tokens: The authors thank the anonymous referee for his/her constructive comments that greatly helped to improve the content of this manuscript. This work is financially supported by National Natural Science Foundation of China (grants no. 11273068, 11473073, 11403105), the Strategic Priority Research Program-The Emergence of Cosmological Structures of the Chinese Academy of Sciences (grant no. XDB09000000), the innovative and interdisciplinary program by CAS (grant no. KJZD-EW-Z001), the Natural Science Foundation of Jiangsu Province (grant no. BK20141509) and the Foundation of Minor Planets of Purple Mountain Observatory.
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