Abstract. We present our cosmic shear analysis of the Galaxy Evolution from Morphology and SEDs (GEMS) survey. Imaged with the Advanced Camera for Surveys (ACS) on HST, GEMS provides high resolution imaging spanning some 800 square arcmins in the Chandra Deep Field South (CDFS), We discuss the benefits of using space-based data for weak lensing studies and show that the ACS is a very powerful instrument in this regard. We find that we are not limited by systematic errors arising from the anisotropic ACS point spread function distortion and use our cosmic shear results to place joint constraints on the matter density parameter Qm and the amplitude of the matter power spectrum as, finding aai^m/OS)0 62 = 0,73 ± 0 12.
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机译：抽象的。我们展示了对形态和SED（宝石）调查的宇宙剪切分析。与HST的调查（ACS）的高级相机成像，宝石提供了高分辨率的成像，在Chandra Deep Field South（CDFS）中跨越了大约800个平方的arcmins，我们讨论了使用基于空间的数据进行弱镜头研究的好处，并显示在这方面，ACS是一个非常强大的仪器。我们发现，我们不受各向异性ACS点传播函数失真产生的系统错误，并使用宇宙剪切结果在物质密度参数QM上放置关节约束，以及查找AAI ^ M /的物质功率谱的幅度。 OS）0 62 = 0,73±0 12。
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