DPOSS II遥远致密群巡天：EMMI-NTT光谱样品
The DPOSS II distant compact group survey: the EMMI-NTT spectroscopic sample
摘要：
本文介绍了DPOSS II星表中138个候选紧致群的红移测量结果（Iovino等人，2003; de Carvalho et al. 2005），它将光谱证实的致密星系群的可用红移范围扩展到z~0.2。巡天的目的是通过光谱红移信息确认星系群成员，测量确认星系群的特征参数，即质量、半径、光度、速度色散和穿越时间，并将它们与附近致密星系群的特征参数进行比较。利用文献中的可用信息，我们还研究了周围的群体环境，并搜索了额外的，以前未知的，群体成员，或更大规模的结构，该群体可能与之相关。在观测到的138个星系群中，有96个星系群有三个或更多的和谐星系，即70%的成功率。在这96个中，有62个在天空中孤立，而其他34个在天空中接近更大规模的结构。剩下的物体被证明是几对或星系在天空中的偶然投影。对群体环境和特征参数（质量、穿越时间、速度弥散）进行了评价和讨论。
英文摘要：
This paper presents the results of the redshift survey of 138 candidate compact groups from the DPOSS II catalog (Iovino et al., 2003; de Carvalho et al. 2005), which extends the available redshift range of spectroscopically confirmed compact groups of galaxies to z~0.2. The aims of the survey are to confirm group membership via spectroscopic redshift information, to measure the characteristic parameters of the confirmed groups, namely mass, radius, luminosity, velocity dispersion and crossing time, and to compare them with those of nearby compact groups. Using available information from the literature, we also studied the surrounding group environment and searched for additional, previously unknown, group members, or larger scale structures to whom the group might be associated. Of the 138 observed groups, 96 had three or more concordant galaxies, i.e. a 70% success rate. Of these 96, 62 are isolated on the sky, while the other 34 are close on the sky to a larger scale structure. The remaining objects turned out to be couple of pairs or chance projection of galaxies on the sky. Group environment and the characteristics parameters (mass, crossing time, velocity dispersion) are evaluated and discussed.
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