arXiv 0810.48382008-10astro-ph

论大尺度结构对强引力透镜的贡献

On the contribution of large scale structure to strong gravitational lensing

C. Faure, J. -P. Kneib, S. Hilbert, R. Massey, G. Covone, A. Finoguenov, A. Leauthaud, J. E. Taylor, S. Pires, N. Scoville, A. Koekemoer

备注：: Accepted for publication in ApJ, 16/01/2009. Minor changes, Fig.1 and Fig.5 replaced
发表信息：: Astrophys.J.695:1233-1243,2009
DOI：: 10.1088/0004-637X/695/2/1233

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摘要：

我们研究了星系-星系强透镜候选者的位置与来自弱透镜或X射线辐射的大尺度结构示踪物之间的相关性。COSMOS调查是一个独特的数据集，结合了深度，高分辨率和连续成像，其中发现了强透镜，加上无与伦比的多波长覆盖。为了帮助解释COSMOS数据，我们还根据Millenium模拟的射线追踪制作了模拟COSMOS强透镜和弱透镜观测。在协议的模拟，我们发现，具有最大的角间距的强透镜的图像中发现的密集区域的COSMOS领域。这可以解释为在椭圆星系的稠密环境中透镜群的普遍存在，这些星系具有高的总质量与恒星质量比，可以使光线偏转更大的角度。然而，我们还发现，具有强引力透镜的椭圆星系的总体比例与局部质量密度无关;这种观察结果与模拟结果不符，模拟结果预测在密集环境中强透镜的比例会增加。这种差异可能是一种真实的影响，但也可以用我们分析的各种局限性来解释。例如，我们对强透镜系统的视觉搜索可能是不完整的，并受到选择偏差的影响;椭圆星系的光度函数可能在我们的真实数据和模拟数据之间存在差异;或者我们在透镜模拟中使用的简化假设和近似可能是不够的。因此，工作正在进行中。对强透镜系统的自动搜索在更好地约束选择功能方面将特别重要。

英文摘要：

We study the correlation between the locations of galaxy-galaxy strong lensing candidates and tracers of large-scale structure from both weak lensing or X-ray emission. The COSMOS survey is a unique data set, combining deep, high resolution and contiguous imaging in which strong lenses have been discovered, plus unparalleled multiwavelength coverage. To help interpret the COSMOS data, we have also produced mock COSMOS strong and weak lensing observations, based on ray-tracing through the Millenium simulation. In agreement with the simulations, we find that strongly lensed images with the largest angular separations are found in the densest regions of the COSMOS field. This is explained by a prevalence among the lens population in dense environments of elliptical galaxies with high total-to-stellar mass ratios, which can deflect light through larger angles. However, we also find that the overall fraction of elliptical galaxies with strong gravitational lensing is independent of the local mass density; this observation is not true of the simulations, which predict an increasing fraction of strong lenses in dense environments. The discrepancy may be a real effect, but could also be explained by various limitations of our analysis. For example, our visual search of strong lens systems could be incomplete and suffer from selection bias; the luminosity function of elliptical galaxies may differ between our real and simulated data; or the simplifying assumptions and approximations used in our lensing simulations may be inadequate. Work is therefore ongoing. Automated searches for strong lens systems will be particularly important in better constraining the selection function.

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