活动星系核 I Zw 1 光学与近红外光谱中铁发射的联合分析
Joint analysis of the iron emission in the optical and near-infrared spectrum of I Zw 1
AI总结：
本研究首次使用 CLOUDY 代码对典型活动星系核 IZw1 的光学与近红外光谱进行 FeII 发射联合建模，通过对比观测谱线通量比，限制了 BLR 云密度与金属含量，并揭示了微湍流对 FeII 伪连续谱强度的影响。
摘要：
限制超大质量黑洞（SMBH）附近电离介质的物理条件对于理解这些复杂系统的运作方式至关重要。诸如铁（Fe）等金属发射线是追踪这些吸积系统中气态介质的丰度、活动和演化的有效探针。其中，FeII 发射一直是许多先前研究的焦点，旨在研究产生这些发射线的宽发射线区（BELR）的能量学、运动学和组成。在本研究中，我们首次在光学和近红外（NIR）区域进行了同时的 FeII 建模。我们使用 CLOUDY 光电离代码模拟了 4000-12000 埃波长区间的两个光谱区域。我们将模型预测与 IZw1（一个典型的强 FeII 发射活动星系核，AGN）的观测谱线通量比进行了比较。通过检查广泛的参数空间，这允许对最适合产生 FeII 发射的 BLR 云密度和金属含量施加限制，并可扩展至类似 IZw1 的源。我们展示了光学和 NIR 中 FeII 伪连续谱的显著且独特的特征，特别关注了微湍流对 FeII 发射强度的影响。
英文摘要：
Constraining the physical conditions of the ionized media in the vicinity of an active supermassive black hole (SMBH) is crucial to understanding how these complex systems operate. Metal emission lines such as iron (Fe) are useful probes to trace the gaseous media's abundance, activity, and evolution in these accreting systems. Among these, the FeII emission has been the focus of many prior studies to investigate the energetics, kinematics, and composition of the broad-emission line region (BELR) from where these emission lines are produced. In this work, we present the first simultaneous FeII modeling in the optical and near-infrared (NIR) regions. We use CLOUDY photoionization code to simulate both spectral regions in the wavelength interval 4000-12000 Angstroms. We compare our model predictions with the observed line flux ratios for IZw1 - a prototypical strong FeII-emitting active galactic nuclei (AGN). This allows putting constraints on the BLR cloud density and metal content that is optimal for the production of the FeII emission, which can be extended to IZw1-like sources, by examining a broad parameter space. We demonstrate the salient and distinct features of the FeII pseudo-continuum in the optical and NIR, giving special attention to the effect of micro-turbulence on the intensity of the FeII emission.
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