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A global understanding of Active Galactic Nuclei (AGN) and their hostgalaxies hinges on completing a census of AGN activity without selection biasesdown to the low-luminosity regime. Toward that goal, we identify AGN withinfaint radio populations at cosmic noon selected from new ultra-deep, highresolution imaging from the Karl G. Jansky Very Large Array at 6 and 3 GHz.These radio data are spatially coincident with the ultra-deep legacy surveys inthe GOODS-S/HUDF region, particularly the unparalleled Chandra 7 Ms X-rayimaging. Combined, these datasets provide a unique basis for a thorough censusof AGN, allowing simultaneous identification via (1) high X-ray luminosity; (2)hard X-ray spectra; (3) excess X-ray relative to 6 GHz; (4) mid-IR colors; (5)SED fitting; (6) radio excess via the radio-infrared relation; (7) flat radiospectra via multi-band radio; and (8) optical spectroscopy. We uncover AGN infully half our faint radio sample, indicating a source density of one AGNarcmin$^{-2}$, with a similar number of radio-undetected AGN identified viaX-ray over the same area. Our radio-detected AGN are majority radio-quiet, withradio emission consistent with being powered predominantly by star formation.Nevertheless, we find AGN radio signatures in our sample: $\sim12\%$ with radioexcess indicating radio-loud activity and $\sim16\%$ of radio-quiet AGNcandidates with flat or inverted radio spectra. The latter is a lower limit,pending our upcoming deeper 3 GHz survey. Finally, despite these extensivedatasets, this work is likely still missing heavily obscured AGN. We discuss indetail this elusive population and the prospects for completing our AGN censuswith JWST/MIRI.

Completing the Census of AGN in GOODS-S/HUDF: New Ultra-Deep Radio Imaging and Predictions for JWST