Seven-frequency VLBI observations of the GHz-Peaked-Spectrum source OQ 208

Seven-frequency VLBI observations of the GHz-Peaked-Spectrum source OQ 208
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GHz 峰值频谱源 OQ 208 的七频 VLBI 观测

DOI:
10.1088/1009-9271/7/5/01
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发表时间:
2007-03
期刊:
CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
影响因子:
--
通讯作者:
Shen, Zhi-Qiang
Shen, Zhi-Qiang
中科院分区:
其他
文献类型:
--
作者:
Luo, Wen-Feng;Cui, Lang;Yang, Jun;Liu, Xiang;Shen, Zhi-Qiang

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本文给出了超长基线阵列在1.4、1.7、2.3、5.0、8.4、15.4 GHz和欧洲VLBI网络在6.7 GHz下获得的GHz峰谱射电源OQ 208的准同步VLBI图像。低频(1.4、1.7和2.3 GHz)观测显示,在-110度位置角约30mas处有一个微弱的、扩展的陡谱成分,这可能是残余发射。OQ 208的射电结构由5.0、6.7、8.4和15.4 GHz的两个小波瓣组成。我们的光谱分析进一步证实了西南瓣经历了自由-自由吸收,并且发现自由-自由吸收在内部区域更强。通过对1994 ~ 2005年的8.4 GHz图像进行拟合,得到两个小波瓣之间的分离速度为0.031+/-0.006 mas yr(-1)。这表明射电源的射流固有运动为0.105+/-0.020 c,运动年龄为219+/-42年。
We present quasi-simultaneous VLBI images of the GHz-Peaked-Spectrum radio source OQ 208 obtained with the Very Long Baseline Array at 1.4, 1.7, 2.3, 5.0, 8.4, 15.4 GHz and the European VLBI Network at 6.7 GHz. The low frequency (1.4, 1.7 and 2.3 GHz) observations reveal a weak and extended steep-spectrum component at about 30mas away at position angle -110 degrees, which may be a remnant emission. The radio structure of OQ 208 consists of two mini-lobes at 5.0, 6.7, 8.4 and 15.4 GHz. Our spectral analysis further confirms that the southwest lobe undergoes free-free absorption and finds that the free-free absorption is stronger in the inner region. By fitting the 8.4 GHz images from 1994 to 2005, we obtain a separation speed of 0.031+/-0.006 mas yr(-1) between the two mini-lobes. This indicates a jet proper motion of 0.105+/-0.020 c and a kinematic age of 219+/-42 yr for the radio source.
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