We have selected a field from the VLA FIRST Survey which is typical in all aspects except one: it contains a bright, but extremely compact VLBI calibrator - J1159+291. 127 unresolved FIRST sources with $S_{ FIRST}\ge 10$ mJy lie within $2.5^{ \circ}$ of this calibrator. $\lambda 6$ cm MERLIN observations with a resolution $\sim 60$ mas detect around half the sources. These detections form the basis of a sample of faint but compact radio sources which are ideally suited to follow-up VLBI observations.
Categories: astro-ph