论文标题
离散源对144 MHz的天空温度的贡献
The contribution of discrete sources to the sky temperature at 144 MHz
论文作者
论文摘要
近年来，阿加拉河外无线电背景的水平已成为极大的兴趣点，有些论点指向全新的宇宙学同步物背景。已知的离散源人群对天空温度的贡献是该讨论的关键。由于在宇宙微波背景上有多余的陡峭光谱指数，因此最好以信号最强的低频进行研究。低频阵列（Lofar）宽而深的天空调查为我们提供了144 MHz离散的离散外层流源的最佳限制，尤其是使我们能够包括从弥漫性，低表面 - 光线性发射中的贡献，这在先前的工作中无法充分考虑。我们表明，即使有了这些新数据，已知来源仍然只能占Lofar频率下估计的估计的天空温度的四分之一。
In recent years, the level of the extragalactic radio background has become a point of considerable interest, with some lines of argument pointing to an entirely new cosmological synchrotron background. The contribution of the known discrete source population to the sky temperature is key to this discussion. Because of the steep spectral index of the excess over the cosmic microwave background, it is best studied at low frequencies where the signal is strongest. The Low-Frequency Array (LOFAR) wide and deep sky surveys give us the best constraints yet on the contribution of discrete extragalactic sources at 144 MHz, and in particular allow us to include contributions from diffuse, low-surface-brightness emission that could not be fully accounted for in previous work. We show that, even with these new data, known sources can still only account for around a quarter of the estimated extragalactic sky temperature at LOFAR frequencies.
