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We present the results of a ground-based, high spatial resolution infrared 18micron imaging study of nearby luminous infrared galaxies (LIRGs), using theSubaru 8.2-m and Gemini South 8.1-m telescopes. The diffraction-limited imagesroutinely achieved with these telescopes in the Q-band (17-23 micron) allow usto investigate the detailed spatial distribution of infrared emission in theseLIRGs. We then investigate whether the emission surface brightnesses aremodest, as observed in starbursts, or are so high that luminous active galacticnuclei (AGNs; high emission surface brightness energy sources) are indicated.The sample consists of 18 luminous buried AGN candidates andstarburst-classified LIRGs identified in earlier infrared spectroscopy. We findthat the infrared 18 micron emission from the buried AGN candidates isgenerally compact, and the estimated emission surface brightnesses are high,sometimes exceeding the maximum value observed in and theoretically predictedfor a starburst phenomenon. The starburst-classified LIRGs usually displayspatially extended 18 micron emission and the estimated emission surfacebrightnesses are modest, within the range sustained by a starburst phenomenon.The general agreement between infrared spectroscopic and imaging energydiagnostic methods suggests that both are useful tools for understanding thehidden energy sources of the dusty LIRG population.

Subaru and Gemini High Spatial Resolution Infrared 18 Micron Imaging Observations of Nearby Luminous Infrared Galaxies