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Ultra-compact dwarf galaxies: a new component of galaxy clusters and groups

机译：超紧凑的矮星星系：Galaxy集群和群体的新组件

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We recently reported the discovery of a new galaxy type, ultra-compact dwarf (UCD) galaxies, in both the Fornax and Virgo clusters. Here we present new detections of a larger population of UCDs in the Fornax Cluster, as well as the first detections of UCDs in two galaxy groups. We extended our original survey of the Fornax Cluster 1 magnitude fainter, finding a further 46 new compact objects. This means that UCDs outnumber normal galaxies in the central region of the Fornax Cluster. We used this large UCD sample to test the tidal stripping model: simulations indicate that only about half of the UCD population may have formed by disruption of the observed population of nucleated dwarf galaxies. As the UCDs are strongly clustered towards the cluster centre, we conclude that the remaining UCDs must be associated with the much earlier assembly of the central galaxy.
机译：我们最近在Fornax和Virgo集群中报告了新的Galaxy类型，超紧凑型矮人（UCD）星系。在这里，我们在Fornax集群中呈现了更大的UCD种群的新检测，以及两个星系组中的UCDS的第一次检测。我们扩展了对Fornax Cluster 1的原始调查1幅度升高，找到了另外46个新的紧凑型物体。这意味着UCDS Outnumer在Fornax集群的中心区域中的正常星系。我们使用这个大型UCD样本来测试潮汐剥离模型：模拟表明，只有大约一半的UCD人群可能通过破坏观察到的患有患有患有患有的矮化星系。由于UCDS强烈地集中在集群中心，我们得出结论，剩余的UCD必须与中央星系的较早的装配相关联。

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