Department of Astronomy;
Nanjing University;
Nanjing 210093;
Shanghai Astronomical Observatory;
Chinese-Academy of Sciences;
Shanghai 200030;
Joint Institute for Galaxies and Cosmology;
Chinese Academy of Sciences;
Shanghai;
200030;
Joint Astrophysics Center of Chinese Academy of Sciences-Peking University;
Beijing 100871;
The Open Laboratory of Cosmic Ray and High Energy Astrophysics;
Chinese Academy otSciences;
Beijing 100049;