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DISCOVERY OF AN OPTICAL SYNCHROTRON JET IN 3C 78

机译:在3C中发现光学同步加速器78

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摘要

We report the discovery of an optical synchrotron jet emanating from the nucleus of NGC 1218, the galaxy hosting the radio source 3C 78. The jet is similar to that of M87, although smaller in projected length. The observations were obtained as part of our Hubble Space Telescope "snapshot" program to acquire broadband images with high spatial resolution of 3CR radio sources. Although the number of known optical synchrotron jets is small, this may be primarily due to observational limitations, and a major goal of the snapshot survey is to establish the frequency with which the optical jet phenomenon occurs. We present preliminary statistics showing that "optical jet" radio sources appear smaller than average. Statistically, sources with optical hot spots seem to obey the same relationship. If beaming is a contributory factor, then this suggests that hot spots too are beamed; however, environment or age may also play a substantial role.
机译:我们报告发现了一个由NGC 1218核发出的光学同步加速器射流,该核是容纳无线电源3C 78的星系。该射流与M87的射流相似,但投影长度较小。这些观测结果是作为我们的哈勃太空望远镜“快照”程序的一部分获得的,以获取具有3CR无线电源的高空间分辨率的宽带图像。尽管已知的光学同步加速器射流的数量很少,但这可能主要是由于观察限制,快照调查的主要目标是确定发生光学射流现象的频率。我们提供的初步统计数据表明,“光学射流”无线电源似乎小于平均水平。从统计上讲,具有光学热点的光源似乎遵循相同的关系。如果用波束传输是一个促成因素,则表明热点也被波束传输。但是,环境或年龄也可能起重要作用。

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