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arXiv 1303.1024astro-ph.CO
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用三维弱透镜探测重子声学振荡

Detecting baryon acoustic oscillations by 3d weak lensing

Alessandra Grassi, Bjoern Malte Schaefer

摘要:

本文研究了用三维弱透镜探测宇宙物质分布中的重子声学振荡特征的可能性。重子振荡是无法访问的,甚至弱透镜层析成像,因为宽线的视线加权函数,并需要一个专门的方法,通过三维剪切估计。我们量化的不确定性估计的物质谱振幅在重子振荡波矢量的费舍尔矩阵的方法与固定的宇宙学,并以这种方式表明,未来的弱透镜调查,如EUCLID和DES能够拿起前四个摆动,EUCLID给出了更好的测量精度。我们还提供了一个详细的调查之间存在的相关性的错误和他们的缩放行为的调查参数,如中值红移,红移误差,错误的星系形状测量,天空覆盖范围,最后相对于摆动的数量之一是试图确定。

英文摘要:

We investigate the possibility of detecting baryon acoustic oscillation features in the cosmic matter distribution by 3d weak lensing. Baryon oscillations are inaccessible even to weak lensing tomography because of wide line-of-sight weighting functions and require a specialized approach via 3d shear estimates. We quantify the uncertainty of estimating the matter spectrum amplitude at the baryon oscillations wave vectors by a Fisher-matrix approach with a fixed cosmology and show in this way that future weak lensing surveys such as EUCLID and DES are able to pick up the first four wiggles, with EUCLID giving a better precision in the measurement. We also provide a detailed investigation of the correlation existing between errors and of their scaling behavior with respect to survey parameters such as median redshift, error on redshift, error on the galaxy shape measurement, sky coverage, and finally with respect to the number of wiggles one is trying to determine.

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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