位于盘状星系IC 2497中心的一个被遮蔽的AGN是造成汉尼的Voorwerp的原因吗？
Is an obscured AGN at the centre of the disk galaxy IC 2497 responsible for Hanny's Voorwerp?
摘要：
本文介绍了大质量盘星系IC 2497的VLBI和MERLIN观测结果。对IC 2497的光学观测显示，在该星系附近存在一个巨大的发射星云“Hanny's Voorwerp”。早期的短轨18厘米观测与e-VLBI在18厘米，检测到一个紧凑的无线电组件（C1）在IC 2497的中心。测得C1的亮温大于4 E5 K。更深的，长轨的e-VLBI观测再次证实了C1的存在，但也揭示了第二个紧凑的组件（C2）的存在，位于C1东北约230毫角秒。C2的亮度温度大于1.4E5K，表明这两个成分可能与活动星系核活动有关（例如射电核心和喷流热点）。较低分辨率的18 cm MERLIN观测显示了这两个分量。C1是紧凑的，沿着Hanny的Voorwerp方向有轻微的伸长，C2在几乎垂直于Voorwerp方向的方向上有大量的延伸发射。我们的研究结果继续支持这一假设，即IC 2497包含一个活动星系核（AGN），并与此AGN相关的喷流清除了一条路径，允许来自AGN的电离辐射直接照亮发射星云。
英文摘要：
We present the results of VLBI and MERLIN observations of the massive disk galaxy IC 2497. Optical observations of IC 2497 revealed the existence of a giant emission nebula "Hanny's Voorwerp" in the proximity of the galaxy. Earlier short-track 18 cm observations with e-VLBI at 18 cm, detected a compact radio component (C1) at the centre of IC 2497. The brightness temperature of C1 was measured to be greater than 4E5 K. Deeper, long-track e-VLBI observations presented here, re-confirm the existence of C1 but also reveal the existence of a second compact component (C2) located about 230 milliarcseconds to the North-East of C1. The brightness temperature of C2 is measured to be greater than 1.4E5 K, suggesting that both components may be related to AGN activity (e.g. a radio core and jet hotspot). Lower resolution 18cm MERLIN observations show both components. C1 is shown to be compact with a slight elongation along the direction of Hanny's Voorwerp, and C2 shows a lot of extended emission in an almost perpendicular direction to the direction of the Voorwerp. Our results continue to support the hypothesis that IC 2497 contains an Active Galactic Nucleus (AGN), and that a jet associated with this AGN clears a path that permits ionising radiation from the AGN to directly illuminate the emission nebula.
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