The cm-wave continuum in compact PNe

Details The cm-wave continuum in compact PNe The cm-wave continuum in compact PNe

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007atnf.prop.1083c&link_type=abstract

ATNF proposal C1705, Semester: October, 2007

Physics

Stellar, Galactic, Atca

Scientific paper

Excess 20-30GHz emission, above that expected from synchrotron or free-free templates and sub-millimetre dust emission, has been reported in HII regions, planetary nebulae (PNe), dark clouds and in the ISM at large. The excess has been modelled in terms of dipole radiation from spinning very small grains, or `spinning dust'. The cm-wave excess confronts the free-free paradigm in PNe. A CBI/SIMBA survey of 22 objects highlighted a systematic 250~GHz deficit from the level of optically thin free-free extrapolated from 30GHz. Although we find a correlation between the fractional cm-wave excess and the ratio IRAS100um/5GHz, the low-frequency data rule out existing spinning dust models. We have selected the best candidates for an exhaustive continuum study. ATCA can provide adequately sampled spectral energy distributions with which to test various interpretations of the cm-wave excess in PNe.

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