I apply the jittering jets in a cooling flow scenario to explain the two pairs of bubbles in the cooling flow galaxy cluster RBS 797 which are perpendicular to each other and almost coeval, and conclude that the interaction of the jets with the cold dense clumps that feed the supermassive black hole (SMBH) takes place in the zone where the gravitational influence of the SMBH and that of the cluster are about equal. According to the jittering jets in a cooling flow scenario, jets uplift and entrain cold and dense clumps, impart the clumps’ velocity perpendicular to the original jets’ direction, and `drop’ them closer to the jets’ axis. The angular momentum of these clumps is at a very high angle compared to the original jets’ axis. When these clumps feed the SMBH in the next outburst (jet-launching episode) the new jets’ axis might be at a high angle to the axis of the first pair of jets. I apply this scenario to recent observations that show the two perpendicular pairs of bubbles in RBS 797 have a small age difference of <10 $\mathrm{Myr}$, and conclude that the jets–clumps interaction takes place at a distance of about ≈10–100 $\mathrm{pc}$ from the SMBH. Interestingly, in this zone, the escape velocity from the SMBH is about equal to the sound speed of the intracluster medium (ICM). I mention two other clusters of galaxies and discuss the implications of this finding.

中文翻译：

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通过冷却流中的负角动量反馈抖动射流

我在冷却流场景中应用抖动射流来解释冷却流星系团 RBS 797 中的两对气泡，它们彼此垂直且几乎同时存在，并得出结论，射流与喂食的冷致密团块的相互作用超大质量黑洞 (SMBH) 发生在 SMBH 的引力影响与星团的引力影响大致相等的区域。根据冷却流场景中的抖动射流，射流抬升并夹带冷且致密的团块，使团块的速度垂直于原始射流的方向，并将它们“下降”到更靠近射流轴的位置。与原始喷流轴相比，这些团块的角动量处于非常高的角度。当这些团块在下一次爆发（喷气机发射事件）中为 SMBH 提供食物时，新喷气机的轴线可能与第一对喷气机的轴线成高角度。我将这种情况应用到最近的观察中，显示 RBS 797 中的两对垂直气泡的年龄差异小于 10$\mathrm{迈尔}$，并得出结论，射流-团块相互作用发生在大约 ≈10-100$\mathrm{个人电脑}$来自 SMBH。有趣的是，在这个区域，SMBH 的逃逸速度大约等于簇内介质（ICM）的声速。我提到了另外两个星系团，并讨论了这一发现的含义。