(Proposal ID) S15B-136

(PI) Saitoh, Yuriko

(Proposal Title)
Completing secure measurements of SMBH-bulge mass ratio for z ~ 3 quasars

(Abstract)
In order to reveal the whole picture of galaxy and central super-massive black 
hole (BH) formations, it is essential to investigate masses of bulges in 
quasar host galaxies (M_{bulge}) and BHs (M_{BH}) in the early universe in a 
reliable way. Observational investigation of the M_{BH}/M_{bulge} ratio 
(= R_{BH/bulge}) at high-z is strongly required, because different redshift 
evolutions of R_{BH/bulge} are predicted in various models. We propose here 
IRCS+AO188 LGS-mode J-band imaging observation for 2 quasars at z~3.3 to 
complete secure measurement of R_{BH/bulge} ratio at z~3 with less systematic 
errors, leading to constraints on plausible models for the bulge-BH 
coevolution. We have already taken the K'-band images and the spectra of the 
2 quasars and derived K'-band magnitude of host galaxy and M_{BH} via Hbeta 
emission line widths and 5100Angstrom continuum luminosity. Obtained M_{bulge}
 (derived from K'-band data) and M_{BH} suggests no redshift evolution of the 
R_{BH/bulge} with large uncertainty due to lack of J-band data. By using J-band
 data together with K'-band data, we will be able to largely reduce the 
uncertainty and constrain models of R_{BH/bulge} evolution. Stable and small 
PSFs of Subaru telescope with IRCS+AO188 LGS is the greatest advantage over 
rival telescopes.