An extinction-free AGN selection by 18-band SED fitting in mid-infrared in the AKARI NEP deep field

An extinction-free AGN selection by 18-band SED fitting in mid-infrared in the AKARI NEP deep field
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通过 AKARI NEP 深场中红外 18 波段 SED 拟合进行无消光 AGN 选择

DOI:
10.1093/mnras/stx1947
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发表时间:
2017
影响因子:
4.8
通讯作者:
H. Matsuhara
H. Matsuhara
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ting;T. Goto;T. Hashimoto;N. Oi;H. Matsuhara

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我们开发了一种高效的活动银河核 (AGN) 选择方法,使用中红外 (mid-IR) 中的 18 波段光谱能量分布 (SED) 拟合。活动星系核经常被气体和尘埃遮挡,而那些被遮挡的活动星系核在光学、紫外线和软 X 射线观测中往往会被遗漏。中红外光可以帮助我们利用它们的热发射以无遮挡的方式恢复它们。另一方面,恒星形成星系(SFG)在中红外区域也具有强烈的多环芳烃排放特征。因此,建立准确的方法来区分 AGN 和 SFG 群体非常重要。然而,在之前的中红外调查中,只有 3 或 4 个滤光片可用,因此选择受到限制。我们将 AKARI 的连续 9 个中红外波段与 WISE 和 Spitzer 数据相结合,创建 18 个中红外波段供 AGN 选择。在 AKARI NEP 深场的 4682 个星系中,有 1388 个被选为 AGN 宿主,这意味着 AGN 分数为 29.6$\pm$0.8$\%$(其中 47$\%$ 是 Seyfert 1.8 和 2)。将 SED 拟合到 WISE 和 Spitzer 颜色-颜色图的结果进行比较,发现 Seyferts 经常被以前的研究遗漏。我们的结果已经通过叠加每个样本的中值幅度进行了测试。使用来自 Chandra 的 X 射线数据,我们将 SED 拟合的结果与 WISE 的颜色框选择进行了比较。我们通过 X 射线检测到的 AGN 比之前的方法多了 20$\%$。
We have developed an efficient Active Galactic Nucleus (AGN) selection method using 18-band Spectral Energy Distribution (SED) fitting in mid-infrared (mid-IR). AGNs are often obscured by gas and dust, and those obscured AGNs tend to be missed in optical, UV and soft X-ray observations. Mid-IR light can help us to recover them in an obscuration free way using their thermal emission. On the other hand, Star-Forming Galaxies (SFG) also have strong PAH emission features in mid-IR. Hence, establishing an accurate method to separate populations of AGN and SFG is important. However, in previous mid-IR surveys, only 3 or 4 filters were available, and thus the selection was limited. We combined AKARI's continuous 9 mid-IR bands with WISE and Spitzer data to create 18 mid-IR bands for AGN selection. Among 4682 galaxies in the AKARI NEP deep field, 1388 are selected to be AGN hosts, which implies an AGN fraction of 29.6$\pm$0.8$\%$ (among them 47$\%$ are Seyfert 1.8 and 2). Comparing the result from SED fitting into WISE and Spitzer colour-colour diagram reveals that Seyferts are often missed by previous studies. Our result has been tested by stacking median magnitude for each sample. Using X-ray data from Chandra, we compared the result of our SED fitting with WISE's colour box selection. We recovered more X-ray detected AGN than previous methods by 20$\%$.
使用 AKARI (ASTRO-F) 围绕黄道极进行深河外巡天
DOI: --
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