论文标题
压实驱动的黑洞生长
Compaction-Driven Black Hole Growth
论文作者
论文摘要
我们使用{newhorizon}宇宙学模拟研究星系进化与中央黑洞（BH）生长之间的相互作用。当深色halo的黄金质量低于$ m _ {\ rm V} \ sim 10^{12} \ rm m_ \ odot $时，BH增长速度很慢。早期抑制主要是由于超新星（SN）反馈在浅势井中的气体去除，这预测$ \ sim 10^5 \ rm m_ \ odot $的BHS倾向于在线性的关系以下，凸出质量。当光环足够大，可以通过其深度势孔和加热的圆与半乳酸培养基（CGM）锁定SN喷射时，允许快速的BH生长。这两个区域之间的BH生长开始是由湿录事件触发的，例如，合并或反向旋转流引起。它带来了将角动量损失到内部$ 1 \ rm kpc $“蓝色金块”中的气体，并在星系结构，运动学和组成特性（包括星形式淬灭的发作）中引起重大过渡。压实事件仅限于SN反馈和热CGM的相同机制局限于黄金质量。由于电位孔的加深和相关的动力摩擦，BH生长的发作与其对中心的下沉有关。因此，星系金质量被印记为快速BH增长的阈值，从而使AGN反馈保持了CGM的热量并保持长期淬火。 AGN反馈不会引起淬火的发作；它们都是由SN和热CGM区域之间的压实事件引起的。
We study the interplay between galaxy evolution and central black-hole (BH) growth using the {NewHorizon} cosmological simulation. BH growth is slow when the dark-matter halo is below a golden mass of $M_{\rm v} \sim 10^{12} \rm M_\odot$, and rapid above it. The early suppression is primarily due to gas removal by supernova (SN) feedback in the shallow potential well, predicting that BHs of $\sim 10^5 \rm M_\odot$ tend to lie below the linear relation with bulge mass. Rapid BH growth is allowed when the halo is massive enough to lock in the SN ejecta by its deep potential well and its heated circum-galactic medium (CGM). The onset of BH growth between these two zones is triggered by a wet-compaction event, caused, e.g., by mergers or counter-rotating streams. It brings gas that lost angular momentum into the inner-$1\rm kpc$ "blue nugget" and causes major transitions in the galaxy structural, kinematic and compositional properties, including the onset of star-formation quenching. The compaction events are confined to the golden mass by the same mechanisms of SN feedback and hot CGM. The onset of BH growth is associated with its sinkage to the center due to the compaction-driven deepening of the potential well and the associated dynamical friction. The galaxy golden mass is thus imprinted as a threshold for rapid BH growth, allowing the AGN feedback to keep the CGM hot and maintain long-term quenching. AGN feedback is not causing the onset of quenching; they are both caused by a compaction event when the mass is between the SN and hot-CGM zones.
