The radio counter-jet of the QSO 3C 48

The radio counter-jet of the QSO 3C 48
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QSO 3C 48 的无线电反射机

DOI:
10.1051/0004-6361:20042316
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发表时间:
2004-12
影响因子:
6.5
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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本文介绍了类星体3C 48的多频射电观测结果.观测是用甚大天线阵(VLA)在0.33、1.5、4.8、8.4和22.5 GHz五个频率上进行的,并用多元无线电链接干涉仪网络(MERLIN)在1.6和5 GHz两个频率上进行的。源显示1”内向北的单侧急流,然后向东北延伸,变得弥散。在北方急流中存在两个明亮的分量(N2和N3),它们包含了大部分的通量密度。这两个分量的光谱指数为α(N2),类似于-0.99 +/-0.12,α(N3),类似于-0.84 +/-0.23(S与nu(alpha)成比例)。我们的图像显示了一个扩展的结构周围的组件N2的存在,暗示喷流和宿主星系的星际介质(ISM)之间的强烈相互作用。一个陡峭的光谱成分,标记为S,位于平坦光谱成分西南0.25“处,可能是3C 48的核心,在> 15 σ的显著性下被检测到。组分S的光谱的位置和陡度都表明3C 48中存在反喷流。
We present multi- frequency radio observational results of the quasar 3C 48. The observations were carried out with the Very Large Array ( VLA) at five frequencies, 0.33, 1.5, 4.8, 8.4, and 22.5 GHz, and with the Multi- Element Radio Linked Interferometer Network ( MERLIN) at the two frequencies of 1.6 and 5 GHz. The source shows a one- sided jet to the north within 1", which then extends to the northeast and becomes diffuse. Two bright components ( N2 and N3), containing most of the flux density, are present in the northern jet. The spectral index of the two components is alpha(N2) similar to -0.99 +/- 0.12 and alpha(N3) similar to - 0.84 +/- 0.23 ( S proportional to nu(alpha)). Our images show the presence of an extended structure surrounding component N2, suggestive of strong interaction between the jet and the interstellar medium ( ISM) of the host galaxy. A steep- spectrum component, labelled S, located 0.25 " southwest to the flat- spectrum component which could be the core of 3C 48, is detected at a significance of > 15 sigma. Both the location and the steepness of the spectrum of component S suggest the presence of a counter- jet in 3C 48.
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发表时间: 2000-09
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期刊: The Astronomical Journal
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影响因子: 4.8
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