400天星系团巡天弱透镜计划：I：z=0.50时CL0030 +2618的MMT/Megacam分析
The 400d Galaxy Cluster Survey Weak Lensing Programme: I: MMT/Megacam Analysis of CL0030+2618 at z=0.50
摘要：
高红移星系团的质量函数是了解结构形成历史和约束宇宙学参数的一个特别有用的探针。我们的目标是从400天的X射线选择的星系团调查中选出一个高红移，高光度的星系团样本，以获得可靠的质量。在这里，我们将专注于一个特定的对象，CL 0030 +2618在z=0.50使用深度成像在三个通带与MEGACAM仪器在MMT，我们表明，MEGACAM是非常适合测量引力剪切。我们检测到弱透镜信号CL 0030 +2618在5.8西格玛的显着性，使用孔径质量技术。此外，我们发现显着的切向排列的星系到~10弧分或>2r_200的距离从集群中心。CL 0030 +2618的弱透镜中心与几个X射线测量结果和最亮星系团的位置一致。最后，我们推断CL 0030 +2618的弱透镜维里质量为M_200=7.5 × 10^{14} M_sun。尽管在视线中有一个暂定的前景星系群，但CL 0030 +2618的X射线和弱透镜估计是非常一致的。这项研究为迄今为止最大规模的高红移星系团弱透镜调查铺平了道路。
英文摘要：
The mass function of galaxy clusters at high redshifts is a particularly useful probe to learn about the history of structure formation and constrain cosmological parameters. We aim at deriving reliable masses for a high-redshift, high-luminosity sample of clusters of galaxies selected from the 400d survey of X-ray selected clusters. Here, we will focus on a particular object, CL0030+2618 at z=0.50 Using deep imaging in three passbands with the MEGACAM instrument at MMT, we show that MEGACAM is well-suited for measuring gravitational shear. We detect the weak lensing signal of CL0030+2618 at 5.8 sigma significance, using the aperture mass technique. Furthermore, we find significant tangential alignment of galaxies out to ~10 arcmin or >2r_200 distance from the cluster centre. The weak lensing centre of CL0030+2618 agrees with several X-ray measurements and the position of the brightest cluster galaxy. Finally, we infer a weak lensing virial mass of M_200=7.5 10^{14} M_sun for CL0030+2618. Despite complications by a tentative foreground galaxy group in the line of sight, the X-ray and weak lensing estimates for CL0030+2618 are in remarkable agreement. This study paves the way for the largest weak lensing survey of high-redshift galaxy clusters to date.
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