弯曲时空中RFGC星系的大尺度集体运动
Large-scale collective motion of RFGC galaxies in curved space-time
摘要：
考虑100 Mpc/h尺度下局部宇宙时空曲率的影响，研究了修正的扁平星系表（RFGC）中扁平边缘螺旋星系的大尺度集体运动。我们分析了集体运动的相对论模型应该如何修改，以提供最佳的参数值，影响这些参数的影响和减轻它们的方法。星系直径的演化，选择效应，以及等照度线和角直径距离之间的差异都不足以解释这种影响。同时，HI线宽和角直径的测量误差可以容易地提供这样的影响。这是一个玩具模型，它允许分析考虑，然后在完整的模型中使用蒙特卡罗模拟。由此产生的速度场非常接近于由非相对论运动模型提供的速度场。得到的整体流速与ΛCDM宇宙学一致。
英文摘要：
We consider large-scale collective motion of flat edge-on spiral galaxies from the Revised Flat Galaxy Catalogue (RFGC) taking into account the curvature of space-time in the Local Universe at the scale 100 Mpc/h. We analyse how the relativistic model of collective motion should be modified to provide the best possible values of parameters, the effects that impact these parameters and ways to mitigate them. Evolution of galactic diameters, selection effects, and difference between isophotal and angular diameter distances are inadequate to explain this impact. At the same time, measurement error in HI line widths and angular diameters can easily provide such an impact. This is illustrated in a toy model, which allows analytical consideration, and then in the full model using Monte Carlo simulations. The resulting velocity field is very close to that provided by the non-relativistic model of motion. The obtained bulk flow velocity is consistent with ΛCDM cosmology.
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