论文标题
在无线电频率下的自我纵向超级二进制黑洞：Spikey的故事继续
A self-lensing supermassive binary black hole at radio frequencies: the story of Spikey continues
论文作者
论文摘要
最近建议使用千摩尔赛克分离二进制超级质量黑洞（SMBH），基于对其高质量Kepler光学光曲线建模狭窄的尖峰，因此Quasar J1918+4937最近提议携带Milliparsec分离二进制超级质量黑洞（SMBH）。已知的二进制SMBH极为罕见，对该对象的物理和几何参数的紧密约束是唯一的。用很长的基线干涉法获得的J1918+4937的高分辨率无线电图像表明，延伸至80 milliarcseconds的丰富单方面射流结构。在这里，我们分析了J1918+4937的快照8.4/8.7-GHz VLBI图像，同时分析了敏感的1.7和5-GHz档案VLBI图像，并表明Wigggled Jet的外观与二进制场景一致。我们开发了处理偏心轨道的喷气结构模型。通过将此模型应用于测量的VLBI组件位置，我们限制了无线电射流的倾斜度以及射流发射器SMBH的旋转角度。我们发现喷气形态模型与光学和无线电数据一致，并且次级SMBH很可能是系统中的喷射速度。此外，可用于J1918+4937的十年长的15 GHz无线电通量密度监测数据兼容，与由于自旋轨道倾向引起的射流倾斜度缓慢而导致的总通量密度逐渐降低。如果次级SMBH的地平线迅速旋转，J1918+4937可能是有效的高能中微子来源。
The quasar J1918+4937 was recently suggested to harbour a milliparsec-separation binary supermassive black hole (SMBH), based upon modeling the narrow spike in its high-cadence Kepler optical light curve. Known binary SMBHs are extremely rare, and the tight constraints on the physical and geometric parameters of this object are unique. The high-resolution radio images of J1918+4937 obtained with very long baseline interferometry (VLBI) indicate a rich one-sided jet structure extending to 80 milliarcseconds. Here we analyse simultaneously-made sensitive 1.7- and 5-GHz archive VLBI images as well as snapshot 8.4/8.7-GHz VLBI images of J1918+4937, and show that the appearance of the wiggled jet is consistent with the binary scenario. We develop a jet structural model that handles eccentric orbits. By applying this model to the measured VLBI component positions, we constrain the inclination of the radio jet, as well as the spin angle of the jet emitter SMBH. We find the jet morphological model is consistent with the optical and radio data, and that the secondary SMBH is most likely the jetted one in the system. Furthermore, the decade-long 15-GHz radio flux density monitoring data available for J1918+4937 are compatible with a gradual overall decrease in the the total flux density caused by a slow secular change of the jet inclination due to the spin-orbit precession. J1918+4937 could be an efficient high-energy neutrino source if the horizon of the secondary SMBH is rapidly rotating.
