标题： COSMOSOMAS实验在英仙座分子云中检测到异常微波辐射 显示英文标题

标题： Detection of anomalous microwave emission in the Perseus molecular cloud with the COSMOSOMAS experiment

摘要： 我们提供了英仙座分子云中异常微波发射的直接证据，在COSMOSOMAS实验的数据中，其光谱从11 GHz到17 GHz呈现明显的上升趋势。 通过使用WMAP地图，并结合COSMOSOMAS扫描模式扩展频率覆盖范围，我们在22 GHz处揭示了峰值通量密度为42（+/-）4 Jy，该值是在以RA = 55.4（+/-）0.1 deg和Dec = 31.8（+/-）0.1 deg（J2000）为中心、面积为1.65 x 1.0 deg的扩展区域内积分得到的。 我们在这一频率测量到的通量密度比正常的银河系发射过程（同步辐射、自由-自由辐射和热尘埃辐射）所能解释的高出将近一个数量级。 在这个位置附近发现了一个扩展的IRAS尘埃特征G159.6-18.5，但没有找到明亮且未分辨的源，这些源可能是超紧致HII区域或GHz峰值源。 从10 GHz到50 GHz的光谱密度分布可以通过包含小旋转尘埃颗粒的电偶极子发射的非常显著贡献来实现充分拟合。 显示英文摘要

摘要： We present direct evidence for anomalous microwave emission in the Perseus molecular cloud, which shows a clear rising spectrum from 11 to 17 GHz in the data of the COSMOSOMAS experiment. By extending the frequency coverage using WMAP maps convolved with the COSMOSOMAS scanning pattern we reveal a peak flux density of 42 (+/-) 4 Jy at 22 GHz integrated over an extended area of 1.65 x 1.0 deg centered on RA = 55.4 (+/-) 0.1 deg and Dec = 31.8 (+/-) 0.1 deg (J2000). The flux density that we measure at this frequency is nearly an order of magnitude higher than can be explained in terms of normal galactic emission processes (synchrotron, free-free and thermal dust). An extended IRAS dust feature G159.6-18.5 is found near this position and no bright unresolved source which could be an ultracompact HII region or gigahertz peaked source could be found. An adequate fit for the spectral density distribution can be achieved from 10 to 50 GHz by including a very significant contribution from electric dipole emission from small spinning dust grains.