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We investigate the X-ray active galactic nucleus (AGN) properties ofmillimeter galaxies in the Great Observatories Origins Deep Survey South(GOODS-S) field detected with the Atacama Large Millimeter/submillimeter Array(ALMA), by utilizing the Chandra 7-Ms data, the deepest X-ray survey to date.Our millimeter galaxy sample comes from the ASAGAO survey covering 26arcmin$^2$ (12 sources at a 1.2-mm flux-density limit of $\approx$0.6 mJy),supplemented by the deeper but narrower 1.3-mm survey of a part of the ASAGAOfield by Dunlop et al.\ (2017). Fourteen out of the total 25 millimetergalaxies have Chandra counterparts. The observed AGN fractions at $z=1.5-3$ isfound to be 90$^{+8}_{-19}$\% and $57^{+23}_{-25}$\% for the ultra/luminousinfrared galaxies with $\log L_{\rm IR}/L_{\odot} = 12-12.8$ and $\log L_{\rmIR}/L_{\odot} = 11.5-12$, respectively. The majority ($\sim$2/3) of the ALMAand/or Herschel detected X-ray AGNs at $z=1.5-3$ appear to be star-formationdominant populations, having $L_{\rm X}$/ $L_{\rm IR}$ ratios smaller than the"simultaneous evolution" value expected from the local black-hole mass tostellar mass ($M_{\rm BH}$-$M_*$) relation. On the basis of the $L_{\rm X}$ andstellar mass relation, we infer that a large fraction of star-forming galaxiesat $z=1.5-3$ have black hole masses smaller than those expected from the local$M_{\rm BH}$-$M_*$ relation. This is opposite to previous reports on luminousAGN at same redshifts detected in wider and shallower surveys, which aresubject to selection biases against lower luminosity AGN. Our results areconsistent with an evolutionary scenario that star formation occurs first, andan AGN-dominant phase follows later, in objects finally evolving into galaxieswith classical bulges.

ALMA Twenty-six arcmin$^2$ Survey of GOODS-S at One-millimeter (ASAGAO): X-ray AGN Properties of Millimeter-Selected Galaxies