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arXiv 0904.4765astro-ph.CO
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团簇的速度-形状排列和动力学Sunyaev-Zeldovich效应

The velocity--shape alignment of clusters and the kinetic Sunyaev--Zeldovich effect

D. Cunnama, A. Faltenbacher, C. Cress, S. Passmoor

摘要:

我们使用千年模拟探测集群速度和它们的形状和后果的动力学Sunyaev-Zeldovich(KSZ)效应的测量之间的相关性。晕一般是长椭圆体,其方向与附近的晕相关。我们测量的平均流动速度的晕沿分离它们的线,表明特殊的速度和晕的长轴往往有点对齐,特别是对于最大的晕。由于kSZ效应与簇的视线速度和光学深度成比例,因此对准导致沿着视线移动的簇中的kSZ签名的强烈增强。在对kSZ特征的许多分析中没有考虑到这种影响。

英文摘要:

We use the Millennium simulation to probe the correlation between cluster velocities and their shapes and the consequences for measurements of the kinetic Sunyaev-Zeldovich (kSZ) effect. Halos are generally prolate ellipsoids with orientations that are correlated with those of nearby halos. We measure the mean streaming velocities of halos along the lines that separate them, demonstrating that the peculiar velocities and the long axes of halos tend to be somewhat aligned, especially for the most massive halos. Since the kSZ effect is proportional to the line-of-sight velocity and the optical depth of the cluster, the alignment results in a strong enhancement of the kSZ signature in clusters moving along the line of sight. This effect has not been taken into account in many analyses of kSZ signatures.

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