AMI limits on 15 GHz excess emission in northern HII regions
A. M. M. Scaife, N. Hurley-Walker, M. L. Davies, P. J. Duffett-Smith,, F. Feroz, K. J. B. Grainge, D. A. Green, M. P. Hobson, T. Kaneko, A. N., Lasenby, G. G. Pooley, R. D. E. Saunders, P. F. Scott, D. J. Titterington, E., M. Waldram, J. Zwart
TL;DR
This study used the AMI telescope to observe 16 Galactic HII regions between 14.2 and 17.9 GHz, finding no significant evidence for spinning dust emission and establishing an average spectral index in this frequency range.
Contribution
The paper provides new high-frequency observations of HII regions and constrains the presence of spinning dust emission in these sources.
Findings
No significant spinning dust detected in the sample.
Measured average spectral index of 0.15±0.07 between 1.4 and 17.9 GHz.
Set limits on excess emission at 15 GHz in HII regions.
Abstract
We present observations between 14.2 and 17.9 GHz of sixteen Galactic HII regions made with the Arcminute Microkelvin Imager (AMI). In conjunction with data from the literature at lower radio frequencies we investigate the possibility of a spinning dust component in the spectra of these objects. We conclude that there is no significant evidence for spinning dust towards these sources and measure an average spectral index of 0.15+/-0.07 between 1.4 and 17.9 GHz for the sample.
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