不寻常的活动星系H1821 +643和FRI类星体的难以捉摸的性质
The unusual active galaxy H1821+643 and the elusive nature of FRI quasars
摘要：
对冷核星团H1821+643中心黑洞的中等自旋估计促使完成了关于这个物体的起源和演化的故事，这是自20多年前Blundell和Rawlings的工作以来的第一个大质量黑洞以接近Eddington速率与FRI喷流吸积的例子。这种难以捉摸的特性组合在我们2010年的模型中得到了解释，我们表明它是一个小参数空间的一部分，其中包括X形射电星系。作为一个从未经历过反向旋转阶段的吸积黑洞，H1821+643受到理论的限制，只能在自旋值介于0.1和约0.7之间时产生喷流，在稍小的范围内产生FRI喷流。来自这样一个黑洞的反馈不受倾斜喷流的影响，这就是为什么在这种星团环境中恒星形成率仍然很高。预测H1821+643将在数百万年内变成无喷流。
英文摘要：
The moderate spin estimate for the black hole at the center of the cool core cluster H1821+643 motivates the completion of a story about this object's origin and evolution that was in the making since the work by Blundell and Rawlings over two decades ago as the first example of a massive black hole accreting at near Eddington rates with an FRI jet. This elusive combination of properties was explained in our 2010 model where we showed it to be part of a small parameter space that includes X shaped radio galaxies. As an accreting black hole that never experienced a counterrotating phase, H1821+643 is constrained by theory to produce a jet for spin values between 0.1 and about 0.7 and an FRI jet for a slightly smaller range. The feedback from such a black hole is not subject to a tilted jet and is why star formation rates remain high in this cluster environment. The prediction is that H1821+643 is within millions of years of becoming jetless.
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