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AMI Observations of the Anomalous Microwave Emission in the Perseus Molecular Cloud

Tibbs, C. T. and Scaife, A. M. M. and Dickinson, C. and Paladini, R. and Davies, R. D. and Davis, R. J. and Grainge, K. J. B. and Watson, R. A. (2013) AMI Observations of the Anomalous Microwave Emission in the Perseus Molecular Cloud. Astrophysical Journal, 768 (2). Art. No. 98. ISSN 0004-637X. doi:10.1088/0004-637X/768/2/98.

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We present observations of the known anomalous microwave emission region, G159.6–18.5, in the Perseus molecular cloud at 16 GHz performed with the Arcminute Microkelvin Imager Small Array. These are the highest angular resolution observations of G159.6–18.5 at microwave wavelengths. By combining these microwave data with infrared observations between 5.8 and 160 μm from the Spitzer Space Telescope, we investigate the existence of a microwave-infrared correlation on angular scales of ~2'. We find that the overall correlation appears to increase toward shorter infrared wavelengths, which is consistent with the microwave emission being produced by electric dipole radiation from small, spinning dust grains. We also find that the microwave-infrared correlation peaks at 24 μm (6.7σ), suggesting that the microwave emission is originating from a population of stochastically heated small interstellar dust grains rather than polycyclic aromatic hydrocarbons.

Item Type:Article
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URLURL TypeDescription Paper
Dickinson, C.0000-0002-0045-442X
Paladini, R.0000-0002-5158-243X
Additional Information:© 2013 American Astronomical Society. Received 2012 November 1; accepted 2013 March 12; published 2013 April 18. We thank A. Noriega-Crespo and S. Carey for stimulating discussions. We also thank the referee for providing detailed comments that have substantially improved the content of this paper. This work has been performed within the framework of a NASA/ADP ROSES-2009 grant, No. 09-ADP09-0059. C.D. acknowledges support from an STFC Advanced Fellowship and an EU Marie-Curie IRG grant under the FP7. We thank the staff of the Mullard Radio Astronomy Observatory for their invaluable assistance in the commissioning and operation of AMI, which is supported by Cambridge University and the STFC.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Cambridge UniversityUNSPECIFIED
Subject Keywords:dust, extinction; Infrared: ISM; ISM: clouds; ISM: general; ISM: individual objects (G159.6-18.5); Radio continuum: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20130408-093637967
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Official Citation:AMI Observations of the Anomalous Microwave Emission in the Perseus Molecular Cloud C. T. Tibbs, A. M. M. Scaife, C. Dickinson, R. Paladini, R. D. Davies, R. J. Davis, K. J. B. Grainge, and R. A. Watson doi:10.1088/0004-637X/768/2/98
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37800
Deposited By: Ruth Sustaita
Deposited On:08 Apr 2013 16:59
Last Modified:09 Nov 2021 23:31

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