2 MASS偶极子收敛吗？
Is the 2MASS dipole convergent?
摘要：
本文研究了2微米全天巡天（2 MASS）星系团偶极的增长。我们发现偶极子在2 MASS扩展源表的完备性极限之前不收敛，即达到约300 Mpc/h。我们比较观察到的增长的偶极子与理论上预期的，有条件的增长的LambdaCDM功率谱和宇宙学参数的约束WMAP。观察到的增长原来是在1西格玛的置信水平的理论之一，一旦适当的观测窗口的2 MASS通量偶极子。作为对比，如果采用的窗口是顶帽，那么预测的偶极子增长明显更快，并在约200 Mpc/h的距离处收敛到其最终值。我们研究的顶帽窗口和窗口的通量限制2 MASS调查之间的差异，我们得出结论，在有效距离大于200 Mpc/h的2 MASS偶极子的增长是显而易见的。最后，由于对于2 MASS的窗口函数，预测的增长与观察到的增长一致，我们可以比较两者以评估beta =（Omega_m）^0.55 / b。结果是beta = 0.38+-0.05，这给出了Omega_m = 0.2+-0.1的粗略估计。
英文摘要：
We study the growth of the clustering dipole of galaxies from the Two Micron All Sky Survey (2MASS). We find that the dipole does not converge before the completeness limit of the 2MASS Extended Source Catalog, i.e. up to about 300 Mpc/h. We compare the observed growth of the dipole with the theoretically expected, conditional growth for the LambdaCDM power spectrum and cosmological parameters constrained by WMAP. The observed growth turns out to be within 1-sigma confidence level of the theoretical one, once the proper observational window of the 2MASS flux dipole is included. For a contrast, if the adopted window is a top hat, then the predicted dipole grows significantly faster and converges to its final value at a distance of about 200 Mpc/h. We study the difference between the top-hat window and the window for the flux-limited 2MASS survey and we conclude that the growth of the 2MASS dipole at effective distances greater than 200 Mpc/h is only apparent. Eventually, since for the window function of 2MASS the predicted growth is consistent with the observed one, we can compare the two to evaluate beta = (Omega_m)^0.55 / b. The result is beta = 0.38+-0.05, which gives a rough estimate of Omega_m = 0.2+-0.1.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
