An Updated Version of the Unified Radio Catalog: A Multi-Wavelength   Radio and Optical Catalog of Quasars and Radio Galaxies
  We present an updated version of the Kimball & Ivezic (2008) radio catalog using updated radio and optical data, and new low-frequency radio data. The catalog, containing millions of radio sources, was created by consolidating large-area radio and optical surveys GB6 (6cm), FIRST (20cm), NVSS (20cm), WENSS (92cm), VLSSr (4m), and SDSS DR9 (optical). The region where all surveys overlap covers 3269 square degrees in the North Galactic Cap, and contains >160,000 20-cm sources, with about 12,000 detected in all five radio surveys and over one-third detected optically. Combining parameters from the sky surveys allows easy and efficient classification by radio and optical morphology and radio spectral index. The catalog is available at http://www.aoc.nrao.edu/~akimball/radiocat.shtml . 
Amy Kimball and Zeljko Ivezic
astro-ph.GA astro-ph.CO