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The stellar properties of about 800 galaxies hosting optically luminous,unobscured quasars at z < 0.6 are analyzed. Deep co-added Sloan Digital SkySurvey (SDSS) images of the quasars on Stripe 82 are decomposed into nucleusand host galaxy using point spread function and Sersic models. The systematicerrors in the measured galaxy absolute magnitudes and colors are estimated tobe less than 0.5 mag and 0.1 mag, respectively, with simulated quasar images.The effect of quasar light scattered by the interstellar medium is alsocarefully addressed. The measured quasar-to-galaxy ratio in total fluxdecreases toward longer wavelengths, from ~8 in the u band to ~1 in the i and zbands. We find that the SDSS quasars are hosted exclusively by massive galaxies(stellar mass Mstar > 10^{10} Msun), which is consistent with previous resultsfor less luminous narrow-line (obscured) active galactic nuclei (AGNs). Thequasar hosts are very blue and almost absent on the red sequence, showing starkcontrast to the color-magnitude distribution of normal galaxies. The fact thatmore powerful AGNs reside in galaxies with higher star-formation efficiency mayindicate that negative AGN feedback, if it exists, is not concurrent with themost luminous phase of AGNs. We also find positive correlation between the massof supermassive black holes (SMBHs; Mbh) and host stellar mass, but the Mbh -Mstar relation is offset toward large Mbh or small Mstar compared to the localrelation. While this could indicate that SMBHs grow earlier than do their hostgalaxies, such an argument is not conclusive, as the effect may be dominated byobservational biases.

Massive Star-Forming Host Galaxies of Quasars on Sloan Digital Sky Survey Stripe 82