ANIR (Atacama Near InfraRed camera) is a near infrared camera for the University of Tokyo Atacama 1m telescope, installed at the summit of Co. Chajnantor (5,640 m altitude) in northern Chile. The high altitude and extremely low water vapor (PWV = 0.5 mm) of the site enable us to perform observation of hydrogen Paα emission line at 1.8751 μm . Since its first light observation in June 2009, we have been carrying out a Paα narrow-band imaging survey of nearby luminous infrared galaxies (LIRGs), and have obtained Paα for 38 nearby LIRGs listed in AKARI/FIS-PSC at the velocity of recession between 2,800 km/s and 8,100 km/s. LIRGs are affected by a large amount of dust extinction ( AV~ 3 mag), produced by their active star formation activities. Because Paα is the strongest hydrogen recombination line in the infrared wavelength ranges, it is a good and direct tracer of dust-enshrouded star forming regions, and enables us to probe the star formation activities in LIRGs. We find that LIRGs have two star-forming modes. The origin of the two modes probably come from differences between merging stage and/or star-forming process.

ABSTRACT
1. INTRODUCTION
2. OBSERVATION
    2.1. miniTAO/ANIR
    2.2. Sample Data
3. Paα DISTRIBUTIONS OF LOCAL LIRGs
4. SUMMARY
REFERENCES

• KEN TATEUCHI(Institute of Astronomy, the University of Tokyo)
• KENTARO MOTOHARA(Institute of Astronomy, the University of Tokyo)
• MASAHIRO KONISHI(Institute of Astronomy, the University of Tokyo)
• HIDENORI TAKAHASHI(Institute of Astronomy, the University of Tokyo)
• NATSUKO KATO(Institute of Astronomy, the University of Tokyo)
• YUKA K. UCHIMOTO(Astronomical Institute, Tohoku University)
• KOJI TOSHIKAWA(Institute of Astronomy, the University of Tokyo)
• RYOU OHSAWA(Department of Astronomy, the University of Tokyo)
• YUTARO KITAGAWA(Institute of Astronomy, the University of Tokyo)
• YUZURU YOSHII(Institute of Astronomy, the University of Tokyo)
• MAMORU DOI(Institute of Astronomy, the University of Tokyo)
• KOTARO KOHNO(Institute of Astronomy, the University of Tokyo)
• KIMIAKI KAWARA(Institute of Astronomy, the University of Tokyo)
• MASUO TANAKA(Institute of Astronomy, the University of Tokyo)
• TAKASHI MIYATA(Institute of Astronomy, the University of Tokyo)
• TOSHIHIKO TANABE(Institute of Astronomy, the University of Tokyo)
• TAKEO MINEZAKI(Institute of Astronomy, the University of Tokyo)
• SHIGEYUKI SAKO(Institute of Astronomy, the University of Tokyo)
• TOMOKI MOROKUMA(Institute of Astronomy, the University of Tokyo)
• YOICHI TAMURA(Institute of Astronomy, the University of Tokyo)
• TSUTOMU AOKI(Kiso Observatory, Institute of Astronomy, the University of Tokyo)
• TAKEO SOYANO(Kiso Observatory, Institute of Astronomy, the University of Tokyo)
• KENFICHI TARUSAWA(Kiso Observatory, Institute of Astronomy, the University of Tokyo)
• SHINTARO KOSHIDA(Institute of Astronomy, the University of Tokyo)
• TAKAFUMI KAMIZUKA(Institute of Astronomy, the University of Tokyo)
• TOMOHIKO NAKAMURA(Institute of Astronomy, the University of Tokyo)
• KENTARO ASANO(Institute of Astronomy, the University of Tokyo)
• MIZUHO UCHIYAMA(Institute of Astronomy, the University of Tokyo)
• KAZUSHI OKADA(Institute of Astronomy, the University of Tokyo)
• YOSHIFUSA ITA(Astronomical Institute, Tohoku University)