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Constraints on Free-Free Emission from Anomalous Microwave Emission Sources in the Perseus Molecular Cloud

Tibbs, C. T. and Paladini, R. and Dickinson, C. and Mason, B. S. and Casassus, S. and Cleary, K. and Davies, R. D. and Davis, R. J. and Watson, R. A. (2013) Constraints on Free-Free Emission from Anomalous Microwave Emission Sources in the Perseus Molecular Cloud. Astrophysical Journal, 770 (2). Art. No. 122. ISSN 0004-637X. doi:10.1088/0004-637X/770/2/122.

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We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with the Very Small Array. With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3σ upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency emission, hence confirming its anomalous nature.

Item Type:Article
Related URLs:
URLURL TypeDescription
Paladini, R.0000-0002-5158-243X
Dickinson, C.0000-0002-0045-442X
Additional Information:© 2013 American Astronomical Society. Received 2012 November 5; accepted 2013 April 15; published 2013 June 4. We thank A. Noriega-Crespo and S. Carey for stimulating discussions. We also thank the referee for providing detailed comments that have 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. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Funding AgencyGrant Number
NASA/ADP ROSES-200909-ADP09-0059
STFC Advanced FellowshipUNSPECIFIED
European Union (EU) Marie-Curie IRG FP7UNSPECIFIED
Subject Keywords:dust, extinction; ISM: clouds; ISM: general; ISM: individual objects (Perseus molecular cloud); radio continuum: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20130717-111400136
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Official Citation:Constraints on Free-Free Emission from Anomalous Microwave Emission Sources in the Perseus Molecular Cloud C. T. Tibbs et al. 2013 ApJ 770 122
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39418
Deposited On:17 Jul 2013 20:11
Last Modified:09 Nov 2021 23:44

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