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Constraints on spinning dust towards Galactic targets with the Very Small Array: a tentative detection of excess microwave emission towards 3C396

Scaife, Anna and Green, David A. and Battye, Richard A. and Davies, Rod D. and Davis, Richard J. and Dickinson, Clive and Franzen, Thomas and Génova-Santos, Ricardo and Grainge, Keith and Hafez, Yaser A. and Hobson, Michael P. and Lasenby, Anthony and Pooley, Guy G. and Rajguru, Nutan and Rebolo, Rafael and Rubiño-Martin, José Alberto and Saunders, Richard D. E. and Scott, Paul F. and Titterington, David and Waldram, Elizabeth and Watson, Robert A. (2007) Constraints on spinning dust towards Galactic targets with the Very Small Array: a tentative detection of excess microwave emission towards 3C396. Monthly Notices of the Royal Astronomical Society, 377 (1). L69-L73. ISSN 0035-8711. doi:10.1111/j.1745-3933.2007.00305.x.

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We present results from observations made at 33 GHz with the Very Small Array (VSA) telescope towards potential candidates in the Galactic plane for spinning dust emission. In the cases of the diffuse H ii regions LPH96 and NRAO591 we find no evidence for anomalous emission and, in combination with Effelsberg data at 1.4 and 2.7 GHz, confirm that their spectra are consistent with optically thin free–free emission. In the case of the infrared bright supernova remnant 3C396 we find emission inconsistent with a purely non-thermal spectrum and discuss the possibility of this excess arising from either a spinning dust component or a shallow spectrum pulsar wind nebula, although we conclude that the second case is unlikely given the strong constraints available from lower-frequency radio images.

Item Type:Article
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Dickinson, Clive0000-0002-0045-442X
Rebolo, Rafael0000-0003-3767-7085
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 February 16. Received 2007 February 16; in original form 2006 November 30. We thank the staff of the Mullard Radio Astronomy Observatory, the Teide Observatory and the Jodrell Bank Observatory for their invaluable assistance in the commissioning and operation of the VSA. The VSA is supported by PPARC and the IAC. AS acknowledges the support of a PPARC studentship. Part of the research described in this Letter was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. We would also like to thank the anonymous referee for his careful reading of this Letter.
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Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:radiation mechanisms : general; dust, extinction; ISM : individual : 3C396; radio continuum : ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20091113-100849088
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16698
Deposited By: Tony Diaz
Deposited On:25 Nov 2009 19:48
Last Modified:08 Nov 2021 23:29

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