An isolated compact galaxy triplet
An isolated compact galaxy triplet
复制标题
孤立的紧凑星系三重态
DOI：
10.1088/1674-4527/16/5/072
复制
发表时间：
2016
影响因子：
1.8
通讯作者：
Yuan Fang-Ting
中科院分区：
文献类型：
--
作者：
Feng Shuai;Shao Zheng-Yi;Shen Shi-Yin;Argudo-Fern;ez Maria;Wu Hong;Lam Man-I;Yang Ming;Yuan Fang-Ting
我们报告了一个孤立的紧凑型星系三重态SDSS J084843.45+164417.3的发现，它首先由LAMOST光谱调查发现，然后由安装在中国科学院国家天文台星龙站2.16米望远镜上的BFOSC光谱观测证实。发现该三重态是一个孤立的、极紧的系统，具有排列的结构和非常小的径向速度色散。成员星系有着相似的颜色，并显示出边缘的恒星形成活动。这些结果支持了致密三胞胎是进化良好的系统而不是分层形成的结构的观点。这一偶然的发现揭示了光纤光谱红移调查在研究这样一个紧凑系统时的局限性，并证明了需要额外的观测来完成当前的红移样本。
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 isolated 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.