活动星系核中心100 pc各向同性中红外辐射
Isotropic Mid-Infrared Emission from the Central 100 pc of Active Galaxies
摘要：
尘埃对活动星系核（AGN）的内在辐射进行再处理，使其以更长的波长出现。观测到的中红外（MIR）光度基本上取决于中央引擎的光度，但在细节上，它也取决于周围尘埃的几何分布。为了量化这种关系，我们观察附近的正常活动星系核在和平号红外线，以实现优于100 pc的空间分辨率，我们使用吸收校正的X射线光度作为代理的固有活动星系核发射。我们发现光学分类的塞弗特1和2星系之间没有显着差异。光谱的差异，无论是在光学和红外波长，表明活动星系核的直接周围是不球对称的，在标准的统一活动星系核模型。一个cluquitantorus辐射转移模型的定量分析表明，cluquitantorus的局部环境可以解释这种依赖于观看几何形状，同时产生MIR连续发射，保持近各向同性，我们观察到，虽然材料在这些波长不是光学薄。我们发现一些亮度依赖于X-射线/MIR相关的最小尺度的测量，这可能表明增强的尘埃排放与恒星形成，即使在这些子100 pc尺度。
英文摘要：
Dust reprocesses the intrinsic radiation of active galactic nuclei (AGNs) to emerge at longer wavelengths. The observed mid-infrared (MIR) luminosity depends fundamentally on the luminosity of the central engine, but in detail it also depends on the geometric distribution of the surrounding dust. To quantify this relationship, we observe nearby normal AGNs in the MIR to achieve spatial resolution better than 100 pc, and we use absorption-corrected X-ray luminosity as a proxy for the intrinsic AGN emission. We find no significant difference between optically classified Seyfert 1 and 2 galaxies. Spectroscopic differences, both at optical and IR wavelengths, indicate that the immediate surroundings of AGNs is not spherically symmetric, as in standard unified AGN models. A quantitative analysis of clumpy torus radiative transfer models shows that a clumpy local environment can account for this dependence on viewing geometry while producing MIR continuum emission that remains nearly isotropic, as we observe, although the material is not optically thin at these wavelengths. We find some luminosity dependence on the X-ray/MIR correlation in the smallest scale measurements, which may indicate enhanced dust emission associated with star formation, even on these sub-100 pc scales.
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