Oral Presentation
High-z Universe probed via Lensing by QSOs: Studying the SMBH-Galaxy Coevolution using QSO Lenses
Presenter: Yoon Chan Taak (Seoul National University)
The evolution of scaling relations between SMBHs and their host galaxies becomes uncertain at high redshifts (z~1). The HULQ project proposes to use gravitational lensing to measure the masses of QSO host galaxies, an otherwise difficult goal. SMBH masses of QSOs are relatively easy to determine using either reverberation mapping or the single-epoch method. It is possible to estimate the masses of galaxies that act as strong gravitational lenses, if there is a sufficiently bright source behind it along the line of sight. These measurements, if made for a substantial number of QSOs and their hosts at various redshifts, will allow us to study the coevolution of SMBHs and their host galaxies. To determine the feasibility of this study, we present how to estimate the number of sources lensed by QSO hosts, i.e. the number of deflector QSO host galaxies (hereafter QSO lenses).
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