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Constraints on Free-Free Emission from Anomalous Microwave Emission Sources in the Perseus Molecular Cloud

机译:英仙座分子云中异常微波发射源的自由自由发射约束

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摘要

We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with the Very Small Array. With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3σ upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency emission, hence confirming its anomalous nature.
机译:我们介绍了使用格林银行望远镜在1.4和5 GHz的三个条带上进行的观测,这与先前在33 GHz的珀尔修斯分子云中用超小型阵列确定的微波异常发射特征相吻合。通过这些观察,我们确定了低频(〜1-5 GHz)发射的水平。我们未在这些区域中检测到任何明显的扩展发射,而是针对三个条带在33 GHz时计算出的自由自由发射比例的保守3σ上限分别为27%,12%和18%,表明1.4和5 GHz的发射不能解释33 GHz的发射。此外,我们发现低频发射与在33 GHz处观察到的发射在空间上不相关。这些结果表明,在33 GHz的英仙座分子云中观察到的发射确实比低频发射过量,因此证实了其异常性质。

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