Microwave observations of spinning dust emission in NGC6946
Abstract
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.
Keywords
Cite
@article{arxiv.1004.4897,
title = {Microwave observations of spinning dust emission in NGC6946},
author = {Anna M. M. Scaife and Bojan Nikolic and David A. Green and Rainer Beck and Matthew L. Davies and Thomas M. O. Franzen and Keith J. B. Grainge and Michael P. Hobson and Natasha Hurley-Walker and Anthony N. Lasenby and Malak Olamaie and Guy G. Pooley and Carmen Rodriguez-Gonzalvez and Richard D. E. Saunders and Paul F. Scott and Timothy W. Shimwell and David J. Titterington and Elizabeth M. Waldram and Jonathan T. L. Zwart},
journal= {arXiv preprint arXiv:1004.4897},
year = {2015}
}
Comments
submitted MNRAS