We investigate the relation between star formation activity and PAH 3.3 μm emission. Our targets are mid-infrared-excess galaxies selected from the AKARI all-sky survey point source catalog. We performed AKARI near-infrared spectroscopy for them. As a result, we obtained 2.5 − 5 μm spectra of 79 galaxies, and selected 35 star-forming galaxies out of them. Comparing the PAH 3.3 μm luminosities with the infrared luminosities, we find a linear correlation between them. However, by adding the results from literatures for luminous infrared galaxies and ultra-luminous infrared galaxies that are more luminous than our sample, the ratio of the PAH to the infrared luminosity is found to decrease towards the luminous end.

ABSTRACT
1. INTRODUCTION
2. OBSERVATION AND DATA ANALYSIS
3. DISCUSSION AND CONCLUSION
REFERENCES

• R. YAMADA(Graduate school of science, Nagoya University)
• S. OYABU(Graduate school of science, Nagoya University)
• H. KANEDA(Graduate school of science, Nagoya University)
• M. YAMAGISHI(Graduate school of science, Nagoya University)
• D. ISHIHARA(Graduate school of science, Nagoya University)
• J. H. KIM(Department of Physics and Astronomy, Seoul National University)
• M. IM(Department of Physics and Astronomy, Seoul National University)
• Y. TOBA(Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency)