1. Institute of Astrophysics, Central China Normal University , Wuhan 430079, China
2. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, China
3. Department of Astronomy, Beijing Normal University , Beijing 100088, People’s Republic of China
4. Department of Physics, Xiangtan University , Xiangtan, Hunan Province 411105, China
5. College of physics Sciences Technology, Hebei University , No. 180 Wusi Dong Road, Lian Chi District, Baoding City, Hebei Province 071002, China
6. College of Physics and Engineering, Qufu Normal University , Qufu 273165, China
7. Physics and Space Science College, China West Normal University , Nanchong 637002, China
8. College of Physics, Hebei Normal University , 20 South Erhuan Road, Shijiazhuang 050024, Hebei, China
9. University of Chinese Academy of Sciences, Chinese Academy of Sciences , Beijing 100049, China