AGN宽线区边缘首次发现禁制发射线？
The First Detection of Forbidden Emission Lines at the Outskirts of the AGN Broad Line Region?
AI总结：
研究首次在AGN宽线区边缘发现禁制发射线，通过盘状模型拟合揭示低密度区域可产生此类发射线。
摘要：
活动星系核（AGNs）中的双峰（DP）宽发射线轮廓通常被解释为旋转盘状结构在宽线区（BLR）的特征，并且在低亮度AGNs中常用再结合线观测。我们利用光学光谱学研究了不仅在氢再结合线中观察到的双峰宽发射线轮廓，还出现在LINER星系IC 1459中的禁制跃迁。我们检测到所有强光学线中的DP发射，除了[S II]双峰，其临界密度最低。我们成功地使用盘状BLR模型拟合了DP宽轮廓，假设一个圆形吸积盘，倾角约为35度，内部湍流约为500 km/s，限制在最大半径为9.6（+4.8，-1.1）光年之内。我们估计DP轮廓的全宽半高为约3300 km/s。我们的结果提供了BLR结构的新见解，表明禁制发射线可以在BLR边缘附近较低密度区域产生。
英文摘要：
Double-peaked (DP) broad emission line profiles in active galactic nuclei (AGNs) are often interpreted as signatures of rotating disk-like structures in the broad-line region (BLR) and are commonly observed in low-luminosity AGNs using recombination lines. We use optical spectroscopy to investigate the origin of double-peaked broad emission line profiles observed not only in hydrogen recombination lines but also in forbidden transitions in the LINER galaxy IC 1459. We detected DP emission in all strong optical lines except for the [S II] doublet, which has the lowest critical density among all the lines. We successfully fitted the DP broad profiles using a disk-like BLR model, assuming a circular accretion disk with an inclination of approximately 35 degrees and internal turbulence of about 500 km/s, confined within a maximum radius of 9.6 (+4.8, -1.1) light-years. We estimate a full width at half maximum of the DP profiles of about 3300 km/s. Our results provide new insights into the structure of the BLR, indicating that forbidden emission lines can be produced in lower-density regions near the outskirts of the BLR.
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