从NVSS看高光度源的旋转测量
The rotation measures of high luminosity sources as seen from the NVSS
摘要：
我们重新分析的子集的法拉第旋转措施的数据从NRAO VLA巡天目录的红移和光谱指数的信息是可用的，为了更好地阐明这些观测值之间的关系。我们根据射电光度将这个子集一分为二，发现一旦减去银河系的规则场，功率更高的源具有系统更高的剩余旋转测量。与低功率源相反，这种旋转测量值远高于银河系湍流场和测量误差造成的方差。随着能量阈值变得更有限制性，该效果更明显。如果这两组合并，观察到一个明显的演化与红移的旋转措施，但我们的分析表明，这可以被解释为一个人工制品的不同的内在性质的明亮的来源，通常在更大的距离观察。
英文摘要：
We re-analyse the subset of the Faraday rotation measures data from the NRAO VLA Sky Survey catalogue for which redshift and spectral index information is available, in order to better elucidate the relations between these observables. We split this subset in two based on their radio luminosity, and find that higher power sources have a systematically higher residual rotation measure, once the regular field of the Milky Way is subtracted. This rotation measure stands well above the variances due to the turbulent field of our Galaxy and measurement errors, contrarily to low power sources. The effect is more pronounced as the energy threshold becomes more restrictive. If the two sets are merged one observes an apparent evolution of rotation measure with redshift, but our analysis shows that this can be interpreted as an artifact of the different intrinsic properties of brighter sources that are typically observed at larger distances.
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