Bending of Jets in the QSO NRAO 530
Bending of Jets in the QSO NRAO 530
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DOI：
10.1088/1009-9271/8/2/05
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
X. Hong;ChuanLe Sun;Jun-Hui Zhao;D. Jiang;Zhi-qiang Shen;T. An;Weihua Wang;Jun Yang
中科院分区：
文献类型：
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作者：
X. Hong;ChuanLe Sun;Jun-Hui Zhao;D. Jiang;Zhi-qiang Shen;T. An;Weihua Wang;Jun Yang
我们目前的无线电图像NRAO 530的尺度范围从pc到kpc。观测包括5 GHz的EVN，1.6、8.6和15 GHz的VLBA，1.6和5 GHz的MERLIN，以及5、8.4、15、22和43 GHz的VLA。VLBI图像显示了一个核心喷流结构，其振荡轨迹在最强紧凑组件（核心）以北约30质量的范围内。超光速运动被检测到在五个喷流组件的表观速度在13.6至25.2c的范围内。VLBA观测在15 GHz处检测到一个新的分量，这似乎与2002年的爆发有关。在15 GHz的VLBA观测中，在核心周围检测到显著的偏振发射。偏振强度和偏振角在2002年和2004年之间有快速的变化。在kpc尺度上，在核喷流结构的西北方向（-50度）延伸几百个质量的范围之外，探测到一个位于核以西11 aresec（PA=-86度）的远距离分量（标记为WL）。核心射流结构和WL之间的显着排放被揭示。在与地核成70度角的PA处，还检测到一团弥散发射（标记为EL，长12弧秒），这表明源中存在双瓣。核心分量显示平坦的光谱，而远距离分量WL和EL具有陡峭的光谱。远距离分量的陡峭光谱和拱形发射的检测表明，远距离分量是由NRAO 530的核心供电的瓣或热点。研究了从pc尺度到kpc尺度的形态以及射流的弯曲。观测到的射电形态从pc到kcp似乎有利于模型中的旋进或摆动的核盘驱动的无线电等离子体的螺旋运动，并产生的S形结构的kpc尺度。
We present radio images of NRAO 530 on scales ranging from pc to kpc. The observations include the EVN at 5 GHz, the VLBA at 1.6, 8.6 and 15 GHz, the MERLIN at 1.6 and 5 GHz, and the VLA at 5, 8.4, 15, 22, and 43 GHz. The VLBI images show a core-jet structure with an oscillating trajectory on a scale of about 30 mas north of the strongest compact component (core). Superluminal motions are detected in five of the jet components with apparent velocities in the range of 13.6 to 25.2c. A new component is detected at 15 GHz with the VLBA observations, which appears to be associated with the outburst in 2002. Significant polarized emission is detected around the core with the VLBA observations at 15 GHz. Rapid variations of the polarization intensity and angle are found between the epochs in 2002 and 2004. On the kpc-scale, a distant component (labelled as WL) located 11 aresec west (PA=-86 degrees) of the core is detected beyond the core-jet structure which extended to several hundreds of mas in the north-west direction (-50 degrees). A significant emission between the core-jet structure and the WL is revealed. A clump of diffuse emission (labelled EL, 12 arcsec long) at PA 70 degrees to the core, is also detected in the VLA observations, suggesting the presence of double lobes in the source. The core component shows a flat spectrum, while the distant components WL and EL have steep spectra. The steep spectra of the distant components and the detection of the arched emission suggest that the distant components are lobes or hot-spots powered by the core of NRAO 530. The morphologies from pc- to kpc-scales and the bending of jets are investigated. The observed radio morphology from pc to kcp appears to favor the model in which precession or wobbling of the nuclear disk drives the helical motion of the radio plasma and produces the S-shaped structure on kpc scale.