The kinematic Sunyaev—Zel'dovich effect and transverse cluster velocities
The kinematic Sunyaev—Zel'dovich effect and transverse cluster velocities
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运动学 Sunyaev-Zeldovich 效应和横向簇速度
DOI：
10.1046/j.1365-8711.1999.02647.x
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Simmons
中科院分区：
文献类型：
--
作者：
E. Audit;J. Simmons
在运动学 Sunyaev-Zel'dovich 效应中，星系团散射的宇宙微波背景辐射 (CMBR) 的偏振取决于星系团的横向速度。这种偏振效应与横向速度的平方成正比，因此比运动效应中径向运动引起的强度变化弱。 Sunyaev 和 Zeldovich 给出的经常被引用的值将偏振效应低估了 10 倍。此外，我们还表明偏振具有很强的频率依赖性。在高频下，新一代 CMBR 探头应该可以检测到极化。因此，这种效应提供了一种几乎唯一的获得簇矢量速度的方法。
The polarization of the cosmic microwave background radiation (CMBR) scattered by galaxy clusters in the kinematic Sunyaev--Zel'dovich effect depends on the transverse velocity of the cluster. This polarizing effect is proportional to the transverse velocity squared, and so weaker than the change in intensity resulting from the radial motion in the kinematic effect. The value given by Sunyaev and Zeldovich, which is frequently cited, underestimates the polarizing effect by a factor of 10. We show furthermore that the polarization has a strong frequency dependence. At high frequencies the polarization should be detectable with the new generation of CMBR probes. Thus this effect offers, almost uniquely, a method of obtaining the vectorial velocity of clusters.