Enhancement of Feedback Efficiency by Active Galactic Nucleus Outflows via the Magnetic Tension Force in the Inhomogeneous Interstellar Medium
Enhancement of Feedback Efficiency by Active Galactic Nucleus Outflows via the Magnetic Tension Force in the Inhomogeneous Interstellar Medium
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DOI：
10.3847/1538-4357/aa6c5f
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Y. Asahina;Mariko Nomura;K. Ohsuga
中科院分区：
文献类型：
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作者：
Y. Asahina;Mariko Nomura;K. Ohsuga
通过对亚相对论喷流和盘风在磁化非均匀星际介质（ISM）中的三维磁流体动力学模拟，研究了磁场对活动星系核反馈的影响。我们的模拟表明，磁张力促进了致密气体云的加速，因为磁力线最初是直的，在气体云周围弯曲。在喷射模式中，云的速度色散随着初始磁场的增加而增加。云动能的增加与初始磁场成正比，表明磁张力增加了射流到气体云的能量转换效率。通过对温和准直盘风和漏斗形盘风的模拟，我们证实了即使通过盘风注入能量，也会出现磁场对能量转换效率的提高。在被磁化的非均匀物质被吹走的地方，磁性张力会增强磁化ISM致密部分的加速度。
By performing three-dimensional magnetohydrodynamics simulations of subrelativistic jets and disk winds propagating into the magnetized inhomogeneous interstellar medium (ISM), we investigate the magnetic effects on the active galactic nucleus feedback. Our simulations reveal that the magnetic tension force promotes the acceleration of the dense gas clouds, since the magnetic field lines, which are initially straight, bend around the gas clouds. In the jet models, the velocity dispersion of the clouds increases with an increase in the initial magnetic fields. The increment of the kinetic energy of the clouds is proportional to the initial magnetic fields, implying that the magnetic tension force increases the energy conversion efficiency from the jet to the gas clouds. Through simulations of the mildly collimated disk wind and the funnel-shaped disk wind, we confirm that such an enhancement of the energy conversion efficiency via the magnetic fields appears even if the energy is injected via the disk winds. The enhancement of the acceleration of the dense part of the magnetized ISM via the magnetic tension force will occur wherever the magnetized inhomogeneous matter is blown away.