标题： 大尺度巡天中Bulk Flow的理论预期 显示英文标题

标题： Theoretical Expectations for Bulk Flows in Large Scale Surveys

摘要： 我们计算了大型尺度巡天的总体运动的理论预期，这种巡天类型最近由Lauer和Postman进行了。包括巡天几何的影响、距离测量误差、样本的聚类特性以及不同假设的功率谱。 我们考虑了从IRAS-QDOT巡天计算出的功率谱，以及来自热 $+$ 冷和标准冷暗物质模型的谱。 我们发现，稀疏采样和聚类可能导致一个比预期大得多的总体流，即使是在一个非常深的巡天中。 我们的结果表明，预期的总体运动与Lauer和Postman报告的结果在 $90-94\%$ 置信水平上不一致。 显示英文摘要

摘要： We calculate the theoretical expectation for the bulk motion of a large scale survey of the type recently carried out by Lauer and Postman. Included are the effects of survey geometry, errors in the distance measurements, clustering properties of the sample, and different assumed power spectra. We consider the power spectrum calculated from the IRAS--QDOT survey, as well as spectra from hot $+$ cold and standard cold dark matter models. We find that sparse sampling and clustering can lead to an unexpectedly large bulk flow, even in a very deep survey. Our results suggest that the expected bulk motion is inconsistent with that reported by Lauer and Postman at the $90-94\%$ confidence level.