Vol 16, No 3

A sample of galaxy pairs identified from the LAMOST spectral survey and the Sloan Digital Sky Survey

Shi-Yin Shen, Maria Argudo-Fernández, Li Chen, Xiao-Yan Chen, Shuai Feng, Jing-Liang Hou, Yong-Hui Hou, Peng Jiang, Yi-Peng Jing, Xu Kong, A-Li Luo, Zhi-Jian Luo, Zheng-Yi Shao, Tinggui Wang, Wen-Ting Wang, Yue-Fei Wang, Hong Wu, Xue-Bing Wu, Hai-Feng Yang, Ming Yang, Fang-Ting Yuan, Hai-Long Yuan, Hao-Tong Zhang, Jian-Nan Zhang, Yong Zhang


Abstract A small fraction (< 10%) of the SDSS main galaxy (MG) sample has not been targeted with spectroscopy due to the effect of fiber collisions. These galaxies have been compiled into the input catalog of the LAMOST ExtraGAlactic Surveys and named the complementary galaxy sample. In this paper, we introduce this project and status of the spectroscopies associated with the complementary galaxies in the first two years of the LAMOST spectral survey (till Sep. of 2014). Moreover, we present a sample of 1102 galaxy pairs identified from the LAMOST complementary galaxies and SDSS MGs, which are defined as two members that have a projected distance smaller than 100 h−170 kpc and a recessional velocity difference smaller than 500 km s−1 . Compared with galaxy pairs that are only selected from SDSS, the LAMOST-SDSS pairs have the advantages of not being biased toward large separations and therefore act as a useful supplement in statistical studies of galaxy interaction and galaxy merging.


Keywords galaxies: interactions — galaxies: groups: general

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