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arXiv 0705.3042astro-ph
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从透镜红移测试中得到的宇宙学和星系演化的约束有多强?

How robust are the constraints on cosmology and galaxy evolution from the lens-redshift test?

Pedro R. Capelo, Priyamvada Natarajan

摘要:

已知引力透镜系统中星系透镜的红移分布提供了一个强有力的测试,可以潜在地区分宇宙学模型。然而,这个优雅的测试的应用受到两个因素的限制:我们对星系如何随红移演化的无知,以及缺乏处理透镜系统中不完整信息影响的方法。在本文中,我们详细调查这两个问题。我们探索如何提取演化星系的属性,假设宇宙学是由其他技术很好地确定。我们提出了一种新的嵌套蒙特卡罗方法来量化不完整数据的影响。我们应用透镜红移测试的改进样本的70透镜系统来自最近的观测,主要是从SDSS,SLACS和CLASS调查。我们发现,在应用透镜红移测试的限制因素来自不良的统计,包括不完全的信息样本,和有偏的抽样。将需要许多透镜均匀地采样潜在的真实图像分离分布,以使用该测试作为测量宇宙学常数值或演化星系属性的补充方法。计划未来的调查任务,如SNAP卫星或LSST可能会迎来一个新时代的强透镜研究,利用这种测试。随着数以千计的新的强透镜的预期目录,透镜红移测试可以提供一个强大的工具,以探测宇宙学以及星系演化。

英文摘要:

The redshift distribution of galaxy lenses in known gravitational lens systems provides a powerful test that can potentially discriminate amongst cosmological models. However, applications of this elegant test have been curtailed by two factors: our ignorance of how galaxies evolve with redshift, and the absence of methods to deal with the effect of incomplete information in lensing systems. In this paper, we investigate both issues in detail. We explore how to extract the properties of evolving galaxies, assuming that the cosmology is well determined by other techniques. We propose a new nested Monte Carlo method to quantify the effects of incomplete data. We apply the lens-redshift test to an improved sample of seventy lens systems derived from recent observations, primarily from the SDSS, SLACS and the CLASS surveys. We find that the limiting factor in applying the lens-redshift test derives from poor statistics, including incomplete information samples, and biased sampling. Many lenses that uniformly sample the underlying true image separation distribution will be needed to use this test as a complementary method to measure the value of the cosmological constant or the properties of evolving galaxies. Planned future surveys by missions like the SNAP satellite or LSST are likely to usher in a new era for strong lensing studies that utilize this test. With expected catalogues of thousands of new strong lenses, the lens-redshift test could offer a powerful tool to probe cosmology as well as galaxy evolution.

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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