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We present the results of infrared L-band (3-4 micron) slit spectroscopy of30 PG QSOs at z < 0.17, the representative sample of local high-luminosity,optically selected AGNs. The 3.3 micron polycyclic aromatic hydrocarbon (PAH)emission feature is used to probe nuclear (< a few kpc) starburst activity andto investigate the connections between AGNs and nuclear starbursts in PG QSOs.The 3.3 micron PAH emission is detected in the individual spectra of 5/30 ofthe observed PG QSOs. We construct a composite spectrum of PAH-undetected PGQSOs and discern the presence of the 3.3 micron PAH emission therein. Weestimate the nuclear-starburst and AGN luminosities from the observed 3.3micron PAH emission and 3.35 micron continuum luminosities, respectively, andfind that the nuclear-starburst-to-AGN luminosity ratios in PG QSOs are similarto those of previously studied AGN populations with lower luminosities,suggesting that AGN-nuclear starburst connections are valid over the wideluminosity range of AGNs in the local universe. The observednuclear-starburst-to-AGN luminosity ratios in PG QSOs with availablesupermassive black hole masses are comparable to a theoretical prediction basedon the assumption that the growth of a supermassive black hole is controlled bystarburst-induced turbulence.

Infrared 3-4 Micron Spectroscopy of Nearby PG QSOs and AGN-Nuclear Starburst Connections in High-luminosity AGN Populations