论文标题
SDSS DR8 REDMAPPER目录的XMM群集调查分析：散布，选择偏差和群集比例关系中的各向同性的影响
The XMM Cluster Survey analysis of the SDSS DR8 redMaPPer Catalogue: Implications for scatter, selection bias, and isotropy in cluster scaling relations
论文作者
论文摘要
在本文中，我们使用$ XMM $ cluster调查（XCS）的数据产品介绍了SDSS DR8 Redmapper（SDSSRM）群集的X射线分析。总共有1189个SDSSRM簇属于$ XMM $ -Newton的足迹。这产生了456个确认的检测，并带有X射线光度（$ L_ {x} $）测量值。在检测到的簇中，有382个具有关联的X射线温度测量（$ t_ {x} $）。这代表了迄今为止连贯派生的群集$ t_ {x} $值的最大样本之一。 Our analysis of the X-ray observable to richness ($λ$) scaling relations has demonstrated that scatter in the $T_{X}-λ$ relation is roughly a third of that in the $L_{X}-λ$ relation, and that the $L_{X}-λ$ scatter is intrinsic, i.e. will not be significantly reduced with larger sample sizes.我们对$ l_ {x} $和$ t_ {x} $之间的缩放关系的分析表明，拟合对样品的选择方法很敏感，即样品是否是由与$ xmm $ xmm $有意为目标的群集组成的。这些差异也可以在$ l_ {x}-λ$关系中看到，并且在$ t_ {x}-λ$关系中也较小。排除簇核的排放并不对发现产生重大影响。选择偏见的结合可能是造成这些差异的原因，但尚未证实。最后，我们还使用数据来探测$ l_ {x} -t_ {x} $关系中各向异性的最新主张。我们没有发现分发镜的证据，但是强调，通过SDSS DR8样本的不完全偏差覆盖范围，我们的分析可能会掩盖这一点。
In this paper we present the X-ray analysis of SDSS DR8 redMaPPer (SDSSRM) clusters using data products from the $XMM$ Cluster Survey (XCS). In total, 1189 SDSSRM clusters fall within the $XMM$-Newton footprint. This has yielded 456 confirmed detections accompanied by X-ray luminosity ($L_{X}$) measurements. Of the detected clusters, 382 have an associated X-ray temperature measurement ($T_{X}$). This represents one of the largest samples of coherently derived cluster $T_{X}$ values to date. Our analysis of the X-ray observable to richness ($λ$) scaling relations has demonstrated that scatter in the $T_{X}-λ$ relation is roughly a third of that in the $L_{X}-λ$ relation, and that the $L_{X}-λ$ scatter is intrinsic, i.e. will not be significantly reduced with larger sample sizes. Our analysis of the scaling relation between $L_{X}$ and $T_{X}$ has shown that the fits are sensitive to the selection method of the sample, i.e. whether the sample is made up of clusters detected "serendipitously" compared to those deliberately targeted by $XMM$. These differences are also seen in the $L_{X}-λ$ relation and, to a lesser extent, in the $T_{X}-λ$ relation. Exclusion of the emission from the cluster core does not make a significant impact to the findings. A combination of selection biases is a likely, but as yet unproven, reason for these differences. Finally, we have also used our data to probe recent claims of anisotropy in the $L_{X}-T_{X}$ relation across the sky. We find no evidence of anistropy, but stress that this may be masked in our analysis by the incomplete declination coverage of the SDSS DR8 sample.
