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Laα fluorescent excitation Excitation of Fe II IN active Galactic nuclei

机译:Laα荧光激发Fe II在活跃银河核中的激发

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摘要

We have calculated Fe II emission-line strengths for active galactic nuclei broad-line regions using precise radiative transfer and Iron Project atomic data. We improve the treatment of all previously considered excitation mechanisms for the Fe II emission, continuum fluorescence, collisional excitation, fluorescence by self-overlap among the iron lines, and fluorescent excitation by Lyα. We demonstrate that Lyα fluorescence is of fundamental importance in determining the strength of the Fe II emission. In addition to enhancing the ultraviolet and optical Fe II flux, Lyα fluorescence also results in significant near-infrared Fe II emission in the 8500-9500 A wavelength Range. New observations are suggested to probe this effect in strong Fe II-emitting quasars.
机译:我们已经使用精确的辐射转移和Iron Project原子数据计算了活跃银河核宽线区域的Fe II发射线强度。我们改善了所有以前考虑的Fe II发射,连续谱荧光,碰撞激发,铁谱线之间自重叠的荧光以及Lyα荧光激发的激发机理的处理。我们证明,Lyα荧光对于确定Fe II发射强度至关重要。除增强紫外线和光学Fe II通量外,Lyα荧光还导致在8500-9500 A波长范围内产生明显的近红外Fe II发射。建议使用新的观察结果来探测强Fe II类星体中的这种作用。

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