Markarian 501内部秒差距的显著边缘增亮
Significant Limb-Brightening in the Inner Parsec of Markarian 501
摘要：
我们提出了三个43 GHz的图像和一个86 GHz的图像Markarian 501 VLBA观测在2005年。86千兆赫的图像显示了一个部分解决的核心，通量密度约为200毫焦耳，大小约为300史瓦西半径，类似于最近的结果Giroletti等人。极端的边缘增亮被发现在内部秒差距的射流在43千兆赫的图像，提供了强有力的观测支持的“脊柱层”结构在这个距离的核心。射流在其轴线的横向上得到很好的分辨，使得高斯模型分量适合射流的每个分支。本文还讨论了旋层亮度比和相对大小、喷流张开角以及对旋层超光速运动的初步探测。
英文摘要：
We present three 43 GHz images and a single 86 GHz image of Markarian 501 from VLBA observations in 2005. The 86 GHz image shows a partially resolved core with a flux density of about 200 mJy and a size of about 300 Schwarzschild radii, similar to recent results by Giroletti et al. Extreme limb-brightening is found in the inner parsec of the jet in the 43 GHz images, providing strong observational support for a `spine-layer' structure at this distance from the core. The jet is well resolved transverse to its axis, allowing Gaussian model components to be fit to each limb of the jet. The spine-layer brightness ratio and relative sizes, the jet opening angle, and a tentative detection of superluminal motion in the layer are all discussed.
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