在斯隆数字巡天数据发布10中解剖星系三胞胎：I。恒星星族和发射线分析
Dissecting galaxy triplets in the Sloan Digital Sky Survey Data Release 10: I. Stellar populations and emission line analysis
摘要：
我们从斯隆数字巡天数据发布10中识别出体积有限的样本中的孤立星系三胞胎。我们最后的样本有80个星系系统的红移范围为0.04 $\le$ z $\le$ 0.1，比$M_r = -20.5 + 5\log h_{70}$亮。光谱合成结果和WHAN和BPT诊断图被用来将这些系统中的星系分类为恒星形成，活动核，或被动/退休。我们的研究结果表明，最明亮的星系驱动的三重态演化，证明了作为质量组装和平均恒星星族年龄与三重态属性之间的强相关性。具有中等亮度或三重态中最暗的Galerkin似乎起次要作用。此外，星系的年龄和恒星质量之间的关系对于这些星系是相似的，但对于系统中最亮的星系是不同的。根据WHAN分类，大多数三重星系都是被动或退休的。低质量的三胞胎呈现不同的分数的WHAN类相比，更高的质量三胞胎。对WHAN类组合的普查显示，在低质量三胞胎中恒星形成星系占主导地位，而退休和被动星系在高质量系统中占主导地位。我们认为，这些结果表明，当地的环境，通过最亮的星系驱动的星系相互作用，在三重态演化中发挥着重要作用。
英文摘要：
We identify isolated galaxy triplets in a volume-limited sample from the Sloan Digital Sky Survey Data Release 10. Our final sample has 80 galaxy systems in the redshift range 0.04$\le$z$\le$0.1, brighter than $M_r = -20.5 + 5\log h_{70}$. Spectral synthesis results and WHAN and BPT diagnostic diagrams were employed to classify the galaxies in these systems as star-forming, active nuclei, or passive/retired. Our results suggest that the brightest galaxies drive the triplet evolution, as evidenced by the strong correlations between properties as mass assembly and mean stellar population age with triplet properties. Galaxies with intermediate luminosity or the faintest one within the triplet seem to play a secondary role. Moreover, the relation between age and stellar mass of galaxies is similar for these galaxies but different for the brightest galaxy in the system. Most of the triplet galaxies are passive or retired, according to the WHAN classification. Low mass triplets present different fractions of WHAN classes when compared to higher mass triplets. A census of WHAN class combinations shows the dominance of star-forming galaxies in low mass triplets while retired and passive galaxies prevail in high-mass systems. We argue that these results suggest that the local environment, through galaxy interactions driven by the brightest galaxy, is playing a major role in triplet evolution.
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