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The Australia Telescope Hubble Deep Field-South (ATHDFS) survey of the HubbleDeep Field South reaches sensitivities of ~10 miceoJyJy at 1.4, 2.5, 5.2 and8.7 GHz, making the ATHDFS one of the deepest surveys ever performed with theAustralia Telescope Compact Array. Here we present the optical identificationsof the ATHDFS radio sources using data from the literature. We find that ~66%of the radio sources have optical counterparts to I = 23.5 mag. Deep HSTimaging of the area identifies a further 12% of radio sources. We present newspectroscopic observations for 98 of the radio sources, and supplement thesespectroscopic redshifts with photometric ones calculated from 5-band opticalimaging. The host galaxy colors and radio-to-optical ratios indicate that lowluminosity (or "radio quiet") AGN make up a significant proportion of thesub-mJy radio population, a result which is in accordance with a number ofother deep radio studies. The radio-to-optical ratios of the bright (S_1.4GHz >1 mJy) sources is consistent with a bimodal distribution.

Radio Observations of the Hubble Deep Field South Region IV: Optical Properties of the Faint Radio Population