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arXiv 1601.00282astro-ph.GAastro-ph.CO
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10C继续:15.7 GHz的更深入无线电调查

10C continued: a deeper radio survey at 15.7 GHz

I. H. Whittam, J. M. Riley, D. A. Green, M. L. Davies, T. M. O. Franzen, C. Rumsey, M. P. Schammel, E. M. Waldram

摘要:

我们提出了深15.7 GHz的观测与弧分钟Microkelvin成像仪大阵列在两个领域以前观察到的第十届剑桥(10C)调查的一部分。这些观测允许源计数被计算到0.1 mJy,比10C调查所实现的深5倍。新的源计数与10C源计数的外推拟合一致,并且没有显示计数变陡或变平的证据。因此,没有证据表明在15.7 GHz的通量密度高于0.1 mJy的情况下会出现一个重要的新的源(例如恒星形成),我们预计恒星形成星系开始贡献的通量密度水平。与de Zotti等人的模型和SKADS模拟天空的比较表明,在这个通量密度水平上,它们都低估了观测到的源的数量。我们认为,这是由于射电星系的平谱核心贡献更显着的计数比预测的模型。

英文摘要:

We present deep 15.7-GHz observations made with the Arcminute Microkelvin Imager Large Array in two fields previously observed as part of the Tenth Cambridge (10C) survey. These observations allow the source counts to be calculated down to 0.1 mJy, a factor of five deeper than achieved by the 10C survey. The new source counts are consistent with the extrapolated fit to the 10C source count, and display no evidence for either steepening or flattening of the counts. There is thus no evidence for the emergence of a significant new population of sources (e.g. starforming) at 15.7 GHz flux densities above 0.1 mJy, the flux density level at which we expect starforming galaxies to begin to contribute. Comparisons with the de Zotti et al. model and the SKADS Simulated Sky show that they both underestimate the observed number of sources by a factor of two at this flux density level. We suggest that this is due to the flat-spectrum cores of radio galaxies contributing more significantly to the counts than predicted by the models.

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