Radio properties of z>=1 galaxies

The vast majority of observed high-redshift AGNs are quasars, and there are very few radio galaxies at redshifts z>3. We present the radio properties of 173 sources optically identified with radio galaxies at z>1 with flux densities S_1.4_>20mJy.

Literature data were collected for compilation of broadband radio spectra, estimation of radio variability, radio luminosity, and radio loudness. Almost 60% of the galaxies have steep or ultra-steep radio spectra; 22% have flat, inverted, upturn, and complex spectral shapes, and 18% have peaked spectra (PS). The majority of the PS sources in the sample (20/31) are megahertz-peaked spectrum sources candidates, i.e. possibly very young and compact radio galaxies.