AMI-CL J0300+2613: a Galactic anomalous-microwave-emission ring masquerading as a galaxy cluster
Feroz, Farhan; Grainge, Keith J. B.; Hobson, Michael P.; Pooley, Guy G.; Saunders, Richard D. E.; Scaife, Anna M. M.; Scott, Paul F.; Shimwell, Timothy W.; Titterington, David J.; Waldram, Elizabeth M.; Green, David A.; Perrott, Yvette C.; Schammel, Michel P.; Cantwell, Therese M.; Carey, Steve H.; Elwood, Patrick J.; Javid, Kamran; Jin, Terry Z.; Razavi-Ghods, Nima; Rumsey, Clare
United Kingdom, Netherlands
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 infrared 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.