Oral Presentation

Environment around quasar at z~3 revealed with the Subaru HSC and CFHT survey data

Author(s): Yuta Suzuki, Hisakazu Uchiyama, Yoshiki Matsuoka (Ehime University), Jun Toshikawa (University of Bath)

Presenter: Yuta Suzuki (Ehime University)

Quasar UV radiation is expected to prevent star formation in the surrounding halos. In order to fully understand galaxy formation, it is thus important to observationally characterize where/how quasars appear in the large-scale structure of galaxies. We investigate the relationship between the spatial distribution of u-dropout galaxies over 20 deg^2 obtained by combining the HSC-SSP and the CLAUDS imaging data, and the positions of 67 quasars obtained by SDSS spectroscopy. We measure the density of u-dropout galaxies in the vicinity of the quasars and investigate correlations of the galaxy overdensity with the UV luminosity, black hole mass, and proximity zone size of the quasars. As a result, we find that none of the quasars hosting the most massive BHs reside in the most overdense regions and that none of the quasars with the largest proximity zones reside in the most overdense regions. These findings may indicate that the quasar radiation indeed suppresses galaxy formation in their vicinity.