AMI-CL J0300+2613: a Galactic anomalous-microwave-emission ring masquerading as a galaxy cluster
Yvette C. Perrott, Therese M. Cantwell, Steve H. Carey, Patrick J., Elwood, Farhan Feroz, Keith J. B. Grainge, David A. Green, Michael P. Hobson,, Kamran Javid, Terry Z. Jin, Guy G. Pooley, Nima Razavi-Ghods, Clare Rumsey,, Richard D. E. Saunders, Anna M. M. Scaife
TL;DR
This paper reports the first blind detection of Galactic anomalous microwave emission at arcminute scales, initially mistaken for a galaxy cluster, using the AMI survey data combined with high-resolution sub-mm and IR maps.
Contribution
It reveals that a previously identified galaxy cluster candidate is actually a Galactic AME ring, demonstrating a new method for detecting AME without prior assumptions.
Findings
The feature is a dust-correlated Galactic emission ring, not a galaxy cluster.
This is the first blind detection of AME at arcminute scales.
The detection was achieved through combined radio, sub-mm, and IR observations.
Abstract
The Arcminute Microkelvin Imager (AMI) carried out a blind survey for galaxy clusters via their Sunyaev-Zel'dovich effect decrements between 2008 and 2011. The first detection, known as AMI-CL J0300+2613, has been reobserved with AMI equipped with a new digital correlator with high dynamic range. The combination of the new AMI data and more recent high-resolution sub-mm and infra-red maps now shows the feature in fact to be a ring of positive dust-correlated Galactic emission, which is likely to be anomalous microwave emission (AME). If so, this is the first completely blind detection of AME at arcminute scales.
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