VLBI Observations of the Gigahertz-Peaked Spectrum Galaxy PKS 1934−638

VLBI Observations of the Gigahertz-Peaked Spectrum Galaxy PKS 1934−638
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千兆赫峰值光谱星系 PKS 1934−638 的 VLBI 观测

DOI:
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发表时间:
2004
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通讯作者:
J. Reynolds
J. Reynolds
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文献类型:
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作者:
R. Ojha;A. Fey;K. Johnston;D. Jauncey;A. Tzioumis;J. Reynolds

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本文介绍了澳大利亚长基线阵列对PKS 1934-638千兆赫峰值谱源的8.4 GHz VLBI观测结果。我们的观测证实了源的紧密双重性质,并在2002年7月和2002年11月分别获得了42.7±0.4 mas和42.6±0.3 mas的分离,当与之前的观测相结合时,得到了23±10 μas的分离率。这一结果表明,在32.1年的时间尺度上,这两个组分的分离发生了微小的变化。名义上,这为紧致对称天体(cso)是年轻源这一新兴共识提供了支持。据我们所知,我们对热点分离的测量是文献中报道的CSO最长的时间覆盖范围。
We present 8.4 GHz VLBI observations of the gigahertz-peaked spectrum source PKS 1934-638 made with the Australian Long Baseline Array. Our observations confirm the compact double nature of the source and yield measured separations of 42.7 ± 0.4 mas at epoch 2002 July and 42.6 ± 0.3 mas at epoch 2002 November, which, when combined with previous observations, yield a rate of separation of 23 ± 10 μas yr-1. This result suggests that over a timescale of 32.1 yr, the separation of the two components has changed marginally. Nominally, this provides support to the emerging consensus that compact symmetric objects (CSOs) are young sources. Our measurement of hot spot separation has, to our knowledge, the longest temporal coverage for a CSO reported in the literature.