A CASE AGAINST SPINNING PAHS AS THE SOURCE OF THE ANOMALOUS MICROWAVE EMISSION
A CASE AGAINST SPINNING PAHS AS THE SOURCE OF THE ANOMALOUS MICROWAVE EMISSION
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DOI：
10.3847/0004-637x/827/1/45
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Brandon S. Hensley;Brandon S. Hensley;B. Draine;A. Meisner
中科院分区：
文献类型：
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作者：
Brandon S. Hensley;Brandon S. Hensley;B. Draine;A. Meisner
我们使用微波天空成分分离产生的异常微波发射（AME）的全天空地图来研究AME与银河尘埃属性之间的相关性。我们发现，虽然AME是高度相关的所有示踪剂的尘埃排放，最好的预测AME强度是尘埃辐射。每尘埃辐射的AME强度的波动与多环芳烃（PAHs）的排放波动无关，怀疑AME和PAHs之间的关联。多环芳烃的丰度与尘埃光学厚度和尘埃辐射强度有很强的相关性，这与低密度区多环芳烃的破坏是一致的。我们发现，AME强度增加，增加辐射场强度，在方差与旋转尘埃假说的预测。最后，每尘埃辐射的AME的温度依赖性不利于解释的AME热发射。重新考虑其他AME载体，如超小硅酸盐，和其他发射机制，如磁偶极子发射，是必要的。
We employ an all-sky map of the anomalous microwave emission (AME) produced by component separation of the microwave sky to study correlations between the AME and Galactic dust properties. We find that while the AME is highly correlated with all tracers of dust emission, the best predictor of the AME strength is the dust radiance. Fluctuations in the AME intensity per dust radiance are uncorrelated with fluctuations in the emission from polycyclic aromatic hydrocarbons (PAHs), casting doubt on the association between AME and PAHs. The PAH abundance is strongly correlated with the dust optical depth and dust radiance, consistent with PAH destruction in low density regions. We find that the AME intensity increases with increasing radiation field strength, at variance with predictions from the spinning dust hypothesis. Finally, the temperature dependence of the AME per dust radiance disfavors the interpretation of the AME as thermal emission. A reconsideration of other AME carriers, such as ultrasmall silicates, and other emission mechanisms, such as magnetic dipole emission, is warranted.