用弱透镜测量校准的星系团改进的光学质量示踪剂
Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements
摘要：
我们发展了一个改进的质量示踪星系团的光学观测参数，并校准质量关系使用弱引力透镜测量。我们采用了从斯隆数字巡天（SDSS）maxBCG目录中光学选择的约13，000个星团的样本，光度红移范围为0.1-0.3。我们考虑的光学示踪剂是集群丰富度，集群光度，最亮的集群星系（BCG）的光度，以及这些参数的组合。我们测量堆叠集群周围的弱透镜信号作为各种示踪剂的函数，并使用它来确定具有最少散射量的示踪剂。我们进一步使用弱透镜数据来校准质量归一化。我们发现，大质量星系团的最佳质量估计值是星系团丰富度N_{200}和最亮星系团亮度L_{BCG}的组合：M_{200\barρ} =（1.27 +/- 0.08）（N_{200} /20）^{1.20 +/- 0.09}（L_{BCG} / \bar{L}_{BCG}（N_{200}））^{0.71 +/- 0.14} \times 10^{14} h^{-1} M_sun，其中$\bar{L}_{BCG}(N_{200})$是在给定丰度下观测到的平均BCG光度。这种改进的质量示踪剂将使星系团成为约束宇宙学参数的更有力的工具。
英文摘要：
We develop an improved mass tracer for clusters of galaxies from optically observed parameters, and calibrate the mass relation using weak gravitational lensing measurements. We employ a sample of ~ 13,000 optically-selected clusters from the Sloan Digital Sky Survey (SDSS) maxBCG catalog, with photometric redshifts in the range 0.1-0.3. The optical tracers we consider are cluster richness, cluster luminosity, luminosity of the brightest cluster galaxy (BCG), and combinations of these parameters. We measure the weak lensing signal around stacked clusters as a function of the various tracers, and use it to determine the tracer with the least amount of scatter. We further use the weak lensing data to calibrate the mass normalization. We find that the best mass estimator for massive clusters is a combination of cluster richness, N_{200}, and the luminosity of the brightest cluster galaxy, L_{BCG}: M_{200\barρ} = (1.27 +/- 0.08) (N_{200}/20)^{1.20 +/- 0.09} (L_{BCG}/\bar{L}_{BCG}(N_{200}))^{0.71 +/- 0.14} \times 10^{14} h^{-1} M_sun, where $\bar{L}_{BCG}(N_{200})$ is the observed mean BCG luminosity at a given richness. This improved mass tracer will enable the use of galaxy clusters as a more powerful tool for constraining cosmological parameters.
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