2dFGRS中的连接结构
Connected structure in the 2dFGRS
摘要：
我们描述和应用一个简单的处方定义连接结构的星系红移调查。该方法是基于两个传递与朋友的朋友groupfinder。第一遍使用圆柱形连接体积来寻找星系群和星系团，以抑制这些深势阱中星系的大随机速度所引入的视线拖尾。第二个过程使用球形链接体积执行，识别连接的组件。该算法已被应用于2dFGRS，在其中它挑选出总共7，603个系统，其中至少包含两个星系，平均红移小于0.12。具有许多成员的连接系统在本质上看起来是连续的，并且该算法在2dFGRS内恢复了两个特别大的细丝。为了比较，该算法也已被应用到LambdaCDM模拟星系调查。虽然这种系统的模型总体与2dFGRS中的模型总体大致相似，但它通常不包含如此巨大的结构。
英文摘要：
We describe and apply a simple prescription for defining connected structures in galaxy redshift surveys. The method is based upon two passes with a friends-of-friends groupfinder. The first pass uses a cylindrical linking volume to find galaxy groups and clusters, in order to suppress the line-of-sight smearing introduced by the large random velocities of galaxies within these deep potential wells. The second pass, performed with a spherical linking volume, identifies the connected components. This algorithm has been applied to the 2dFGRS, within which it picks out a total of 7,603 systems containing at least two galaxies and having a mean redshift less than 0.12. Connected systems with many members appear filamentary in nature, and the algorithm recovers two particularly large filaments within the 2dFGRS. For comparison, the algorithm is has also been applied to LambdaCDM mock galaxy surveys. While the model population of such systems is broadly similar to that in the 2dFGRS, it does not generally contain such extremely large structures.
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