Study of the equation of state for dark energy and distribution of dark matter by gravitational lensing

利用引力透镜研究暗能量状态方程和暗物质分布

• 批准号: 15540248
• 负责人: FUTAMASE Toshifumi
• 金额: $ 1.98万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540248/
• 关键词: gravitational lens; cold dark matter; Subaru Telescope; Clusters of galaxies; density profile; backreaction on cosmic expansion; 弱い重力レンズ; 暗黒物質; ハッブル宇宙望遠鏡; 構造形成; 残り重力レンズ; ミンコスフキー汎関数; X線観測; gravitational lens; cold dark matter; Subaru Telescope; Clusters of galaxies; density profile; backreaction on cosmic expansion; 弱い重力レンズ; 暗黒物質; ハッブル宇宙望遠鏡; 構造形成; 残り重力レンズ; ミンコスフキー汎関数; X線観測

After the precise determination of the cosmological parameters by the observation of Cosmic Microwave Background Radiation, the understanding structure formation of the universe is one of the unsolved and important problem in cosmology. It is well known that dark matter plays a decisive role in this formation and gravitational lens is the only method to observe directly the dark matter. Thus the observation of gravitational lens is very important. In this point of view we performed the observational studies of various gravitational lens phenomena and obtained the following results.1.We performed weak lens analysis of the date from the observations of a distant cluster of galaxies using the Prime forcus came of Subaru Telescope. The cluster is regarded to be at the forming stage. According to our analysis, the distribution of dark matter is well correlated with the distribution of galaxies. This result support the prediction of Cold Dark Matter (CDM) Structure formation scenario.2.We ha … More ve performed strong lens analysis based on Hubble space telescope (HST) and weak lens analysis based on Subaru telescope for a nearby cluster of galaxies A 1689, and determined a precise mass distribution. This gives us a precise determination of the mass of the cluster and density profile. The global shape of the obtained profile coincides with the prediction of the CDM scenario, but we found that the concentration of the density in the central region is much larger than the prediction. We have proposed more observation of cluster of galaxies to HST and Subaru, and accepted partially.3.We have discovered a new cluster of galaxies by weak lens analysis in the region of a distant cluster of galaxies. This indicates the power of the lens analysis to discover cluster of galaxies.4.We have studied the back reaction of an inhomogeneous distribution of matter on the expansion of the universe and found that the effect behaves like the positive spatial curvature and does not change to the acceleration of the expansion. Less

通过观察宇宙微波背景辐射对宇宙学参数进行了精确确定之后，宇宙的理解结构形成是宇宙学中未解决且重要的问题之一。众所周知，暗物质在这种形成中起着决定性的作用，重力晶状体是直接观察暗物质的唯一方法。重力晶状体的观察非常重要。从这个角度来看，我们进行了各种引力透镜现象的观察性研究，并获得了以下结果。1。我们对使用距离远距离的距离的观察结果进行了对日期的弱晶状体分析。对冷暗物质（CDM）结构形成方案的预测。2。基于哈勃太空望远镜（HST）和基于Subaru望远镜的弱透镜分析，我们进行了更强大的镜头分析，用于1689年的近乎星系，并确定了精确的质量分布。这使我们可以精确地确定簇和密度分布的质量。获得的曲线的全局形状与CDM场景的预测相吻合，但我们发现中央区域中密度的浓度远大于预测。我们已经提出了对HST和Subaru的星系簇的更多观察，并部分接​​受。3。我们通过弱晶状体分析在遥远的星系群的区域中发现了一个新的星系群。4。我们研究了效应的效果不佳和效应的效应，我们研究了物质分布的反应的后背反应，并在效应中效应不断变化。较少的