论文标题
带辐射压力的二元AGN模拟揭示了新的占空比，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
论文作者
论文摘要
我们在比例模拟模拟的parsec尺度分离下对二元AGN的第一组辐射流体动力学模拟。我们使用SPH进行流体动力学，并进行射线疗法来计算两个AGN的光学深度和辐射压力。我们确认，在没有辐射压力的情况下，重力扭矩的迹象对二进制参数敏感，尽管在我们的两种轨道构型之一中，二进制应在$ <10^9 $ yr的时间尺度上合并。然而，辐射压力迅速破坏了每个SMBH周围的“ Minitori”，大大减少了重力扭矩和积聚，并大大增加了聚结的时间尺度。我们的模拟建议一个新的“ Minitorus”占空比，其时间尺度为〜10个二进制期（$ 10^6 $ yr时，将我们的型号扩展到总二进制质量为$ 2 \ times10^7 \，m_ \ odot $）。 “ Minitori”的生长和井喷阶段具有相似的时间量表，因此我们预计至少在一个组件中，观察到的二进制SMBH的一半是活跃的。 “ Minitorus”结构提供了不对称的，可以通过红外干涉法观察到。
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.
