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首页> 外文期刊>The Astrophysical journal >PECULIAR VELOCITY LIMITS FROM MEASUREMENTS OF THE SPECTRUM OF THE SUNYAEV-ZELDOVICH EFFECT IN SIX CLUSTERS OF GALAXIES
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PECULIAR VELOCITY LIMITS FROM MEASUREMENTS OF THE SPECTRUM OF THE SUNYAEV-ZELDOVICH EFFECT IN SIX CLUSTERS OF GALAXIES

机译：测量六种星系中的苏涅耶夫-泽尔达维奇效应的光谱所产生的特殊速度极限

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摘要

We have made measurements of the Sunyaev-Zeldovich (SZ) effect in six galaxy clusters at z > 0.2 using the Sunyaev-Zeldovich Infrared Experiment (SuZIE II) in three frequency bands between 150 and 350 GHz. Simultaneous multifrequency measurements have been used to distinguish between thermal and kinematic components of the SZ effect and to significantly reduce the effects of variations in atmospheric emission that can otherwise dominate the noise. We have set limits to the peculiar velocities of each cluster with respect to the Hubble flow and have used the cluster sample to set a 95% confidence limit of less than 1420 km s~(-1) to the bulk flow of the intermediate-redshift universe in the direction of the cosmic microwave background dipole. This is the first time that SZ measurements have been used to constrain bulk flows. We show that systematic uncertainties in peculiar velocity determinations from the SZ effect are likely to be dominated by sub-millimeter point sources, and we discuss the level of this contamination.
机译：我们使用Sunyaev-Zeldovich红外实验（SuZIE II）在150至350 GHz之间的三个频带中，对z> 0.2的六个星系团中的Sunyaev-Zeldovich（SZ）效应进行了测量。同步多频测量已用于区分SZ效应的热和运动成分，并显着降低了大气辐射变化的影响，否则这些变化会主导噪声。我们针对哈勃流设置了每个星团的特殊速度极限，并使用星团样本为中红移的总体流量设置了小于1420 km s〜（-1）的95％置信极限。宇宙在宇宙微波背景偶极子的方向。这是首次使用SZ测量来约束大流量。我们表明，由SZ效应确定的特殊速度确定中的系统不确定性可能由亚毫米级点源控制，并且我们讨论了这种污染的程度。

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