S20A0141abst

S20A0141

We propose SUBARU IRCS+AO188 high resolution imaging of four luminous quasars at z=2−4 selected from a well defined sample of SDSS quasars with reliable black hole masses above 10**10 Msun based on Halpha or Hbeta. We propose two-band imaging to obtain rest-frame optical luminosities, colors and morphological properties of a quasar sample of the mot massive Black Holes in the universe. All QSOs were well selected with a PSF star close to the QSO and at similar separation from the guide star. The measured colors will be converted into M/L ratios to estimate the stellar masses of the host galaxies. We are particularly interested in discriminating between different co-evolution scenarios for each individual quasar and test whether these extreme quasars need to undergo different formation scenarios to reach their exceptional Black Hole masses. We want to constrain the evolution of the MBH-Mstell relation, setting strong limits on the physics involved in the galaxy-BH co-evolution of the most massive Black Holes.

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