Constraining the parameters of the putative supermassive binary black hole in PG 1302-102 from its radio structure
Constraining the parameters of the putative supermassive binary black hole in PG 1302-102 from its radio structure
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从射电结构中约束 PG 1302-102 中假定的超大质量双黑洞的参数
DOI：
10.1093/mnras/stv2049
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发表时间：
2015
影响因子：
4.8
通讯作者：
L. Gergely
中科院分区：
文献类型：
--
作者：
E. Kun;S. Frey;K. Gabányi;S. Britzen;D. Cseh;L. Gergely
我们研究了类星体PG 1302-102的PC尺度的运动学和KPC尺度的射电形态，根据光学可变性推测，它的中心可能包含一个亚PC分离的超大质量双星黑洞系统。分析了利用甚长基线阵列(VLBA)监测活动星系核喷流的VLBA实验(Mojave)计划在15 GHz、20个历元、历时17年获得的高分辨率射电干涉测量结果，以研究PC尺度的射电结构。利用1.4 GHz和5 GHz的甚大阵列(VLA)获得了档案观测，以研究KPC尺度的形态。我们发现，PC尺度的喷流与视线在~2.2°范围内倾斜，半开口角约为0.2°。从PC尺度射电喷流得到的参数与从PG 1302-102的光学光曲线分析得到的参数定性一致。得到了系统中两个黑洞的质量比至少为0.08。我们发现了KPC尺度上螺旋喷流结构的一些迹象，但内部和扩展射电喷流的方向明显不同，阻碍了PC和KPC尺度喷流在双星情景中的直接联系。
We investigate the pc-scale kinematics and kpc-scale radio morphology of the quasar PG 1302-102, which may harbour a sub-pc separation supermassive binary black hole system at its centre as inferred from optical variability. High-resolution radio interferometric measurements obtained with the Very Long Baseline Array (VLBA) in the Monitoring Of Jets in Active galactic nuclei with VLBA Experiments (MOJAVE) programme at 15 GHz at 20 epochs spanning 17 years were analysed to investigate the pc-scale radio structure. Archival observations with the Very Large Array (VLA) at 1.4 GHz and 5 GHz were obtained to study the kpc-scale morphology. We find that the pc-scale jet is inclined within ~2.2 deg to the line of sight and has a half-opening angle of about 0.2 deg. The parameters derived from the pc-scale radio jet are qualitatively consistent with those obtained from the analysis of the optical light curve of PG 1302-102. We obtain at least 0.08 for the mass ratio of the two black holes in the system. We find some indication for a helical jet structure on kpc-scale, but the directions of the inner and the extended radio jets are significantly different, obstructing a straightforward connection of the pc- and kpc-scale jets within the binary scenario.