Search for Compact Extragalactic Radio Sources Near Massive Star Forming   Regions
  We have used the Very Large Array to search for compact milliarcsecond-size radio sources near methanol masers in high-mass star-forming regions. Such sources are required for Very Long Baseline Interferometry phase-referencing observations. We conducted pointed observations of 234 compact sources found in the NVSS survey and find 92 sources with unresolved components and synchrotron spectral indexes. These sources are likely the cores of AGNs and, thus, good candidates for astrometric calibrators. 
Y. Xu, M. J. Reid, K. M. Menten, and X. W. Zheng