限制高频峰值的性质。I.光谱变异性
Constraining the nature of High Frequency Peakers. I. The spectral variability
摘要：
我们调查了51个候选高频峰（HFPs）的光谱特征，从“明亮”的HFP样本，以确定每个对象的性质，并获得一个较小的样本，真正的年轻射电源。在不同时期同时进行的多频甚小线阵观测已被用来探测通量密度和频谱形状的变化，以便准确地确定污染物的位置，因为年轻的射电源在如此短的时间尺度上预计不会有很大的变化。从光谱变化的分析，我们发现13个污染物的对象，11个类星体，1 BL Lac，和1个身份不明的对象，我们已经拒绝了候选年轻的射电源的样本。第一次和最近一次观测之间的6年时间不足以探测到真正的、不变的、年轻的射电源的整个频谱的任何实质性演变。如果我们也考虑pc尺度的信息，我们发现，我们观察到的总的无线电频谱是不同区域（瓣，热点，核心，喷流）的频谱叠加的结果，而不是一个单一的均匀的无线电分量。这表明，在相当常见的情况下，即使在高分辨率尺度上，射电源结构也在确定频谱形状方面起着相关的作用。
英文摘要：
We investigate the spectral characteristics of 51 candidate High Frequency Peakers (HFPs), from the ``bright'' HFP sample, in order to determine the nature of each object, and to obtain a smaller sample of genuine young radio sources. Simultaneous multi-frequency VLA observations carried out at various epochs have been used to detect flux density and spectral shape variability in order to pinpoint contaminant objects, since young radio sources are not expected to be significantly variable on such a short time-scale. From the analysis of the spectral variability we find 13 contaminant objects, 11 quasars, 1 BL Lac, and 1 unidentified object, which we have rejected from the sample of candidate young radio sources. The 6 years elapsed between the first and latest observing run are not enough to detect any substantial evolution of the overall spectrum of genuine, non variable, young radio sources. If we also consider the pc-scale information, we find that the total radio spectrum we observe is the result of the superposition of the spectra of different regions (lobes, hot-spots, core, jets), instead of a single homogeneous radio component. This indicates that the radio source structure plays a relevant role in determining the spectral shape also in the rather common case in which the morphology appears unresolved even on high-resolution scales.
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