文章基本信息

标题：An anomalous dust emission component? – the observations
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作者：R.D. Davies
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：This contribution describes the observations of the anomalous emission from interstellar dust at radio and millimetre wavelengths. Complementary information is available from data sets ranging from all-sky surveys to high resolution studies of individual clouds. The large area surveys use cross-correlation or MEM techniques to infer some properties of the emission; it is the major foreground to the CMB in the frequency range 20-60 GHz, exceeding the free-free and synchrotron contributions. The physical processes involved are best confronted by studies of individual clouds. For example the anomalous dust emissivity varies from cloud to cloud at TD 1.6 and the tightest correlation is with the 25 micron emission. The spectrum of the clouds is similar to that expected for spinning dust. The first indications are that the anomalous emission is unpolarized (<5%). These properties strongly indicate that very small grains are responsible for this emission.