VLBI Observations of a Complete Sample of Radio Galaxies. VII. Study of the FR I Sources 3C 31, 4C 35.03, and 3C 264
VLBI Observations of a Complete Sample of Radio Galaxies. VII. Study of the FR I Sources 3C 31, 4C 35.03, and 3C 264
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DOI：
10.1086/176525
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发表时间：
1990-07
期刊：
影响因子：
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通讯作者：
L. Lara;W. D. Cotton;L. Feretti;G. Giovannini;T. Venturi;J. Marcaide
中科院分区：
文献类型：
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作者：
L. Lara;W. D. Cotton;L. Feretti;G. Giovannini;T. Venturi;J. Marcaide
我们提出的结果，从全球VLBI和VLA观测的三个Fanaroff-Riley I型射电星系，3C 31，4C 35.03，和3C 264，在5 GHz的频率。在所有这三种情况下，我们观察到不对称的秒差距尺度结构组成的一个紧凑的核心和一个单一的喷流指向更突出的千秒差距喷流的方向。我们解释这样的对齐作为证据的相对论性的FR I无线电喷气机在秒差距尺度。比较这些源的VLBI和VLA图像，我们发现从秒差距到千秒差距尺度的等离子体流的渐进减速。我们认为另外五个FR I射电星系研究我们以前发现，在一组8 FR I对象，估计喷流的整体速度和方向角相对于观察者是一致的统一模型的要求，低功率射电源。
We present results from global VLBI and VLA observations of three Fanaroff-Riley type I radio galaxies, 3C 31, 4C 35.03, and 3C 264, at a frequency of 5 GHz. In all three cases, we observe asymmetric parsec-scale structures consisting of a compact core and a single jet pointing in the direction of the more prominent kiloparsec jet. We interpret such alignment as evidence for the relativistic nature of FR I radio jets at parsec scales. Comparing the VLBI and VLA images of these sources, we find a progressive deceleration of the plasma flow from parsec to kiloparsec scales. We consider another five FR I radio galaxies studied previously by us and find that, in a set of eight FR I objects, the estimated jet bulk velocities and orientation angles with respect to the observer are consistent with the requirements of the unification model for low-power radio sources.