英仙座地区异常微波辐射的VSA观测
VSA Observations of the Anomalous Microwave Emission in the Perseus Region
摘要:
英仙座地区的尘埃特征G159.6- 18.5以前曾在$\approx$ 1 $^{\circ}$的角尺度上用宇宙物质实验\citep{Watson:05}观测过,并发现其具有异常的微波发射。我们提出了新的观察,这种尘埃功能,在33 GHz的甚小阵列(VSA)进行,以帮助增加这种异常发射的性质的理解。在用VSA($\approx$ 10 - 40 $^{\prime}$)观察的角标度上,G159.6- 18.5由五个不同的组分组成,每个组分都进行了单独分析。所有这五个组件被发现在33 GHz时表现出过量的发射,并被发现与远红外发射高度相关。我们提供的证据表明,这些紧凑的组件都有异常发射,这是一致的电偶极子发射非常小,快速旋转的尘埃颗粒。这些成分对COSMOSOMAS探测到的扩散扩展发射的通量密度贡献了$\approx$ 10%,并且发现它们具有相似的无线电发射率。
英文摘要:
The dust feature G159.6--18.5 in the Perseus region has previously been observed with the COSMOSOMAS experiment \citep{Watson:05} on angular scales of $\approx$ 1$^{\circ}$, and was found to exhibit anomalous microwave emission. We present new observations of this dust feature, performed with the Very Small Array (VSA) at 33 GHz, to help increase the understanding of the nature of this anomalous emission. On the angular scales observed with the VSA ($\approx$ 10 -- 40$^{\prime}$), G159.6--18.5 consists of five distinct components, each of which have been individually analysed. All five of these components are found to exhibit an excess of emission at 33 GHz, and are found to be highly correlated with far-infrared emission. We provide evidence that each of these compact components have anomalous emission that is consistent with electric dipole emission from very small, rapidly rotating dust grains. These components contribute $\approx$ 10 % to the flux density of the diffuse extended emission detected by COSMOSOMAS, and are found to have a similar radio emissivity.
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