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arXiv 1202.3852astro-ph.CO
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SL2S星系尺度引力透镜样品。I. z=0.2-0.9的大质量早型星系的质光排列

The SL2S Galaxy-scale Gravitational Lens Sample. I. The alignment of mass and light in massive early-type galaxies at z=0.2-0.9

Raphael Gavazzi, Tommaso Treu, Philip J. Marshall, Florence Brault, Andrea Ruff

摘要:

我们研究的质量和光的相对对齐在一个样本的16个大规模的早型星系在z=0.2-0.9,作为强引力透镜。该样本是从作为强透镜遗产调查(SL 2S)的一部分的加拿大-法国-夏威夷望远镜遗产调查的一部分获得的深多波段图像中确定的。更高分辨率的后续成像可用于10个系统的子集。我们构建引力透镜模型,并推断总封闭质量,伸长率和质量分布的位置角。通过与观察到的光分布进行比较,我们推断存在大量平均值为$<γ_{\rm ext}>= 0.12 \pm 0.05$的外部剪切,最有可能是由SL 2 S晶状体的环境引起的。在配套文件中,我们结合这些测量与后续凯克光谱研究的恒星和暗物质含量的早期型星系作为宇宙时间的函数的演变。

英文摘要:

We study the relative alignment of mass and light in a sample of 16 massive early-type galaxies at z=0.2-0.9 that act as strong gravitational lenses. The sample was identified from deep multi-band images obtained as part of the Canada France Hawaii Telescope Legacy Survey as part of the Strong Lensing Legacy Survey (SL2S). Higher resolution follow-up imaging is available for a subset of 10 systems. We construct gravitational lens models and infer total enclosed mass, elongation, and position angle of the mass distribution. By comparison with the observed distribution of light we infer that there is a substantial amount of external shear with mean value $<γ_{\rm ext}>= 0.12 \pm 0.05$, arising most likely from the environment of the SL2S lenses. In a companion paper, we combine these measurements with follow-up Keck spectroscopy to study the evolution of the stellar and dark matter content of early-type galaxies as a function of cosmic time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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