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1 ,

2 1 Credit: NASA/JPL-Caltech/R. Hurt SSC-Caltech ,

3 11 12 V 30 K 2 μm 3 Keck VLT , PtSi PANIC * K IRSF SIRIUS 17 PANIC SIRIUS 3 HAWAII J 1.25 μm H 1.63 μm Ks 2.14 μm 7.7 IRSF/SIRIUS IRSF/SIRIUS , 4 IRSF/SIRIUS PANIC * 2 * 1 PANIC PANIC 16 * 2 20 NEC

4 2 IRSF J 16.4 H 14.5 Ks 13.1 PANIC Ks

5 * PANIC K J H , OGLE Optical Gravitational Lensing Experiment 10 *

6 27 RR 2 OGLE I 0.8 μm 28 J I , RR δ

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8 NGC4038/39 ASTE 29, , , 34 2, , Kiso Wide-Field Camera KWFC CCD

9 KWFC 38 4 IRSF SIRIUS IRSF/SIR- IUS Leavitt H. S., Pickering E. C., 1912, Harvard College Observatory Circ. 173, 1 2 Bono G., et al., 2005, ApJ 621, Fernie J. D., et al., 1995, Inform. Bull. Variable Stars 4148, 1 4 Matsunaga N., et al., 2011, Nature 477, Genzel R., et al., 2010, Rev. Mod. Phys. 82, Gillessen S., et al., 2011, Nature 481, 51 7 Zoccali M., et al., 2003, A&A 399, Serabyn E., Morris M., 1996, Nature 382, Yusef-Zadeh F., et al., 2009, ApJ 702, Figer D.F., et al., 1999, ApJ 525, van Loon J. Th., et al., 2003, MNRAS 338, Gallart C., et al., 2005, ARA&A 43, Schödel R., et al., 2003, Nature 419, Rafelski M., et al., 2007, ApJ 659, Glass I. S., et al., 2001, MNRAS 321, , 89, , 18 Nishiyama S., et al., 2005, ApJ 621, L Nishiyama S., et al., 2006, ApJ 647, , , 103, Harris H. C., 1985, AJ 90, Harris H. C., Wallerstein G., 1984, AJ 89, Fernie J. D., Ehlers P., 1999, AJ 117, Matsunaga N., et al., 2009, MNRAS 399, Gillessen S., et al., 2009, ApJ 692, Soszyński I., et al., 2008, Acta Astronomica 58, Laney C. D., Stobie R. S., 1993, MNRAS 260, Tamura Y., et al., 2009, Nature 459, Hatsukade B., et al., 2011, MNRAS 411, Weinberg M. D., Blitz L., 2006, ApJ 641, L33 32 Purcell C. W., et al., 2011, Nature 477, Binney J., et al., 1991, MNRAS 252, Kim S. S., et al., 2011, ApJ 735, L11 35 Stark A. A., et al., 2004, ApJ 614, L41 36 Baba J., et al., 2010, PASJ 62, Wada K., et al., 2011, ApJ 735, , Star Formation and Evolution of the Galactic Nuclear Bulge Revealed with Cepheid Variable Stars Noriyuki Matsunaga Kiso Observatory, Institute of Astronomy, School of Science, The University of Tokyo, Mitake, Kiso-machi, Kiso-gun, Nagano , Japan Abstract: After the eight year monitoring survey using the IRSF/SIRIUS, we discovered three classical Cepheid variable stars around the Galactic Center. Based on the relation between the pulsation period and age, all of them are 25 Myr old. On the other hand, we found none whose age falls between 30 and 70 Myr old. This indicates the variation in star formation rate around the Galactic Center. We discuss its impact on the evolution of the Galaxy

( ) 2 self-consistent 1 3) ( ) 2.1 ( ) ( 1 kpc 10 8 M 10 4 K) 1024 2 4096 2 100 1680 ( 1) 10 K 10 4 5 K tangled-web model ( ) 2

( ) 2 self-consistent 1 3) ( ) 2.1 ( ) ( 1 kpc 10 8 M 10 4 K) 1024 2 4096 2 100 1680 ( 1) 10 K 10 4 5 K tangled-web model ( ) 2 Numerical Modeling of the Interstellar Medium WADA Keiichi (National Astronomical Observatory of Japan) Abstract The interstellar medium in galaxies has a complicated multi-phase structure. However, in

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