标题： XMMU J100750.5+125818：红移为1.082的强引力透镜星系团 显示英文标题

标题： XMMU J100750.5+125818: A strong lensing cluster at z=1.082

摘要： 我们报告基于19个光谱成员的发现，在红移1.082处的X射线明亮星系团XMMU J100750.5+125818，该星系团显示出多个强烈的引力透镜特征。利用VLT和LBT的多色成像对透镜弧特征进行SED建模，揭示了最显著的透镜背景星系的可能红移约为2.7。通过星系团成员的速度弥散率在不同半径上得出质量估计，M_200 ~ 1.8 10^{14} Msun，从X射线光谱参数得出，M_500 ~ 1.0 10^{14} Msun，以及最大的引力透镜弧，M_SL ~ 2.3 10^{13} Msun。星系团星系的投影空间分布似乎呈拉长状，最亮星系相对于X射线辐射偏离中心，表明结构尚未达到平衡。XMMU J100750.5+125818结合强弱引力透镜、光学和X射线光谱学，为遥远星系团的内部质量分布提供了出色的诊断工具。 显示英文摘要

摘要： We report on the discovery of the X-ray luminous cluster XMMU J100750.5+125818 at redshift 1.082 based on 19 spectroscopic members, which displays several strong lensing features. SED modeling of the lensed arc features from multicolor imaging with the VLT and the LBT reveals likely redshifts ~2.7 for the most prominent of the lensed background galaxies. Mass estimates are derived for different radii from the velocity dispersion of the cluster members, M_200 ~ 1.8 10^{14} Msun, from the X-ray spectral parameters, M_500 ~ 1.0 10^{14} Msun, and the largest lensing arc, M_SL ~ 2.3 10^{13} Msun. The projected spatial distribution of cluster galaxies appears to be elongated, and the brightest galaxy lies off center with respect to the X-ray emission indicating a not yet relaxed structure. XMMU J100750.5+125818 offers excellent diagnostics of the inner mass distribution of a distant cluster with a combination of strong and weak lensing, optical and X-ray spectroscopy.