论文标题
相对论多普勒促进场景中超级二进制黑洞候选pg1302-102的广泛区域配置PG1302-102
Broad-line region configuration of the supermassive binary black hole candidate PG1302-102 in the relativistic Doppler boosting scenario
论文作者
论文摘要
根据其光学和紫外光度法的周期性变化，PG1302-102被认为是一种超质量的二进制黑洞（BBH）系统，这可以解释为被解释为由于其二级黑洞（BH）模式的相对论多普勒的磁盘的相对论多普勒的促进。在本文中，我们使用IUE，Galex和Hubble获得的存档紫外光谱研究了PG1302-102的几条宽发射线，以揭示该BBH系统在多普勒增强方案下的宽线区域（BLR）发射特性。我们发现，宽线$α$，NV，CIV和CIII]均显示高斯概况，这些线没有显示出明显的周期性变化。我们采用了一个简单的BLR模型，我们对这些宽线进行了马尔可夫链蒙特卡洛配件，并发现必须以$ \ sim33^{\ circ} $的方向角度查看BLR，接近面对面。如果多普勒的增强解释是正确的，则BLR与BBH轨道平面未对准$ \ sim51^\ circ $，这表明多普勒的连续性变化对宽线发射的影响很小，因此不会导致定期线变化。我们进一步讨论了这种BLR构型相对于BBH轨道平面的可能影响。
PG1302-102 is thought to be a supermassive binary black hole (BBH) system according to the periodical variations of its optical and UV photometry, which may be interpreted as being due to the relativistic Doppler boosting of the emission mainly from the disk around the secondary black hole (BH) modulated by its orbital motion. In this paper, we investigate several broad emission lines of PG1302-102 using archived UV spectra obtained by IUE, GALEX, and Hubble, to reveal the broad-line region (BLR) emission properties of this BBH system under the Doppler boosting scenario. We find that the broad lines Ly$α$, NV, CIV, and CIII] all show Gaussian profiles, and none of these lines exhibits obvious periodical variation. Adopting a simple model for the BLR, we perform Markov chain Monte Carlo fittings to these broad lines, and find that the BLR must be viewed at an orientation angle of $\sim33^{\circ}$, close to face-on. If the Doppler boosting interpretation is correct, then the BLR is misaligned with the BBH orbital plane by an angle of $\sim51^\circ$, which suggests that the Doppler boosted continuum variation has little effect on the broad-line emission and thus does not lead to periodical line variation. We further discuss the possible implications for such a BLR configuration with respect to the BBH orbital plane.
