Wide-field JHKs images obtained with the SIRIUS near-infrared camera of the IRSF 1.4m telescope are used to examine the tidal structures of the spatial stellar configuration around six metal-poor ([Fe/H]< −1.0) globular clusters located within 3 kpc from the Galactic center. The radial surface density profiles are obtained from the surface photometry of the cluster images and the star counting for the photometric data. For the star counting, candidates of cluster member stars are selected with an filtering algorithm in color-magnitude diagrams. We find that the six target clusters show tidal overdensity features in the radial surface density profiles. There is a break inside the tidal radius for each cluster, and the profile in the outer overdensity region is characterized by a power law. Two- dimensional density maps of all the clusters show distorted asymmetric stellar configurations in the outer region. In five out of the six target clusters, the overdensity features are likely to be associated with the effects of the Galaxy dynamical interaction and the cluster space motions. The observed tidal configurations of stars suggest that several metal-poor clusters in the Galactic bulge are possibly surviving remnants of mergers to build the old stellar system of the Galactic bulge.

ABSTRACT
1. INTRODUCTION
2. OBSERVATIONS AND DATA REDUCTION
3. MEMBER STAR SELECTION
4. SPATIAL DISTRIBUTION OF STARS
    4.1 NGC 6266 (M62)
    4.2 NGC 6287
    4.3 NGC 6333 (M9)
    4.4 NGC 6642
    4.5 NGC 6681 (M70)
    4.6 NGC 6723
5. DISCUSSION
6. CONCLUSION
REFERENCES

• CHO-RHONG CHANG(Department of Astronomy, Yonsei University)
• JAE-WOO KIM(Center for the Exploration of the Origin of the Universe (CEOU), Department of Physics and Astronomy, Seoul National University)
• NORIYUKI MATSUNAGA(Kiso Observatory, Institute of Astronomy, the University of Tokyo)
• MIHWA HAN(Department of Astronomy, Yonsei University)
• JONGWAN KO(Korea Astronomy and Space Science Institute)
• SANG-HYUN CHUN(Yonsei University Observatory) Corresponding Author
• MINHEE KANG(Department of Astronomy, Yonsei University)
• YOUNG-JONG SOHN(Department of Astronomy, Yonsei University)