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arXiv 1607.04533astro-ph.GA
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红外干涉测量与活动星系核:秒差距尺度的对流和尘埃外流

Infrared Interferometry and AGNs: Parsec-scale Disks and Dusty Outflows

Leonard Burtscher, Sebastian Hönig, Walter Jaffe, Makoto Kishimoto, Noel Lopez-Gonzaga, Klaus Meisenheimer, Konrad R. W. Tristram

摘要:

环面是目前最流行的活动星系核统一理论的核心元素,但它通常被描述为“假定的”,因为它还没有被成像。由于它太小,无法用单碟望远镜分辨,人们只能使用模型对它的结构做出间接的假设。然而,使用红外干涉测量,我们能够解决几个附近的活动星系核周围的尘埃分布,并实现了一些进一步的二十几个源的约束。我们在所有来源中发现了秒差距尺度的环核尘埃,并且在附近的两个来源中,能够将这种尘埃分解为两种不同的成分。紧凑的组件,一个非常薄的磁盘,似乎是连接到微波激射磁盘和扩展的,这是负责大部分的中红外通量,是垂直于环核气体磁盘取向。当我们想到标准的统一漫画实际上与更大尺度上的观察很好地联系起来时,可能会感到惊讶。极区的光学薄尘埃,也许是由盘风驱动的,可以解决环面的尺度高度问题,并解释中红外X射线关系中缺失的各向异性。

英文摘要:

The "torus" is the central element of the most popular theory unifying various classes of AGNs, but it is usually described as "putative" because it has not been imaged yet. Since it is too small to be resolved with single-dish telescopes, one can only make indirect assumptions about its structure using models. Using infrared interferometry, however, we were able to resolve the circum-nuclear dust distributions for several nearby AGNs and achieved constraints on some further two dozen sources. We discovered circum-nuclear dust on parsec scales in all sources and, in two nearby sources, were able to dissect this dust into two distinct components. The compact component, a very thin disk, appears to be connected to the maser disk and the extended one, which is responsible for most of the mid-IR flux, is oriented perpendicularly to the circum-nuclear gas disks. What may come as a surprise when having in mind the standard unification cartoon actually connects well to observations on larger scales. Optically thin dust in the polar region, perhaps driven by a disk wind, could solve both the scale height problem of the torus and explain the missing anisotropy in the mid-IR - X-ray relation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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