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arXiv 0812.1025astro-ph
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发光红星系的Sachs-Wolfe积分信号图

A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies

Benjamin R. Granett, Mark C. Neyrinck, István Szapudi

摘要:

我们构建了一个地图的时间导数的引力位跟踪SDSS发光红星系。由于宇宙加速作用,势能在大尺度上衰减,通过积分萨克斯-沃尔夫(ISW)效应在宇宙微波背景(CMB)辐射上留下印记。通过模板拟合,我们在2-sigma置信水平下直接测量CMB上的此签名。测量结果与互相关统计相一致,加强了暗能量确实是相关性原因的说法。这种新方法可能简化宇宙学解释。我们构建的线性ISW地图显示没有证据表明度尺度的冷和热点与超空和超星系团结构。这表明,在一个和谐的Lambda-CDM宇宙学的线性ISW效应是不够的,以解释这些结构,我们以前报道的强大的CMB印记。

英文摘要:

We construct a map of the time derivative of the gravitational potential traced by SDSS Luminous Red Galaxies. The potential decays on large scales due to cosmic acceleration, leaving an imprint on cosmic microwave background (CMB) radiation through the integrated Sachs-Wolfe (ISW) effect. With a template fit, we directly measure this signature on the CMB at a 2-sigma confidence level. The measurement is consistent with the cross-correlation statistic, strengthening the claim that dark energy is indeed the cause of the correlation. This new approach potentially simplifies the cosmological interpretation. Our constructed linear ISW map shows no evidence for degree-scale cold and hot spots associated with supervoid and supercluster structures. This suggests that the linear ISW effect in a concordance Lambda-CDM cosmology is insufficient to explain the strong CMB imprints from these structures that we previously reported.

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