Radio AGN Selection and Characterization in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time

Abstract

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.

arXiv comment25 pages, 21+3 figures, 8+1 tables, MNRAS accepted (final version). The catalogues are available from https://personal.psu.edu/wnb3/xmmservs/zhu2023-tables-2023-04-12.tar.zip

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