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A cm-wave excess over free-free emission in planetary nebulae

Published online by Cambridge University Press:  15 December 2006

Simon Casassus ,
Lars-Åke Nyman ,
A. C. S. Readhead  and
Tim Pearson
Simon Casassus
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile email: simon@das.uchile.cl
Lars-Åke Nyman
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile
A. C. S. Readhead
Affiliation:
Onsala Space Observatory, 439 92 Onsala, Sweden
Tim Pearson
Affiliation:
Onsala Space Observatory, 439 92 Onsala, Sweden
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Abstract

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A byproduct of experiments designed to map the CMB is the detection of a new component of foreground galactic emission. The anomalous foreground at 10-30 GHz, unexplained by traditional emission mechanisms, correlates with 100$\mu$m dust emission, and is thus presumably due to dust. We present evidence obtained with the CBI and SIMBA+SEST supporting the existence of a 31GHz excess over free-free emission in PNe. Possible interpretations involve a spinning dust component or 1 mm extinction due to metallic needles.

Keywords

radiation mechanisms: generalplanetary nebulae: generalradio continuum: ISMsubmillimetre
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 375 - 376
Copyright
© 2006 International Astronomical Union