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arxiv: 1709.05136 · v1 · pith:7MGUEDXEnew · submitted 2017-09-15 · 🌌 astro-ph.GA

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
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Kamran Javid Terry Z. Jin Guy G. Pooley Nima Razavi-Ghods Clare Rumsey Richard D. E. Saunders Anna M. M. Scaife Michel P. Schammel Paul F. Scott Timothy W. Shimwell David J. Titterington Elizabeth M. Waldram
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keywords ami-clarcminuteblinddetectionemissionfirstgalacticgalaxy
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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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