Microwave observations of spinning dust emission in NGC6946

Details Microwave observations of spinning dust emission in NGC6946 Microwave observations of spinning dust emission in NGC6946

2010-04-27

arxiv.org/abs/1004.4897v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

submitted MNRAS

Scientific paper

We report new cm-wave measurements at five frequencies between 15 and 18GHz of the continuum emission from the reportedly anomalous "region 4" of the nearby galaxy NGC6946. We find that the emission in this frequency range is significantly in excess of that measured at 8.5GHz, but has a spectrum from 15-18GHz consistent with optically thin free-free emission from a compact HII region. In combination with previously published data we fit four emission models containing different continuum components using the Bayesian spectrum analysis package radiospec. These fits show that, in combination with data at other frequencies, a model with a spinning dust component is slightly preferred to those that possess better-established emission mechanisms.

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