标题： VIMOS-IFU星系团巡天z ~ 0.2大质量星系团。 I. 强引力透镜星系团Abell 2667的观测 显示英文标题

标题： VIMOS-IFU survey of z~0.2 massive galaxy clusters. I. Observations of the strong lensing cluster Abell 2667

摘要： （摘录）我们展示了对X射线亮度高的星团Abell 2667（红移z=0.233）的广泛多色成像和低分辨率VIMOS积分场单元光谱观测。 一个极其明亮的巨大引力弧（红移z=1.0334）很容易被识别为三重图像系统的一部分，而其他较暗的多重图像也被HST-WFPC2图像揭示。 VIMOS-IFU观测覆盖了一个54'' x 54''的视场，并使我们能够确定所有星等到V=22.5的星系的红移。 此外，对于一些星等达到V=23.2的源，也可以识别出红移。 特别是我们在星团内部区域识别出了21个成员星系，从中我们得出了一个速度弥散度为\sigma=960 km /s，相当于在110 kpc半径内总质量为7.1 x 10^{13}个太阳质量。 利用多重图像约束条件以及关于星团星系晕质量分布的先验知识，我们构建了一个详细的透镜质量模型，该模型表明在爱因斯坦半径（16角秒）内的总质量为2.9 x 10^{13}个太阳质量。 虽然透镜质量和动力学质量一致，但后者准确性较低。 然而，将这些测量结果与已发表的X射线分析进行比较则不太明确。 尽管X射线温度与动力学和透镜估计值匹配，但根据X射线测量得出的小浓度c~3的NFW质量模型无法解释在此星团中观察到的大爱因斯坦半径。 然而，大约6的较大浓度会与强透镜测量结果一致。 这些结果可能反映了星团质量分布的复杂结构，强调了从小到大尺度进行全面波段研究的重要性，以便更好地理解星团物理。 显示英文摘要

摘要： (abridged) We present extensive multi-color imaging and low resolution VIMOS Integral Field Unit spectroscopic observations of the X-ray luminous cluster Abell 2667 (z=0.233). An extremely bright giant gravitational arc (z=1.0334) is easily identified as part of a triple image system and other fainter multiple images are also revealed by the HST-WFPC2 images. The VIMOS-IFU observations cover a field of view of 54'' x 54'' and enable us to determine the redshift of all galaxies down to V=22.5. Furthermore, redshifts could be identified for some sources down to V=23.2. In particular we identify 21 cluster members in the cluster inner region, from which we derive a velocity dispersion of \sigma=960 km/s, corresponding to a total mass of 7.1 x 10^{13} solar masses within a 110 kpc radius. Using the multiple images constraints and priors on the mass distribution of cluster galaxy halos we construct a detailed lensing mass model leading to a total mass of 2.9 x 10^{13} solar masses within the Einstein radius (16 arcsec). The lensing mass and dynamical mass are in good agreement although the dynamical one is much less accurate. Comparing these measurements with published X-ray analysis, is however less conclusive. Although the X-ray temperature matches the dynamical and lensing estimates, the published NFW mass model derived from the X-ray measurement with its small concentration of c ~3 can not account for the large Einstein radius observed in this cluster. A larger concentration of ~6 would however match the strong lensing measurements. These results are likely reflecting the complex structure of the cluster mass distribution, underlying the importance of panchromatic studies from small to large scale in order to better understand cluster physics.