arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.3155astro-ph.CO
收藏

维力化晕的质量-浓度关系及其对宇宙学观测量的影响

The mass-concentration relationship of virialized halos and its impact on cosmological observables

Lindsay King, James Mead

摘要:

在冷暗物质宇宙起源中,尖形模拟的维里化晕的一个一般性质是它们的浓度与质量成反比。这种行为也在观测中得到了证实,尽管这种所谓的质量-浓度关系的确切形式和分散性存在差异。一些对大质量晕的观测研究表明,相对于Lambda CDM的预期,它们在统计上过于集中。在这里,我们调查的影响,各种已公布的质量浓度关系,无论是从模拟和来自观测,将对其他宇宙学观测,特别是考虑到即将到来的调查。我们发现,透镜剪切的积分测量,如从晕峰计数,是非常敏感的质量和浓度之间的关系,在固定的sigma-8,和一些报告的拟合之间的差距是远远大于在sigma-8本身的不确定性的影响。我们还简要地评估了重子物理学对集群规模可观的影响,使用国家的最先进的模拟,得出的结论是,它是不太可能引起的高浓度报告的一些集群。

英文摘要:

A generic property of the cuspy simulated virialized halos in cold dark matter cosmogenies is that their concentration is inversely correlated with their mass. This behavior has also been confirmed in observations, although differences in the exact form and dispersion of this so-called mass-concentration relationship have been reported. Some observational studies of massive halos suggest that they are statistically over-concentrated with respect to the expectations of Lambda-CDM. Here we investigate the impact that various published mass-concentration relationships, both from simulations and derived from observations, would have on other cosmological observables, in particular considering upcoming surveys. We find that an integral measure of lensing shear, such as counts of peaks from halos, is very sensitive to the relationship between mass and concentration at fixed sigma-8, and the disparity between some reported fits is much larger than the impact of uncertainty in sigma-8 itself. We also briefly assess the impact of baryonic physics on cluster scale observables, using state-of-the-art simulations, concluding that it is unlikely to give rise to the high concentrations reported for some clusters.

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。

↑