完整本地卷组示例的第一批结果
First Results from the Complete Local-Volume Groups Sample
摘要：
星系群构成了本星系宇宙中大多数星系的环境，许多星系群拥有一个扩展的热的群内介质，其辐射冷却似乎为群中心星系的活动星系核提供了燃料，并通过反馈稳定下来。不幸的是，由于缺乏本地宇宙中具有代表性的可靠样本，对星系群的物理性质以及活动星系核对其成员星系和气体晕的影响的研究受到了限制。为了解决这个问题，我们已经组装了完整的局部体积组样本（CLoGS），这是一个在80 Mpc范围内的53组光学选择的完整样本，我们的目标是在低频无线电和X射线波段进行观察。我们在这里描述的结果，从样品的前半部分，其中X射线和射电观测是完整的。大约55%的星系团具有星系团尺度的X射线晕，其中约65%的星系团具有与星系团相似的冷核。在26个中央星系群中，有25个拥有射电活动星系核，而在X射线亮星系群中，只有冷核系统被发现支持中央喷流源。
英文摘要：
Galaxy groups form the environment of the majority of galaxies in the local Universe, and many host an extended hot intra-group medium whose radiative cooling appears to fuel, and be stabilised by, feedback from AGN in group-central galaxies. Unfortunately studies of the physical properties of groups and the influence of AGN on their member galaxies and gaseous haloes have been limited by a lack of reliable representative samples of groups in the local Universe. To address this problem, we have assembled the Complete Local-Volume Groups Sample (CLoGS), an optically-selected statistically-complete sample of 53 groups within 80 Mpc, which we aim to observe in both low-frequency radio and X-ray wavebands. We here describe results from the first half of the sample, for which X-ray and radio observations are complete. Roughly 55% of the groups have group-scale X-ray halos, of which ~65% have cool cores a similar fraction to that found in galaxy clusters. While 25 of the 26 group central galaxies host radio AGN, among the X-ray bright groups only the cool core systems are found to support central jet sources.
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