Coronal-line forest active galactic nuclei – I. Physical properties of the emission-line regions

F. C. Cerqueira-Campos, A. Rodríguez-Ardila, R. Riffell, M. Marinello, Almudena Prieto, L. Dahmer-Hahn
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引用次数: 7

Abstract

Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong high-ionization lines, which contrast to what is found in most AGNs. Here, we carry out a multiwavelength analysis aimed at understanding the physical processes in the Narrow Line Region (NLR) of these objects and unveiling if they are indeed a special class of AGN. By comparing coronal emission-line ratios we conclude that there are no differences between CLiF and non-CLiF AGNs. We derive physical conditions of the narrow line region (NLR) gas and found electron densities in the range $3.6\times$10$^{2}$ - $1.7\times$10$^{4}$ cm$^{-3}$ and temperatures of $3.7\times$10$^{3}$ - $6.3\times$10$^{4}$ K, suggesting that the ionization mechanism is associated primarily with photoionization by the AGN. We suggest a NLR dominated by matter-bounded clouds to explain the high-ionization line spectrum observed. The mass of the central black hole, derived from the stellar velocity dispersion show that most of the objects have values in the interval 10$^{7-8}$~M$\odot$. Our results imply that CLiF AGN is not a separate category of AGNs. In all optical/near-infrared emission-line properties analyzed, they represent an extension to the low/high ends of the distribution within the AGN class.
日冕线森林活动星系核。1 .发射线区域的物理性质
日冕线森林活动星系核(CLiF AGN)的特征是强高电离线,这与大多数AGN中发现的相反。在这里,我们进行了多波长分析,旨在了解这些物体的窄线区域(NLR)的物理过程,并揭示它们是否确实是一类特殊的AGN。通过比较日冕发射在线比,我们得出结论,在CLiF和非CLiF agn之间没有差异。我们推导了窄线区域(NLR)气体的物理条件,发现电子密度在$3.6\乘以$10$^{2}$ - $1.7\乘以$10$^{4}$ cm$^{-3}$和温度为$3.7\乘以$10$^{3}$ - $6.3\乘以$10$^{4}$ K之间,表明电离机制主要与AGN的光电离有关。我们建议一个由物质束缚云主导的近距离辐射来解释观测到的高电离谱线。由恒星速度色散得出的中心黑洞的质量表明,大多数物体的值在10$^{7-8}$~M$\odot$之间。我们的结果表明,CLiF AGN不是一个单独的AGN类别。在所有光学/近红外发射在线特性分析中,它们代表了AGN类分布的低端/高端的延伸。
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