Q2122-444：一个赤裸的AGN，穿戴整齐
Q2122-444: a naked AGN fully dressed
摘要：
根据以前的光谱和时间光学研究，Q2122-444被分类为裸活动星系核或真正的2型活动星系核，即真正缺乏宽线区（BLR）的活动星系核。它的光谱似乎只具有典型的2型活动星系核（被遮蔽）的狭窄的禁止发射线，但从二十多年的监测活动中获得的长期光学光变曲线显示出很强的可变性，显然排除了严重遮蔽的存在。在这里，我们提出的结果，从一个~40 ksXMM-牛顿观测Q2122-444进行阐明这个神秘的活动星系核的能量。X射线分析得到了ATCA无线电数据的补充，以评估可能存在的喷流，并与新的NTT/EFOSC 2光谱数据，以验证实际上没有BLR。更高质量的光学数据揭示了强烈而广泛的巴耳末线的存在，这与以前的光谱分类不一致。没有探测到无线电发射排除了喷气式飞机的存在。结合X射线数据和由XMM-Newton上的OM进行的同步紫外观测，证实了Q2122-444是一个典型的没有任何明显的本征吸收的第一型活动星系核。根据宽巴耳末线和基于X射线光谱数据的新标度技术，对黑洞质量的新估计表明，Q2122-444以相对较高的爱丁顿单位吸积。
英文摘要：
Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked AGN or true type 2 AGN, that is, an AGN that genuinely lacks a broad line region (BLR). Its optical spectrum seemed to possess only narrow forbidden emission lines that are typical of type 2 (obscured) AGNs, but the long-term optical light curve, obtained from a monitoring campaign over more than two decades, showed strong variability, apparently ruling out the presence of heavy obscuration. Here, we present the results from a ~40 ks XMM-Newton observation of Q2122-444 carried out to shed light on the energetics of this enigmatic AGN. The X-ray analysis was complemented with ATCA radio data to assess the possible presence of a jet, and with new NTT/EFOSC2 optical spectroscopic data to verify the actual absence of a BLR. The higher-quality optical data revealed the presence of strong and broad Balmer lines that are at odds with the previous spectral classification of this AGN. The lack of detection of radio emission rules out the presence of a jet. The X-ray data combined with simultaneous UV observations carried out by the OM aboard XMM-Newton confirm that Q2122-444 is a typical type-1 AGN without any significant intrinsic absorption. New estimates of the black hole mass independently obtained from the broad Balmer lines and from a new scaling technique based on X-ray spectral data suggest that Q2122-444 is accreting at a relatively high rate in Eddington units.
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