：
M. Brüggen;M. Hoeft;M. Ruszkowski
重离子发射谱线的热展宽足够小，使得由于体运动而引起的多普勒频移可以用下一代X射线天文台检测到。这就为研究团内介质中的气体速度提供了可能性。在这里，我们研究的整体运动引起的中央活动星系核（AGN）的Fe XXV复合体周围的发射线的效果。我们模拟了活动星系核引起的气泡在一个现实的宇宙学框架的演变，并研究了由此产生的Fe XXV线轮廓。我们发现，在与AGN反馈的集群，气泡的膨胀和浮力上升引起的运动导致铁发射线，可检测的光谱分辨率为~10 eV的独特功能。这些观测将帮助我们确定存在于气泡中的机械能，从而确定活动星系核的动力学光度。
The thermal broadening of emission lines of heavy ions is small enough such that Doppler shifts due to bulk motions may be detected with the next generation of X-ray observatories. This opens up the possibility of studying gas velocities in the intracluster medium. Here we study the effect of bulk motions induced by a central active galactic nucleus (AGN) on the emission lines around the Fe XXV complex. We have modeled the evolution of AGN-induced bubbles in a realistic cosmological framework and studied the resulting Fe XXV line profiles. We found that in clusters with AGN feedback, motions induced by the inflation of bubbles and their buoyant rise lead to distinct features in the iron emission lines that are detectable with a spectral resolution of ~10 eV. These observations will help us to determine the mechanical energy that resides in the bubbles and thereby the kinetic luminosity of the AGN.