2型冠状线森林AGN的中间倾角
Intermediate Inclinations of Type 2 Coronal-Line Forest AGN
摘要：
冕线森林活动星系核（CLiF AGN）是一个引人注目的现象，因为它们的光谱中有丰富的日冕发射线（例如[FeVII]，[FeX]和[NeV]）。Rose，Elvis & Tadhunter（2015）认为，内部的模糊环面壁是CLiF活动星系核中日冕线区域最有可能的位置，而被禁止的高电离线的异常强度是由于活动星系核-环面的特定倾角。在这里，我们测试这一建议使用中红外颜色（4.6 $μ$ m-22 $μ$ m）从宽视场红外巡天探测器（WISE）的CLiF活动星系核。我们使用Fischer等人（2014年）的结果，该结果表明，随着活动星系核环面的倾斜度变得更加正面，斯皮策5.5 $μ$ m到30 $μ$ m的颜色变得更蓝。我们发现CLiF活动星系核的[W2-W 4]颜色（$\langle$ [W2-W 4] $\rangle$ = 5.92 $\pm$ 0.12）介于SDSS 1型（$\langle$ [W2-W 4] $\rangle$ = 5.22 $\pm$ 0.01）和2型活动星系核（$\langle$ [W2-W 4] $\rangle$ = 6.35 $\pm$ 0.03）之间。这意味着CLiF活动星系核的活动星系核环面倾角确实是中等的，支持Rose，Elvis \& Tadhunter（2015）的工作。CLiF活动星系核与它们的视角之间的关系的证实表明，CLiF活动星系核可能有助于我们理解活动星系核的统一。
英文摘要：
Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are remarkable in the sense that they have a rich spectrum of dozens of coronal emission lines (e.g. [FeVII], [FeX] and [NeV]) in their spectra. Rose, Elvis & Tadhunter (2015) suggest that the inner obscuring torus wall is the most likely location of the coronal line region in CLiF AGN, and the unusual strength of the forbidden high ionization lines is due to a specific AGN-torus inclination angle. Here we test this suggestion using mid-IR colours (4.6$μ$m-22$μ$m) from the Wide-Field Infrared Survey Explorer (WISE) for the CLiF AGN. We use the Fischer et al. (2014) result that showed that as the AGN-torus inclination becomes more face on, the Spitzer 5.5$μ$m to 30$μ$m colours become bluer. We show that the [W2-W4] colours for the CLiF AGN ($\langle$[W2-W4]$\rangle$ = 5.92$\pm$0.12) are intermediate between SDSS type 1 ($\langle$[W2-W4]$\rangle$ = 5.22$\pm$0.01) and type 2 AGN ($\langle$[W2-W4]$\rangle$ = 6.35$\pm$0.03). This implies that the AGN-torus inclinations for the CLiF AGN are indeed intermediate, supporting the work of Rose, Elvis \& Tadhunter (2015). The confirmed relation between CLiF AGN and their viewing angle shows that CLiF AGN may be useful for our understanding of AGN unification.
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