Erratum: VLBA observations of GHz-Peaked-Spectrum radio sources at 15 GHz
Erratum: VLBA observations of GHz-Peaked-Spectrum radio sources at 15 GHz
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DOI：
10.1051/0004-6361:20011101
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发表时间：
2001-08
影响因子：
6.5
通讯作者：
C. Stanghellini;D. Dallacasa;C. O’Dea;S. Baum;R. Fanti;C. Fanti
中科院分区：
文献类型：
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作者：
C. Stanghellini;D. Dallacasa;C. O’Dea;S. Baum;R. Fanti;C. Fanti
我们展示了 10 GHz 峰值频谱 (GPS) 无线电源的 15 GHz 的 VLBA 观测结果。核心通常很难或不可能定位。当发现可能的核心时，它们只占 GPS 星系中通量密度的一小部分（大约或低于 2%），而在 GPS 类星体中，它们可以占总通量密度的 20% 以上。我们检测到 GPS 源中的低极化（即通常小于百分之几，通常小于百分之一）。这表明秒差距尺度结构中的低偏振是 GPS 源的重要定义特征。这些新数据基本上证实了射电形态与光学识别之间的二分法，即星系是对称的而类星体不是对称的，这也表明GPS类星体的射电发射以喷流为主，通常具有弱或隐藏的核心，表明它们与视线成中等角度，因此仅发出适度的光束。
We present VLBA observations at 15 GHz of ten GHz Peaked Spectrum (GPS) radio sources. The cores are often dicult or impossible to locate. When likely cores are found, they account for a small fraction of the flux density in GPS galaxies { around or below 2%, while in GPS quasars they can account for more than 20% of the total flux density. We detect low polarization in the GPS sources { i.e., typically less than a few percent and often less than one percent. This establishes that low polarization in the parsec scale structure is an important dening characteristic of the GPS sources. The dichotomy in the radio morphology versus optical identication, i.e., galaxies are symmetric and quasars are not, is basically conrmed from these new data, which also indicate that the radio emission from GPS quasars is dominated by a jet, with often a weak or hidden core, suggesting they are at moderate angles to the line of sight, and so are only moderately beamed.