具有辐射压力的二元AGN模拟揭示了一个新的占空比，并通过“minitori”结构减少了重力扭矩
Binary AGN simulations with radiation pressure reveal a new duty cycle, and a reduction of gravitational torque, through 'minitori' structures
摘要：
我们产生了第一套双活动星系核的辐射流体力学模拟在秒差距尺度分离的尺度模型模拟。我们使用SPH的流体动力学，和光线跟踪计算光学深度和辐射压力从两个活动星系核。我们证实，没有辐射压力，引力矩的符号是敏感的二进制参数，虽然在我们的两个轨道配置的二进制应合并在一个时间尺度为$<10^9$年。然而，辐射压力迅速破坏每个SMBH周围的“minitori”，大大减少了引力矩和吸积，并大大增加了合并的时间尺度。我们的模拟提出了一个新的“minitorus”占空比，时间尺度为~10个双星周期（当将我们的模型缩放到总双星质量为$2\times10^7\,M_\odot$时，为~ $10^6$年）。的增长和井喷阶段的'minitori'是类似的时间尺度，因此，我们预计约有一半的观测到的二进制SMBHs是活跃的，在至少一个组件。“微型”结构提供了可以通过红外干涉测量法观察到的不对称性。
英文摘要：
We produce the first set of radiation hydrodynamics simulations of binary AGNs at parsec-scale separation in scale-model simulations. We use SPH for hydrodynamics, and raytracing to calculate optical depths and radiation pressure from the two AGNs. We confirm that, without radiation pressure, the sign of gravitational torque is sensitive to the binary parameters, although in one of our two orbital configurations the binary should coalesce in a time-scale of $<10^9$ yr. However, radiation pressure quickly destroys the 'minitori' around each SMBH, drastically reducing gravitational torques and accretion, and greatly increasing the coalescence time-scale. Our simulations suggest a new 'minitorus' duty cycle with a time-scale of ~10 binary periods (~$10^6$ yr when scaling our models to a total binary mass of $2\times10^7\,M_\odot$). The growth and blow-out phases of the 'minitori' are of similar time-scales, and thus we expect about half of observed binary SMBHs to be active, in at least one component. The 'minitorus' structure provides asymmetries that could be observed by infrared interferometry.
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