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arXiv 2005.03901astro-ph.GAastro-ph.CO
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10个类星体维里因子的个别估计:对宽线区动力学的意义

Individual Estimates of the Virial Factor in 10 Quasars: Implications on the Kinematics of the Broad Line Region

E. Mediavilla, J. Jiménez-Vicente, J. Mejí A-Restrepo, V. Motta, E. Falco, J. A. Muñoz, C. Fian, E. Guerras

摘要:

假设引力起源的Fe III $λλ$ 2039-2113红移和使用微透镜的发射这一功能的区域的大小为基础的估计,我们获得的维里因子,$f$,在10个类星体的个人测量。巴耳末线的平均值,$\langle f_{Hβ}\rangle={\bf 0.43\pm 0.20}$和$\langle f_{Hα}\rangle={\bf 0.50\pm 0.24}$,是在良好的协议与以前的研究结果,具有可比宽度的线的对象。在Mg II的情况下,也可以获得一致的结果,$f_{Mg II} \sim {\bf 0.44}$,接受发射区域尺寸的合理缩放。个体测量的累积直方图$CDF(f)$的建模指示各向同性和圆柱运动之间的比率$a\sim {\bf 0.4}-0.7$的{相对}高的值。相反,我们发现非常大的值的维里因子相关的Fe III $λλ$ 2039-2113混合物,$f_{FeIII}=14.3\pm2.4$,这可以解释,如果这一功能产生于一个扁平的近面对面的结构,类似于吸积盘。

英文摘要:

Assuming a gravitational origin for the Fe III$λλ$2039-2113 redshift and using microlensing based estimates of the size of the region emitting this feature, we obtain individual measurements of the virial factor, $f$, in 10 quasars. The average values for the Balmer lines, $\langle f_{Hβ}\rangle={\bf 0.43\pm 0.20}$ and $\langle f_{Hα}\rangle={\bf 0.50\pm 0.24}$, are in good agreement with the results of previous studies for objects with lines of comparable widths. In the case of Mg II, consistent results, $f_{Mg II} \sim {\bf 0.44}$, can be also obtained accepting a reasonable scaling for the size of the emitting region. The modeling of the cumulative histograms of individual measurements, $CDF(f)$, indicates a {relatively} high value for the ratio between isotropic and cylindrical motions, $a\sim {\bf 0.4}-0.7$. On the contrary, we find very large values of the virial factor associated to the Fe III$λλ$2039-2113 blend, $f_{FeIII}=14.3\pm2.4$, which can be explained if this feature arises from a flattened nearly face-on structure, similar to the accretion disk.

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