摘要: The Australia Telescope Large Area Survey (ATLAS) and the VLA survey in the
XMM-LSS/VIDEO deep field provide deep ($\approx 15$ ${\mu}$Jybeam$^{-1}$) and
high-resolution ($\approx$ 4.5--8 arcsec) radio coverage of the three XMM-SERVS
fields (W-CDF-S, ELAIS-S1, and XMM-LSS). These data cover a total sky area of
11.3 deg$^2$ and contain $\approx 11000$ radio components. Furthermore, about
3~deg$^2$ of the XMM-LSS field also has deeper MIGHTEE data that achieve a
median RMS of 5.6 ${\mu}$Jy beam$^{-1}$ and detect more than 20000 radio
sources. We analyze all these radio data and find source counterparts at other
wavebands utilizing deep optical and IR surveys. The nature of these radio
sources is studied using radio-band properties (spectral slope and morphology),
and the IR-radio correlation. %and spectral energy distribution. Radio AGNs are
selected and compared with those selected using other methods (e.g. X-ray). We
found 1656 new AGNs that were not selected using X-ray and/or MIR methods. We
constrain the FIR-to-UV SEDs of radio AGNs using {\sc cigale} and investigate
the dependence of radio AGN fraction upon galaxy stellar mass and
star-formation rate.