Broad-line region in NGC 4151 monitored by two decades of reverberation mapping campaigns – I. Evolution of structure and kinematics
Broad-line region in NGC 4151 monitored by two decades of reverberation mapping campaigns – I. Evolution of structure and kinematics
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通过二十年的混响测绘活动监测 NGC 4151 的宽线区域 – I. 结构和运动学的演变
DOI：
10.1093/mnras/stad051
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发表时间：
2023
影响因子：
4.8
通讯作者：
Brotherton, Michael S.
中科院分区：
文献类型：
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作者：
Chen, Yong-Jie;Bao, Dong-Wei;Zhai, Shuo;Fang, Feng-Na;Hu, Chen;Du, Pu;Yang, Sen;Yao, Zhu-Heng;Li, Yan-Rong;Brotherton, Michael S.
基于FAST光谱仪公开存档项目的存档观测和我们在怀明红外天文台2.3米望远镜的新观测，我们报告了1994年至2022年期间附近活动星系核（agn） NGC 4151的长期混响测绘活动的结果。我们以一致的方式减少和校准了所有光谱，并得到了宽H β线和5100 Å连续体的光曲线。连续光曲线也构建使用公共档案的光度数据，以增加采样节奏。我们使用哈勃太空望远镜成像来减去宿主星系的污染，以校正校准光曲线的通量。利用长期存档的光度数据，我们完成了AGN连续体的绝对通量校准。我们发现H β时间延迟与5100 Å光度相关。这与Bentz等人的agn的全局尺寸-光度关系非常一致。此外，五个季节的数据集使我们能够获得H β线的速度分辨延迟，显示出不同的结构（流出，流入和圆盘）。将我们的结果与之前的独立测量结果相结合，我们发现H β宽线区域（BLR）的测量动态可能与光度的长期趋势有关。在BLR半径和光度的变化之间也可能存在额外的~ 1.86年的时间滞后。这些结果表明，BLR的动态变化可能是由辐射压力的影响驱动的。
We report the results of long-term reverberation mapping campaigns of the nearby active galactic nuclei (AGNs) NGC 4151, spanning from 1994 to 2022, based on archived observations of the FAST Spectrograph Publicly Archived Programs and our new observations with the 2.3 m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all the spectra in a consistent way, and derive light curves of the broad H β line and 5100 Å continuum. Continuum light curves are also constructed using public archival photometric data to increase sampling cadences. We subtract the host galaxy contamination usingHubble Space Telescopeimaging to correct fluxes of the calibrated light curves. Utilizing the long-term archival photometric data, we complete the absolute flux-calibration of the AGN continuum. We find that the H β time delays are correlated with the 5100 Å luminosities as. This is remarkably consistent with Bentz et al. ’s global size–luminosity relationship of AGNs. Moreover, the data sets for five of the seasons allow us to obtain the velocity-resolved delays of the H β line, showing diverse structures (outflows, inflows, and discs). Combining our results with previous independent measurements, we find the measured dynamics of the H β broad-line region (BLR) are possibly related to the long-term trend of the luminosity. There is also a possible additional ∼1.86 yr time lag between the variation in BLR radius and luminosity. These results suggest that dynamical changes in the BLR may be driven by the effects of radiation pressure.