The Parsec-Scale Jets of the TeV Blazars H1426+428, 1ES 1959+650, and PKS 2155–304: 2001-2004
The Parsec-Scale Jets of the TeV Blazars H1426+428, 1ES 1959+650, and PKS 2155–304: 2001-2004
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DOI：
10.1086/533521
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发表时间：
2008-01
期刊：
影响因子：
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通讯作者：
B. Piner;Niraj Pant;Philip G. Edwards
中科院分区：
文献类型：
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作者：
B. Piner;Niraj Pant;Philip G. Edwards
本文介绍了2001-2004年TeV耀变体H1426+428、1 ES 1959+650和PKS 2155-304的甚长基线阵列（VLBA）观测结果。我们在8 GHz对H1426+428进行了四个历元的观测，发现它的秒差距尺度结构由一个~17 mJy的核和一个~3 mJy的喷流组成，喷流的视速度为2.09c ± 0.53c。blazar 1 ES 1959+650在15和22 GHz的频率下观测了三个时期。这些双频观测的光谱指数信息被用来确定秒差距尺度结构的核心。PKS 2155-304在15 GHz的双圆偏振的单历元观测，我们提出了这个源的第一个VLBI偏振图像。对于1 ES 1959+650和PKS 2155-304，当前的观测与我们早期论文中的VLBA观测相结合，以大大降低测量误差，从而改进这些源的视速度测量。在1 ES 1959+650中测得的部件C2的新视在速度为0.00c ± 0.04c（静止），在PKS 2155-304中测得的部件C1的新视在速度为0.93c ± 0.31c。我们结合联合收割机的新的表观速度测量从本文中的TeV blazar喷流从我们以前的论文中测量的表观速度，形成一个当前的一组TeV高频峰值BL Lac对象（HBLs）的表观速度测量。TeV高能级激光束喷流中的平均峰值视斑图速度约为1c。最后，我们详细讨论的解释收集的VLBA数据TeV耀变体的TeV耀变体喷流的秒差距尺度结构的理论模型的背景下，本文。
We present Very Long Baseline Array (VLBA) observations of the TeV blazars H1426+428, 1ES 1959+650, and PKS 2155–304 obtained during the years 2001-2004. We observed H1426+428 at four epochs at 8 GHz and found that its parsec-scale structure consisted of a ~17 mJy core and a single ~3 mJy jet component with an apparent speed of 2.09c ± 0.53c. The blazar 1ES 1959+650 was observed at three epochs at frequencies of 15 and 22 GHz. Spectral index information from these dual-frequency observations was used to definitively identify the core of the parsec-scale structure. PKS 2155–304 was observed at a single epoch at 15 GHz with dual-circular polarization, and we present the first VLBI polarimetry image of this source. For 1ES 1959+650 and PKS 2155–304, the current observations are combined with the VLBA observations from our earlier paper to yield improved apparent speed measurements for these sources with greatly reduced measurement errors. The new apparent speed measured for component C2 in 1ES 1959+650 is 0.00c ± 0.04c (stationary), and the new apparent speed measured for component C1 in PKS 2155–304 is 0.93c ± 0.31c. We combine the new apparent speed measurements from this paper with the apparent speeds measured in TeV blazar jets from our earlier papers to form a current set of apparent speed measurements in TeV high-frequency peaked BL Lac objects (HBLs). The mean peak apparent pattern speed in the jets of the TeV HBLs is about 1c. We conclude the paper with a detailed discussion of the interpretation of the collected VLBA data on TeV blazars in the context of current theoretical models for the parsec-scale structure of TeV blazar jets.