The State-of-Play of Anomalous Microwave Emission (AME) research

Clive Dickinson, Y. Ali-Haïmoud, A. Barr, E. S. Battistelli, A. Bell, L. Bernstein, S. Casassus, K. Cleary, B. T. Draine, R. Génova-Santos, S. E. Harper, B. Hensley, J. Hill-Valler, Thiem Hoang, F. P. Israel, L. Jew, A. Lazarian, J. P. Leahy, J. Leech, C. H. López-CaraballoI. McDonald, E. J. Murphy, T. Onaka, R. Paladini, M. W. Peel, Y. Perrott, F. Poidevin, A. C.S. Readhead, J. A. Rubiño-Martín, A. C. Taylor, C. T. Tibbs, M. Todorović, Matias Vidal

    Research output: Contribution to journalReview articlepeer-review

    Abstract

    Anomalous Microwave Emission (AME) is a component of diffuse Galactic radiation observed at frequencies in the range ≈ 10–60 GHz. AME was first detected in 1996 and recognised as an additional component of emission in 1997. Since then, AME has been observed by a range of experiments and in a variety of environments. AME is spatially correlated with far-IR thermal dust emission but cannot be explained by synchrotron or free–free emission mechanisms, and is far in excess of the emission contributed by thermal dust emission with the power-law opacity consistent with the observed emission at sub-mm wavelengths. Polarization observations have shown that AME is very weakly polarized (≲ 1 %). The most natural explanation for AME is rotational emission from ultra-small dust grains (“spinning dust”), first postulated in 1957. Magnetic dipole radiation from thermal fluctuations in the magnetization of magnetic grain materials may also be contributing to the AME, particularly at higher frequencies (≳ 50 GHz). AME is also an important foreground for Cosmic Microwave Background analyses. This paper presents a review and the current state-of-play in AME research, which was discussed in an AME workshop held at ESTEC, The Netherlands, June 2016.

    Original languageEnglish
    Pages (from-to)1-28
    Number of pages28
    JournalNew Astronomy Reviews
    Volume80
    Early online date23 Feb 2018
    DOIs
    Publication statusPublished - Feb 2018

    Keywords

    • Cosmic microwave background
    • Diffuse radiation
    • Interstellar medium
    • Radiation mechanisms
    • Radio continuum
    • Spinning dust

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