S19A0015

Previous studies have suggested that there exist gigantic supermassive black holes (SMBHs) with MBH >109 M even at z >sim 6 accreting at the Eddington limit, and those SMBHs grow faster than their host galaxies in terms of the BH-galaxy co-evolution known in the local universe. However, our previous studies of low-luminosity quasars show that those trends are strongly biased towards the most luminous population. In this proposal, we aim to measure the virial black hole mass of 4 z∼6 quasars based on Mgii λ2798 using nuMOIRCS. Three of the targets were originally identified in our quasar search with a HSC wide-field survey. With the mass measurements of 19 quasar samples we defined with a redshift and magnitude cut, we will confirm the variety of the black hole properties with a statistical approach, especially by disentangling the updated quasar luminosity function into the black hole mass function (down to MBH∼108M) and the Eddington ratio distribution. This observation will motivate the studies of initial SMBH growth from seed black holes and quasar lifetime. The host galaxy properties are measured in our ALMA projects, from which we address the general co-evolutionary trend of SMBHs and host galaxies at z>6 with the same samples.


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