The Planck Early Release Compact Source Catalogue includes 26 sources with no obvious matches in other radio catalogues (of primarily extragalactic sources). Here we present observations made with the Arcminute Microkelvin Imager Small Array (AMI SA) at 15.75 GHz of the eight of the unmatched sources at declination > +10 degrees. Of the eight, four are detected and are associated with known objects. The other four are not detected with the AMI SA, and are thought to be spurious.
@article{arxiv.1110.1454,
title = {AMI observations of unmatched Planck ERCSC LFI sources at 15.75 GHz},
author = {AMI Consortium and : and Yvette C. Perrott and David A. Green 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 Rodríguez-Gonzálvez and Richard D. E. Saunders and Anna M. M. Scaife and Michel P. Schammel and Paul F. Scott and Timothy W. Shimwell and David J. Titterington and Elizabeth M. Waldram},
journal= {arXiv preprint arXiv:1110.1454},
year = {2012}
}