量化强AGN红外发射的各向异性
Quantifying the anisotropy in the infrared emission of powerful AGN
摘要：
我们使用的restframe近和中红外数据的各向同性选择样本的类星体和射电星系在1.0 \leq z \leq 1.4，这已经发表，研究的红外辐射的波长依赖的各向异性。为此，我们建立了类星体子样本（= 1型活动星系核）和射电星系（= 2型活动星系核）的平均SED，从~1-17 μm，并绘制了两个平均样本的比率。从2到8 μm的静止帧波长，该比值从20逐渐减小到2，在10μm的硅酸盐特征中，该比值约为3。向12μm的方向，该比值进一步减小，并在15 μm处显示出某种高度的各向同性（比值~1.4）。这一结果与从局部塞弗特星系的X射线/中红外相关性得到的上限值一致。我们发现，在我们的高亮度射电大声样本的各向异性是小于无线电安静的低亮度活动星系核，这可能是一个后退环面模型与光度依赖的遮蔽属性的框架内解释。它还表明，相对较小的各向异性程度是一致的cluaptorus模型。
英文摘要：
We use restframe near- and mid-IR data of an isotropically selected sample of quasars and radio galaxies at 1.0 \leq z \leq 1.4, which have been published previously, to study the wavelength-dependent anisotropy of the IR emission. For that we build average SEDs of the quasar subsample (= type 1 AGN) and radio galaxies (= type 2 AGN) from ~1-17 μm and plot the ratio of both average samples. From 2 to 8 μm restframe wavelength the ratio gradually decreases from 20 to 2 with values around 3 in the 10μm silicate feature. Longward of 12μm the ratio decreases further and shows some high degree of isotropy at 15 μm (ratio ~1.4). The results are consistent with upper limits derived from the X-ray/mid-IR correlation of local Seyfert galaxies. We find that the anisotropy in our high-luminosity radio-loud sample is smaller than in radio-quiet lower-luminosity AGN which may be interpreted in the framework of a receding torus model with luminosity-dependent obscuration properties. It is also shown that the relatively small degree of anisotropy is consistent with clumpy torus models.
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