Among the AKARI all-sky survey data, the 9 μm diffuse map is crucial to study the polycyclic aromatic hydrocarbon (PAH) emission features on large spatial scales, while the 18 μm map is useful to trace hot dust emission. To utilize these advantages, we have improved the AKARI mid-infrared (MIR) all-sky survey diffuse maps. For example, we have established special methods to remove the effects of the ionizing radiation in the South Atlantic Anomaly (SAA) and of the scattered light from the moon. Using improved diffuse map data, we study the properties of PAHs and dust in the Galactic center region associated with high-energy phenomena.

ABSTRACT
1. INTRODUCTION
2. NEW ANALYSIS FOR DIFFUSE MAP CONSTRUCTION
    2.1. Correction of Ionizing Radiation Effects
    2.2. Removal of Scattered Light of the Moon
3. PAHs IN THE HARSH ENVIRONMENT
    3.1. Galactic Molecular Loop
    3.2. Bubble in the Galactic Center
4. SUMMARY
REFERENCES

• A. MOURI(Graduate School of Science, Nagoya University)
• H. KANEDA(Graduate School of Science, Nagoya University)
• D. ISHIHARA(Graduate School of Science, Nagoya University)
• S. OYABU(Graduate School of Science, Nagoya University)
• T. KONDO(Graduate School of Science, Nagoya University)
• S. SUZUKI(Graduate School of Science, Nagoya University)
• A. YASUDA(Graduate School of Science, Nagoya University)
• T. ONAKA(Graduate School of Science, University of Tokyo)