论文标题
极限FEII发射极PHL 1092的全球特性
Panchromatic Properties of the Extreme FeII Emitter PHL 1092
论文作者
论文摘要
我们介绍了NLS1 Galaxy PHL1092（Z = 0.394）的近红外光谱，这是有史以来最强的FEII发射极，与光学和紫外线数据相结合。我们分别使用幂律以及黑色的身体功能和洛伦兹功能对连续体和宽发射线进行建模。使用文献中最新的FEII模板估算了FEII排放的强度。我们重新估计以4570ang为中心的FEII复合物与h-beta，r_feii的广泛成分之间的比率，获得了2.58的值，近一半先前报道（R_FEII = 6.2），但仍将phl1092放置在极端FEII发射器中。对于低电离线发现的FWHM非常相似（FWHM〜1200 km/s），但比氢系（FWHM（H-Beta）〜1900km/s）明显窄。我们的结果表明，PHL1092中的FEII发射遵循与正常发射器中相同的趋势，而FEII在BLR的外部形成，并与CAII共同存在，而H-Beta则形成靠近中心源。紫外线之间的通量比表明高密度，log（n_h）〜13.0 cm^{ - 3}和低电离参数，log（u）〜-3.5。 NIR FEII模板减去后，在9200AN的FEII凹凸中发现的通量过量及其与光学FEII发射的比较表明，上述物理条件优化了Ly-Alpha荧光过程的效率，这是FEII生产中的主要激发机制。我们讨论了phl1092在特征向量1上下文中的作用。
We present near-infrared spectroscopy of the NLS1 galaxy PHL1092 (z=0.394), the strongest FeII emitter ever reported, combined with optical and UV data. We modeled the continuum and the broad emission lines using a power-law plus a black body function and Lorentzian functions, respectively. The strength of the FeII emission was estimated using the latest FeII templates in the literature. We re-estimate the ratio between the FeII complex centered at 4570Ang and the broad component of H-Beta, R_FeII, obtaining a value of 2.58, nearly half of that previously reported (R_FeII=6.2), but still placing PHL1092 among extreme FeII emitters. The FWHM found for low ionization lines are very similar (FWHM~1200km/s), but significantly narrower than those of the Hydrogen lines (FWHM(H-Beta)~1900km/s). Our results suggest that the FeII emission in PHL1092 follows the same trend as in normal FeII emitters, with FeII being formed in the outer portion of the BLR and co-spatial with CaII, and OI, while H-Beta is formed closer to the central source. The flux ratio between the UV lines suggest high densities, log(n_H)~13.0 cm^{-3}, and a low ionization parameter, log(U)~-3.5. The flux excess found in the FeII bump at 9200Ang after the subtraction of the NIR FeII template and its comparison with optical FeII emission suggests that the above physical conditions optimize the efficiency of the ly-Alpha fluorescence process, which was found to be the main excitation mechanism in the FeII production. We discuss the role of PHL1092 in the Eigenvector 1 context.
