ANEPD-CXO245中的环面约束：具有双峰窄线的康普顿厚AGN
Torus Constraints in ANEPD-CXO245: A Compton-thick AGN with Double-Peaked Narrow Lines
摘要：
本文报道了在AKARI NEP深场中，具有双峰光学窄线区（NLR）发射线的康普顿厚度活动星系核ANEPD-CXO 245（z=0.449）的环面约束。这个领域的独特的红外数据，包括那些从9波段测光超过2-24 $μ$米的AKARI红外相机（IRC），和X射线光谱钱德拉允许我们约束环面参数，如环面光学深度，X射线吸收柱，环面角宽度（$σ$）和视角（$i$）。我们分别在X射线（XCLUMPY; Tanimoto et al. 2019）和红外（CLUMPY; Nenkova et al. 2008）中分析了X射线光谱以及紫外-光学-红外光谱能量分布（UOI-SED）。从我们目前的数据来看，X射线和UOI对$σ$ -- $i$的约束表明，视线穿过环面，正如2型活动星系核所预期的那样。我们得到了一个小的X射线散射分数（<0.1%），这表明狭窄的环面开口，优先考虑双峰轮廓的双极流出图片。通过比较UOI-SED观测到的环面光学厚度和X射线谱的吸收柱密度$N_{\rm H}$，我们发现气尘比是银河系的$\gtrsim 4$倍。
英文摘要：
We report on the torus constraints of the Compton-thick AGN with double-peaked optical narrow line region (NLR) emission lines, ANEPD-CXO245, at z=0.449 in the AKARI NEP Deep Field. The unique infrared data on this field, including those from the nine-band photometry over 2-24 $μ$m with the AKARI Infrared Camera (IRC), and the X-ray spectrum from Chandra allow us to constrain torus parameters such as the torus optical depth, X-ray absorbing column, torus angular width ($σ$) and viewing angle ($i$). We analyze the X-ray spectrum as well as the UV-optical-infrared spectral energy distribution (UOI-SED) with clumpy torus models in X-ray (XCLUMPY; Tanimoto et al. 2019) and infrared (CLUMPY; Nenkova et al. 2008) respectively. From our current data, the constraints on $σ$--$i$ from both X-rays and UOI show that the line of sight crosses the torus as expected for a type 2 AGN. We obtain a small X-ray scattering fraction (<0.1%), which suggests narrow torus openings, giving preference to the bi-polar outflow picture of the double-peaked profile. Comparing the optical depth of the torus from the UOI-SED and the absorbing column density $N_{\rm H}$ from the X-ray spectrum, we find that the gas-to-dust ratio is $\gtrsim 4$ times larger than the Galactic value.
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