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

Dickinson, Clive and Cleary, K. and Hensley, B. and Readhead, A. C. S. and Paladini, R. (2018) The State-of-Play of Anomalous Microwave Emission (AME) Research. New Astronomy Reviews, 80 . pp. 1-28. ISSN 1387-6473.

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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.

Item Type:Article
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URLURL TypeDescription
Dickinson, Clive0000-0002-0045-442X
Hensley, B.0000-0001-7449-4638
Readhead, A. C. S.0000-0001-9152-961X
Paladini, R.0000-0002-5158-243X
Additional Information:© 2018 Elsevier B.V. Received 10 November 2017, Accepted 22 February 2018, Available online 23 February 2018. We thank Chris Tibbs and colleagues at ESTEC for organising the 3rd AME workshop, held 23–24 June 2016 at ESTEC, Noordwijk, The Netherlands. CD acknowledges support from an STFC Consolidated Grants (ST/P000649/1) and an ERC Starting (Consolidator) Grant (no. 307209). BTD was supported in part by NSF grant AST-1408723. TH acknowledges the support by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (2017R1D1A1B03035359). CTT acknowledges an ESA Research Fellowship. ESB acknowledges support from Sapienza Ateneo projects 2016. AB and TO are supported by JSPS and CNRS under the Japan–France Research Cooperative Program. CHLC thanks CONICYT for grant Anillo ACT-1417. MP acknowledges grant #2015/19936-1, São Paulo Research Foundation (FAPESP). YCP acknowledges support from a Trinity College JRF. FP thanks the European Commission under the Marie Sklodowska-Curie Actions within the H2020 program, Grant Agreement number: 658499-PolAME-H2020-MSCA-IF-2014. JARM acknowledges the funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement number 687312 (RADIOFOREGROUNDS). This work has been partially funded by the Spanish Ministry of Economy and Competitiveness (MINECO) under the project AYA2014-60438-P. MV acknowledges support from FONDECYT through grant 3160750. We thank George Bendo and Tim Pearson for helpful discussions while preparing the draft. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/P000649/1
European Research Council (ERC)307209
National Research Foundation of Korea2017R1D1A1B03035359
European Space Agency (ESA)UNSPECIFIED
Sapienza AteneoUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)Anillo ACT-1417
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2015/19936-1
Trinity CollegeUNSPECIFIED
Marie Curie Fellowship658499
European Research Council (ERC)687312
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2014-60438-P
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3160750
Subject Keywords:Radiation mechanisms; Spinning dust; Diffuse radiation; Radio continuum; Cosmic microwave background; Interstellar medium
Record Number:CaltechAUTHORS:20180227-084611974
Persistent URL:
Official Citation: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-Caraballo, I. 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, The State-of-Play of Anomalous Microwave Emission (AME) research, New Astronomy Reviews, Volume 80, 2018, Pages 1-28, ISSN 1387-6473, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84965
Deposited By: Tony Diaz
Deposited On:27 Feb 2018 19:20
Last Modified:09 Mar 2020 13:18

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