VizieR Online Data Catalog: ROXA: multi-frequency large sample of blazars (Turriziani+, 2007)

A list of 816 objects among which 510 are confirmed blazars. The selection method consists in three steps: 1) a first cross-correlation between radio and X-ray surveys (the NRAO VLA Sky Survey, ATCAPMN (ATCA catalogue of compact PMN sources) and ROSAT All Sky Survey; 2) for each radio/X-ray match, optical magnitudes were retrieved from the Guide Star Catalog; 3) for all radio/optical/X-ray matches we calculated the X-ray to optical (alpha_ox) and radio to optical (alpha_ro) spectral slopes and took only sources with alpha_ox and alpha_ro values within the blazar area. For each object, redshift, B and G magnitudes, radio flux at 1.4GHz and at 5GHz, X-ray flux, FX/Fr ratio, X-ray luminosity, radio luminosity, CaH&K break and classification are given.

(1 data file).