用系统学有限数据集检验聚类质量指标的可靠性
Testing the Reliability of Cluster Mass Indicators with a Systematics Limited Dataset
摘要：
我们提出的质量X射线可观测的星系团的尺度关系，使用XMM-牛顿星系团目录的斯诺登等人。我们的结果大致与以前的观测和理论工作，有一个主要的例外。我们发现2-3倍的分散周围的最佳拟合质量标度关系，从集群模拟或在其他观测研究中看到的预期。我们认为，这是一个结果，使用流体静力学质量，而不是维里质量，是由于流体静力学质量的温度和气体密度分布的梯度上的明确依赖。我们发现在r_{500}的集群温度分布比以前的观测研究的斜率范围更大。此外，我们发现只有一个弱的气体质量分数对集群质量的依赖关系，与一个常数一致。我们的平均气体质量分数的结果认为，由于仪器校准和分析方法的变化，系统误差的更密切的研究。我们建议，需要更仔细地研究各种观测结果之间的差异，并与集群模拟了解来源的偏差和分散在宇宙学研究的星系团。
英文摘要：
We present the mass-X-ray observable scaling relationships for clusters of galaxies using the XMM-Newton cluster catalog of Snowden et al. Our results are roughly consistent with previous observational and theoretical work, with one major exception. We find 2-3 times the scatter around the best fit mass scaling relationships as expected from cluster simulations or seen in other observational studies. We suggest that this is a consequence of using hydrostatic mass, as opposed to virial mass, and is due to the explicit dependence of the hydrostatic mass on the gradients of the temperature and gas density profiles. We find a larger range of slope in the cluster temperature profiles at r_{500} than previous observational studies. Additionally, we find only a weak dependence of the gas mass fraction on cluster mass, consistent with a constant. Our average gas mass fraction results argue for a closer study of the systematic errors due to instrumental calibration and analysis method variations. We suggest that a more careful study of the differences between various observational results and with cluster simulations is needed to understand sources of bias and scatter in cosmological studies of galaxy 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。
