The cm-wave continuum in PNe

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

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1484c&link_type=abstract

ATNF proposal C1705, Semester: April, 2008

Physics

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 may perhaps be due to electric dipole radiation from spinning very small grains, or `spinning dust'. The cm-wave excess confronts the free-free paradigm in PNe. It implies that the level of free-free emission, in the optically thin regime above 10GHz, was overestimated by up to 100%, resulting in spurious diagnostics of physical conditions. The evidence for the cm-wave excess in PNe stems from a CBI/SIMBA survey of ~20 objects, highlighting a systematic 250~GHz deficit from the level of 30GHz emission. We have selected the best candidates for an exhaustive continuum study with ATCA. Here we propose to acquire W-band flux densities in 4 selected PNe.

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