Investigation of Blazars in UV and in radio

Blazars are the most energetic sources in the Universe, but have not been thoroughly and homogeneously investigated in all spectral ranges, particularly in UV. We carried out cross-correlations of BZCAT v.5 Catalogue with UV (GALEX) and radio catalogues, in order to find a connection between the fluxes in UV with optical and radio ranges. BZCAT v.5 catalogue includes 3561 objects. For these objects, we found 1841 associations from the GALEX catalogue (providing Far UV – FUV and Near UV – NUV), from which 999 associations from FIRST (providing fluxes at 1400 MHz) and 855 associations from SDSS (providing photometry at ugriz bands and medium dispersion spectroscopy for limited number of objects). Our main task is to understand which type of blazars (BZB, BZG, BZQ, and BZU) are more powerful sources in the UV range. We calculated UV/radio and UV/opt flux ratios and analyzed them to understand possible connections between radio, optical, and UV ranges. Having our new optical classification of blazars by activity types, we also analyzed the UV/radio/optical properties of the sample across their activity types.