论文标题
通过其引力潜力来表征星系簇：集群潜力重建的系统学
Characterizing galaxy clusters by their gravitational potential: systematics of cluster potential reconstruction
论文作者
论文摘要
语境。星系簇的质量测量中的偏见是用簇限制宇宙学的主要限制系统。目标。我们的目的是证明与集群重力电位相关的系统学小于静液压质量偏置，因此，在宇宙学研究中，簇电位可能是群集质量的良好替代方法。方法。使用星系簇的宇宙学模拟，我们计算了静液压质量（HE质量）的偏差以及重力潜能中的偏差，这些偏差是根据X射线和毫米波长的测量结果重建的。特别是，我们研究了子结构和非热压力支持对HE质量和重建潜力的影响。结果。我们发现，重建电势的偏差（6％）小于质量的偏差（13％），并且相对于HE质量，重建电位的散射减少了约35％。结论。这项研究表明，通过其重力电势表征星系簇是在群集宇宙学中使用簇质量的有前途的替代方法。
Context. Biases in mass measurements of galaxy clusters are one of the major limiting systematics in constraining cosmology with clusters. Aims. We aim to demonstrate that the systematics associated with cluster gravitational potentials are smaller than the hydrostatic mass bias and that cluster potentials could therefore be a good alternative to cluster masses in cosmological studies. Methods. Using cosmological simulations of galaxy clusters, we compute the biases in the hydrostatic mass (HE mass) and those in the gravitational potential, reconstructed from measurements at X-ray and millimeter wavelengths. In particular, we investigate the effects of the presence of substructures and of non-thermal pressure support on both the HE mass and the reconstructed potential. Results. We find that the bias in the reconstructed potential (6%) is less than that of the HE mass (13%), and that the scatter in the reconstructed potential decreases by about 35% with respect to that in the HE mass. Conclusions. This study shows that characterizing galaxy clusters by their gravitational potential is a promising alternative to using cluster masses in cluster cosmology.
