Oral Presentation
Environment of SDSS quasars at z = 0.3-1.0 traced by Subaru HSC
Presenter: Kohei Shibata (Ehime University)
We report our recent statistical study of the local density environment around 1,962 SDSS quasars at 0.3 < z < 1.0, based on HSC Subaru Strategic Program (HSC-SSP) over 1,000 deg^2.
We extract quasars at z=0.3-1.0 from the SDSS DR14 quasar catalog. We also make a sample of comparison galaxies with matched-stellar-mass and matched-redshift. We adopt the k-nearest method using HSC galaxies to define the local galaxy number density environments of the quasars and the comparison galaxies. As a result, we find no significant difference of the environments between them.
We also examine the possible correlations between the local galaxy density and some properties of SDSS quasars such as the i-band absolute magnitude and black hole mass. As a result, we find a weak but significant correlation between local galaxy density and AGN properties (the absolute magnitude and black hole mass). The comparison galaxy sample also shows similar weak correlation between the local galaxy density and the stellar mass. These findings suggest that the correlation between environments around quasars and properties of quasars is caused by the fact that more massive galaxies tend to be located in higher density environments.
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