An isolated compact galaxy triplet  

作　　者：Shuai Feng Zheng-Yi Shao Shi-Yin Shen Maria Argudo-Femgandez Hong Wu Man-I Lam Ming Yang Fang-Ting Yuan 

机构地区：[1]Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Chinese Academy ofSciences,Shanghai 200030,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing100012,China [4]Key Lab for Astrophysics,Shanghai 200234,China

出　　处：《Research in Astronomy and Astrophysics》2016年第5期17-24,共8页天文和天体物理学研究（英文版）

基　　金：supported by the 973 Program(Grant No.2014CB845705);“Strategic Priority Research Program The Emergence of Cosmological Structures”of the Chinese Academy of Sciences(Grant No.XDB09030200);the National Natural Science Foundation of China(Nos.11390373,11573050 and 11433003);supported by the Science Foundation of Shanghai(No.16ZR1442100);Funding for the creation and distribution of the SDSS archive has been provided by the Alfred P.Sloan Foundation;the participating institutions,NASA;the National Science Foundation;the US Department of Energy;the Japanese Monbukagakusho;the Max Plank Society;The Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST,now called the Guo Shou Jing Telescope)is a National Major Scientific Project built by the Chinese Academy of Sciences;provided by the National Development and Reform Commission;LAMOST is operated and managed by National Astronomical Observatories,Chinese Academy of Sciences

摘　　要：We report the discovery of an isolated compact galaxy triplet SDSS J084843.45＋164417.3, which is first detected by the LAMOST spectral survey and then confirmed by a spectroscopic observation of the BFOSC mounted on the 2.16 meter telescope located at Xinglong Station, which is administered by National Astronomical Observatories, Chinese Academy of Sciences. It is found that this triplet is an iso- lated and extremely compact system, which has an aligned configuration and very small radial velocity dispersion. The member galaxies have similar colors and show marginal star formation activities. These results support the opinion that the compact triplets are well-evolved systems rather than hierarchically forming structures. This serendipitous discovery reveals the limitations of fiber spectral redshift surveys in studying such a compact system, and demonstrates the necessity of additional observations to complete the current redshift sample.We report the discovery of an isolated compact galaxy triplet SDSS J084843.45＋164417.3, which is first detected by the LAMOST spectral survey and then confirmed by a spectroscopic observation of the BFOSC mounted on the 2.16 meter telescope located at Xinglong Station, which is administered by National Astronomical Observatories, Chinese Academy of Sciences. It is found that this triplet is an iso- lated and extremely compact system, which has an aligned configuration and very small radial velocity dispersion. The member galaxies have similar colors and show marginal star formation activities. These results support the opinion that the compact triplets are well-evolved systems rather than hierarchically forming structures. This serendipitous discovery reveals the limitations of fiber spectral redshift surveys in studying such a compact system, and demonstrates the necessity of additional observations to complete the current redshift sample.

关 键 词：galaxies： group -- galaxies： interaction -- galaxies： star formation -- galaxies： evolution 

分 类 号：P152[天文地球—天文学]