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Active galactic nuclei (AGNs) are key for understanding the coevolution ofgalaxies and supermassive black holes (SMBHs). AGN activity is thought toaffect the properties of their host galaxies, via a process called "AGNfeedback", which drives the co-evolution. From a parent sample of 1151 z < 1type-1 quasars from the Sloan Digital Sky Survey quasar catalog, we detectedhost galaxies of 862 of them in the high-quality grizy images of the SubaruHyper Suprime-Cam (HSC) survey. The unprecedented combination of the surveyarea and depth allows us to perform a statistical analysis of the quasar hostgalaxies, with small sample variance. We fit the radial image profile of eachquasar as a linear combination of the point spread function and the Sersicfunction, decomposing the images into the quasar nucleus and the host galaxycomponents. We found that the host galaxies are massive, with stellar massMstar > 10^(10) Msun, and are mainly located on the green valley. This trend isconsistent with a scenario in which star formation of the host galaxies issuppressed by AGN feedback, that is, AGN activity may be responsible for thetransition of these galaxies from the blue cloud to the red sequence. We alsoinvestigated the SMBH mass to stellar mass relation of the z < 1 quasars, andfound a consistent slope with the local relation, while the SMBHs may beslightly undermassive. However, the above results are subject to our sampleselection, which biases against host galaxies with low masses and/or largequasar-to-host flux ratios.

Subaru Hyper Suprime-Cam View of Quasar Host Galaxies at z < 1