论文标题
爆发阶段的变形外观核核NGC〜4151的速度分辨的回响映射：宽线区域运动学演变的证据
Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC~4151 During Outburst Stage: Evidence for Kinematics Evolution of Broad-line Region
论文作者
论文摘要
引起了很多关注的更换活跃的银河核NGC〜4151正在其进化史上的第二个戏剧性爆发阶段。为了研究宽线区域（BLR）的几何形状和运动学，并测量NGC〜4151中超大质量黑洞的质量，我们使用Lijiang opmervatory的2.4 M望远镜在2020--2021的2020--2021进行了七个月的光度和光谱监测计划。我们成功地测量了从宽\ h，\ hb，\ hg，\ hei和\ heii \发射线到连续变化的时间段的时间滞后，该响应是$ 7.63 _ { - 2.62}^{ - 2.62}^{+1.85} $，+1.85} $，$ 6.21 _ { - 1.21 _ { - 1.13}^ - 1.13}^$ 1.41} $ 5.67 _ { - 1.94}^{+1.65} $，$ 1.59 _ { - 1.11}^{+0.86} $，和$ 0.46 _ { - 1.06}^{+1.22} $ 1.22} $ days，$ 1.22} $ days，$ 1.22} $ days $ the radial Stratefiention。这些线的时间滞后比率为$ 1.23：1.00：0.91：0.26：0.07 $。我们发现，紫外线和光条之间的连续滞后会显着影响\ hei \ and \ heii的滞后测量。在这项运动中，病毒和插入的气体运动与以前的结果不同，这意味着BLR的进化运动学。根据我们的测量和文献中的先前测量值，我们确认NGC〜4151的BLR基本上是病毒的。最后，我们通过多条线计算黑洞质量，从\ hb \的测量为$ 3.94 _ { - 0.72}^{+0.90} \ times 10^7 m _ {\ odot} $，这与先前的结果一致。相应的积分率为$ 0.02 _ { - 0.01}^{+0.01} l _ {\ rm EDD} c^{ - 2} $，暗示着一个子埃德丁顿增生器。
Changing-look active galactic nucleus NGC~4151, which has attracted a lot of attention, is undergoing the second dramatic outburst stage in its evolutionary history. To investigate the geometry and kinematics of the broad-line region (BLR), and measure the mass of supermassive black hole in NGC~4151, we perform a seven-month photometric and spectroscopic monitoring program in 2020--2021, using the 2.4 m telescope at Lijiang Observatory. We successfully measure the time lags of the responses from broad \ha, \hb, \hg, \hei, and \heii\ emission lines to continuum variation, which are $7.63_{-2.62}^{+1.85}$, $6.21_{-1.13}^{+1.41}$, $5.67_{-1.94}^{+1.65}$, $1.59_{-1.11}^{+0.86}$, and $0.46_{-1.06}^{+1.22}$ days, respectively, following radial stratification. The ratios of time lags among these lines are $1.23 : 1.00 : 0.91 : 0.26 : 0.07$. We find that the continuum lag between the ultraviolet and optical bands can significantly affect the lag measurements of \hei\ and \heii. Virial and infalling gas motions coexist in this campaign, which is different from previous results, implying the evolutionary kinematics of BLR. Based on our measurements and previous ones in the literature, we confirm that the BLR of NGC~4151 is basically virialized. Finally, we compute the black hole mass through multiple lines, and the measurement from \hb\ to be $ 3.94_{-0.72}^{+0.90} \times 10^7 M_{\odot}$, which is consistent with previous results. The corresponding accretion rate is $0.02_{-0.01}^{+0.01} L_{\rm Edd} c^{-2}$, implying a sub-Eddington accretor.
