Physics of the Dark Universe ( IF 5.5 ) Pub Date : 2020-12-25 , DOI: 10.1016/j.dark.2020.100765 S. Pradyumna , Sajal Gupta , Sowmya Seeram , Shantanu Desai
We carry out a test of the radial acceleration relation (RAR) for galaxy clusters from two different catalogs compiled in literature, as an independent cross-check of two recent analyses, which reached opposite conclusions. The datasets we considered include a Chandra sample of 12 clusters and the X-COP sample of 12 clusters. For both the samples, we find that the residual scatter is small (0.11-0.14 dex), although the best-fit values for the Chandra sample have large error bars. Therefore, we argue that at least one of these cluster samples (X-COP) obeys the radial acceleration relation. However, since the best-fit parameters are discrepant with each other as well as the previous estimates, we argue that the RAR is not universal. For both the catalogs, the acceleration scale, which we obtain is about an order of magnitude larger than that obtained for galaxies, and is agreement with both the recent estimates.
中文翻译:
星系团的径向加速度关系的另一个测试
我们对文献中汇编的两个不同目录中的星系团的径向加速度关系(RAR)进行了测试,作为对两项最新分析的独立交叉检验,得出了相反的结论。我们考虑的数据集包括12个群集的Chandra样本和12个群集的X-COP样本。对于这两个样本,尽管Chandra样本的最佳拟合值具有较大的误差线,但我们发现其残留散射很小(0.11-0.14 dex)。因此,我们认为这些簇样本(X-COP)中的至少一个服从径向加速度关系。但是,由于最佳拟合参数彼此之间以及先前的估计之间存在差异,因此我们认为RAR不是通用的。对于两个目录,加速度比例,