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tokens: Acknowledgements One of the authors (KH) is indebted to Dr. T. Y. Saito for valuable discussion on the CTA sensitivity. This work is supported by the Theoretical Institute for Advanced Research in Astrophysics (TIARA) operated under Academia Sinica, and by the Ministry of Science and Technology of the Republic of China (Taiwan) through grants 103-2628-M-007-003-MY3, 105-2112-M-007-033-MY2, 105-2112-M-007-002, 103-2112-M-001-032-MY3.