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Two active nuclei in 3C 294

机译：3C 294中的两个活动核

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The z = 1.786 radio galaxy 3C 294 lies < 10&DPRIME; from a 12 mag star and has been the target of at least three previous investigations using adaptive optics (AO) imaging. A major problem in interpreting these results is the uncertainty in the precise alignment of the radio structure with the H- or K-band AO imaging. Here we report observations of the position of the AO guide star with the Hubble Space Telescope Fine Guidance Sensor, which, together with positions from the second United States Naval Observatory's CCD Astrograph Catalog (UCAC2), allow us to register the infrared and radio frames to an accuracy of better than 0.&DPRIME;1. The result is that the nuclear compact radio source is not coincident with the brightest discrete object in the AO image, an essentially unresolved source on the eastern side of the light distribution, as Quirrenbach and coworkers had suggested. Instead, the radio source is centered about 0.&DPRIME;9 to the west of this object, on one of the two apparently real peaks in a region of diffuse emission. Nevertheless, the conclusion of Quirrenbach and coworkers that 3C 294 involves an ongoing merger appears to be correct: analysis of a recent deep Chandra image of 3C 294 obtained from the archive shows that the nucleus comprises two X-ray sources, which are coincident with the radio nucleus and the eastern stellar object. The X-ray/optical flux ratio of the latter makes it extremely unlikely that it is a foreground Galactic star. [References: 31]
机译：z = 1.786的无线电星系3C 294位于<10＆DPRIME;这是一颗12颗磁星的恒星，并且已经成为至少三个之前使用自适应光学（AO）成像技术进行研究的目标。解释这些结果的主要问题是无线电结构与H或K波段AO成像精确对准的不确定性。在这里，我们报告用哈勃太空望远镜精细制导传感器观测到的AO导星的位置，再加上第二个美国海军天文台的CCD天文图录（UCAC2）的位置，就可以将红外和无线电帧注册到精度优于0。＆DPRIME; 1。结果是，核紧凑型无线电源与AO图像中最亮的离散对象并不重合，这是光分布东侧上一个基本上未解析的源，正如Quirrenbach及其同事所建议的那样。取而代之的是，无线电源位于该对象西面约0.9的中心，位于漫射发射区域中两个明显的真实峰值之一上。尽管如此，Quirrenbach及其同事关于3C 294正在进行合并的结论似乎是正确的：对最近从档案中获得的3C 294深Chandra图像的分析表明，原子核包含两个X射线源，与X射线源重合。放射性核和东部恒星物体。后者的X射线/光通量比非常不可能使它成为前景的银河系恒星。 [参考：31]

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