活动星系中[Fe ii]和H2发射线的主要激发机制--X射线
X-rays as dominant excitation mechanism of [Fe ii] and H2 emission lines in active galaxies
摘要：
我们研究了活动星系核（AGN）中近红外[Fe ii]和H2发射线的激发机制。我们建立了一个光电离模型网格考虑两个组件的连续，一个帐户的大颠簸组件峰值在1 Ryd和另一个代表的X射线源，占主导地位的连续发射在高能量。考虑了以文献中的Sy 2 Mrk 1066的光度数据得到的光谱能量分布作为电离源的光电离模型。这些模型的结果进行了比较，一个大的样本的观测长缝和积分场单元（IFU）光谱数据的核区域的一个样本的活动对象。我们发现我们的模型很好地再现了观测的[Fe ii]λ1.2570 μm/Paβ与H2λ2.1218 μm/Brγ之间的相关性以及光谱数据中观测到的H2发射线比率之间的关系，我们认为活动核产生的X射线加热可以被认为是[Fe ii]和H2激发的一种共同的和非常重要的机制。
英文摘要：
We investigate the excitation mechanisms of near-infrared [Fe ii] and H2 emission lines observed in Active Galactic Nuclei (AGNs). We built a photoionization model grid considering a two-component continuum, one accounts for the Big Bump component peaking at 1Ryd and another represents the X-ray source that dominates the continuum emission at high energies. Photoionization models considering as ionizing source a spectral energy distribution obtained from photometric data of the Sy 2 Mrk 1066 taken from the literature were considered. Results of these models were compared with a large sample of observational long-slit and Integral field Unit (IFU) spectroscopy data of the nuclear region for a sample of active objects. We found that the correlation between the observational [Fe ii]λ1.2570 μm/Paβ vs. H2λ2.1218 μm/Brγ is well reproduced by our models as well as the relationships that involve the H2 emission line ratios observed in the spectroscopic data.We conclude that the heating by X-rays produced by active nuclei can be considered a common and very important mechanism of excitation of [Fe ii] and H2.
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