大质量慢旋喷流对星系团中脂肪泡的影响
Inflating Fat Bubbles in Clusters of Galaxies by Precessing Massive Slow Jets
摘要：
我们进行了流体动力学数值模拟，发现进动的大质量慢射流可以膨胀脂肪泡，即，或多或少的球形气泡，附着在星系团的中心。为了使一个大气泡膨胀，喷射流必须快速旋进。旋进角$θ$应该大，或者在大范围$ 0 \le θ\le θ_{\max} \sim 30-70 ^\circ$内变化（也取决于其它参数），其中$θ=0$是对称轴。对速度和质量流出速率的约束类似于宽射流使脂肪气泡膨胀的约束。速度应为$v_j \sim 10^4 \kms$，两股射流的质量损失率应为$ 2 \dot M_j \simeq 1-50 \dot M_\odot \yr^{-1} $。这些结果，以及我们以前的论文中关于慢宽喷流的结果，支持了这样一种说法，即在冷却流团和星系形成的过程中，大部分反馈加热是由慢大质量喷流完成的。
英文摘要：
We conduct hydrodynamical numerical simulations and find that precessing massive slow jets can inflate fat bubbles, i.e., more or less spherical bubbles, that are attached to the center of clusters of galaxies. To inflate a fat bubble the jet should precess fast. The precessing angle $θ$ should be large, or change over a large range $ 0 \le θ\le θ_{\max} \sim 30-70 ^\circ$ (depending also on other parameters), where $θ=0$ is the symmetry axis. The constraints on the velocity and mass outflow rate are similar to those on wide jets to inflate fat bubbles. The velocity should be $v_j \sim 10^4 \kms$, and the mass loss rate of the two jets should be $ 2 \dot M_j \simeq 1-50 \dot M_\odot \yr^{-1} $. These results, and our results from a previous paper dealing with slow wide jets, support the claim that a large fraction of the feedback heating in cooling flow clusters and in the processes of galaxy formation is done by slow massive jets.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
