在SKA模拟天空中暗射电星系核发射的普遍性
The prevalence of core emission in faint radio galaxies in the SKA Simulated Skies
摘要：
经验模拟的基础上外推从完善的低频（$< 5$ GHz）的调查未能准确地模拟微弱的，高频（$>10$ ~GHz）的源人口，他们低估了观测到的源的数量的一个因素，低于$S_{18~\rm GHz} = 10$ mJy和未能再现观测到的光谱指数分布。我们认为，这是因为在模拟中没有正确地模拟微弱的射电星系，并表明通过在SKA模拟天空中的FRI源中添加平谱核心分量，可以再现所观察到的15 GHz源计数。我们发现，观测结果是最好的匹配，假设总的1.4 GHz的流量密度的一部分，起源于核心的1.4 GHz的光度变化，源与1.4 GHz的光度$< 10^{25} \rm W \, Hz^{-1}$需要一个核心部分$\sim 0.3$，而更多的发光源需要一个小得多的核心部分$5 \times 10^{-4}$。原始模拟中未包括的具有高核心分数的低光度FRI源可能等同于最近研究中发现的紧凑的“FR 0”源。
英文摘要：
Empirical simulations based on extrapolations from well-established low-frequency ($< 5$ GHz) surveys fail to accurately model the faint, high frequency ($>10$~GHz) source population; they under-predict the number of observed sources by a factor of two below $S_{18~\rm GHz} = 10$ mJy and fail to reproduce the observed spectral index distribution. We suggest that this is because the faint radio galaxies are not modelled correctly in the simulations and show that by adding a flat-spectrum core component to the FRI sources in the SKA Simulated Skies, the observed 15-GHz source counts can be reproduced. We find that the observations are best matched by assuming that the fraction of the total 1.4-GHz flux density which originates from the core varies with 1.4-GHz luminosity; sources with 1.4-GHz luminosities $< 10^{25} \rm W \, Hz^{-1}$ require a core fraction $\sim 0.3$, while the more luminous sources require a much smaller core fraction of $5 \times 10^{-4}$. The low luminosity FRI sources with high core fractions which were not included in the original simulation may be equivalent to the compact `FR0' sources found in recent studies.
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