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Fig. 1

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Source map for the ERCSC and follow-up studies in Galactic coordinates. The dots mark positions of ERCSC 30 GHz sources at high Galactic latitude (| b| > 5°), with a  >1 Jy cut applied, as at this level the sample is essentially complete. This is a total of 563 sources. Our study in the northern hemisphere includes 89 sources, the bulk of which are selected to have S37   GHz > 1 Jy. For comparison, we plot the S20   GHz > 1 Jy sources from the AT20G survey (Murphy et al. 2010) in the southern hemisphere. All of these are part of the PACO project, where sources  >500 mJy make up the PACO bright sample (Massardi et al. 2011). A dotted line separates the sky into the region covered by our study and that covered by the PACO project. Altogether, in the  >1 Jy regime, nearly 50% of the ERCSC 30 GHz sources have ground-based, near-simultaneous follow-up.

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