完整S5极帽样本中放射源组件的绝对运动学。IV。射电核心十年来的自行和光谱特性
Absolute kinematics of radio-source components in the complete S5 polar cap sample. IV. Proper motions of the radio cores over a decade and spectral properties
摘要：
我们对完整的S5极冠样本中的13个河外射电源进行了两个甚长基线干涉测量（VLBI）观测时期的高精度天体测量分析。VLBI历元跨越10年的时间基线，使我们能够实现精确的源核心的自行高达每年几个微弧秒。观测是在14.4 GHz和43.1 GHz，使我们能够估计的频率核心偏移的源，其中的频谱指数分布可以计算的子集。我们研究了源位置的稳定性，通过分析基准源点（射流核心）的相对位置的变化，在十年。我们发现0.1-0.9质量的运动之间的两个时代，这意味着在喷流核心的漂移约几十微作为每年之间的近距离源。这些结果对标准的活动星系核（AGN）喷流模型（核心位置应该在时间上是稳定的）有影响。对于我们的一个源，0615+820，2010年的形态和光谱特性，以及2000年和2010年之间的相对天体测量，表明活动星系核喷流与ISM的强秒差距尺度的相互作用的可能性，一个引力透镜与~1质量的直径，或解决了大质量的双黑洞。
英文摘要：
We have carried out a high-precision astrometric analysis of two very-long-baseline-interferometry (VLBI) epochs of observation of the 13 extragalactic radio sources in the complete S5 polar cap sample. The VLBI epochs span a time baseline of 10 years and enable us to achieve precisions in the proper motions of the source cores up to a few micro-arcseconds per year. The observations were performed at 14.4 GHz and 43.1 GHz, and enable us to estimate the frequency core-shifts in a subset of sources, for which the spectral-index distributions can be computed. We study the source-position stability by analysing the changes in the relative positions of fiducial source points (the jet cores) over a decade. We find motions of 0.1-0.9 mas among close-by sources between the two epochs, which imply drifts in the jet cores of approximately a few tens of micro-as per year. These results have implications for the standard Active Galactic Nucleus (AGN) jet model (where the core locations are supposed to be stable in time). For one of our sources, 0615+820, the morphological and spectral properties in year 2010, as well as the relative astrometry between years 2000 and 2010, suggest the possibility of either a strong parsec-scale interaction of the AGN jet with the ISM, a gravitational lens with ~1 mas diameter, or a resolved massive binary black hole.
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