论文标题
低（ER）28个候选大型同步源的频率随访
Low(er) frequency follow-up of 28 candidate, large-scale synchrotron sources
论文作者
论文摘要
我们跟进Vacca等人的报告。 （2018年）28个候选大规模弥漫性同步源，以8°$ \ times $ 8°的天空区域（以RA 5H0M0S为中心）。这些来源最初是在1.4 GHz观察到的，使用单次撒丁岛射电望远镜（SRT）和档案NRAO VLA SKY SUMPER（NVSS）数据的组合。它们位于Z $ \ $ \ $ 0.1的9个大型星系簇的区域，是首次检测Synchrotron Cosmic Web细丝的候选人。我们尝试使用Murchison Widefield阵列（MWA）和887 MHz验证以下频率观测值的这些候选源，并使用澳大利亚平方公里阵列pathfinder（Askap）进行887 MHz。我们使用一种新颖的技术来计算这些仪器的表面亮度灵敏度，以表明我们的较低频率观察，尤其是通过ASKAP的观测值，非常适合检测大规模，扩展的同步加速器发射。尽管如此，我们被迫得出结论，这些来源都不可能是与宇宙网络相关的同步。
We follow up on a report by Vacca et al. (2018) of 28 candidate large-scale diffuse synchrotron sources in an 8°$\times$8° area of the sky (centred at RA 5h0m0s Dec 5°48'0''). These sources were originally observed at 1.4 GHz using a combination of the single-dish Sardinia Radio Telescope (SRT) and archival NRAO VLA Sky Survey (NVSS) data. They are in an area with nine massive galaxy clusters at z $\approx$ 0.1, and are candidates for the first detection of filaments of the synchrotron cosmic web. We attempt to verify these candidate sources with lower frequency observations at 154 MHz with the Murchison Widefield Array (MWA) and at 887 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP). We use a novel technique to calculate the surface brightness sensitivity of these instruments to show that our lower frequency observations, and in particular those by ASKAP, are ideally suited to detect large-scale, extended synchrotron emission. Nonetheless, we are forced to conclude that none of these sources are likely to be synchrotron in origin or associated with the cosmic web.
