We investigate the evolution of initial fractal clusters at 3 kpc from the Galactic Center (GC) of the MilkyWay and show how red supergiant clusters (RSGCs)-like objects, which are considered to be the result of active star formation in the Scutum complex, can form by 16 Myr. We find that initial tidal filling and tidal over-filling fractals are shredded by the tidal force, but some substructures can survive as individual subclusters, especially when the initial virial ratio is ≤0.5. These surviving subclusters are weakly mass segregated and show a top-heavy mass function. This implies the possibility that a single substructured star cluster can evolve into multiple ‘star clusters’.

Introduction
Method
    Tidal Field
    Initial Position and Velocity Structures
    Cluster Mass and IMF
    Initial Fractal Size and Internal Energy
    Identification of Surviving Clusters
    Mass Segregation Ratio, Lg
Results
    Morphology
    Mass Segregation
    Stellar Density Profile
Comparison with Observations
Summary
Acknowledgments
References

• So-Myoung Park(Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea)
• Jihye Shin(Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea) Corresponding author
• Sang-Hyun Chun(Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea)
• Simon P. Goodwin(Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK)
• Kyungwon Chun(Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea)
• Sungsoo S. Kim(Humanitas College, Kyung Hee University, Yongin, Gyeonggi 17104, Republic of Korea)