Can electron distribution functions be derived through the Sunyaev-Zel'dovich effect?
Can electron distribution functions be derived through the Sunyaev-Zel'dovich effect?
复制标题
可以通过 Sunyaev-Zeldovich 效应导出电子分布函数吗？
DOI：
10.1051/0004-6361/201016036
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发表时间：
2011
影响因子：
6.5
通讯作者：
K.-I.
中科院分区：
文献类型：
--
作者：
Prokhorov;D. A.;Colafrancesco;S.;Akahori;T.;Yoshikawa;K.;Nagataki;S.;Seon;K.-I.
测量宇宙微波背景辐射的Sunyaev-Zel'dovich效应畸变，为推导星系团的气体压力和温度提供方法。在这里，我们研究SZ效应观测的能力，以获得电子分布函数（DF）在大规模galaxyclusters.MethodsOur的SZ效应的计算包括相对论修正的框架内考虑的赖特形式主义和使用分解技术的电子DF到傅立叶级数。使用多频测量的SZ效应，我们找到了一个线性方程组的解决方案，用于推导傅立叶系数，我们进一步分析不同的频率样本，以减少不确定性的傅立叶系数estimation.ResultsWe提出了一种方法来推导DF的电子使用SZ多频观测的大规模星系团。我们发现，导出电子DF的最佳频率样本包括高频ν= 375，600，700，857 GHz。我们表明，它是可能的区分Juttner DF从麦克斯韦-Bolzman DF以及从Juttner DF与第二电子布居SZ观测的最佳频率样本，如果SZ强度测量的精度小于0.1%。通过对一个热合并星系团的三维流体动力学数值模拟，我们证明了在频率ν= 375，600，700，857 GHz时SZ强度图的形态是不同的。我们强调，SZ强度在这些频率的测量是一个很有前途的工具，研究星系团中的电子分布函数。
AimsMeasurements of the Sunyaev-Zel’dovich (hereafter SZ) effect distortion of the cosmic microwave background provide methods to derive the gas pressure and temperature of galaxy clusters. Here we study the ability of SZ effect observations to derive the electron distribution function (DF) in massive galaxy clusters.MethodsOur calculations of the SZ effect include relativistic corrections considered within the framework of the Wright formalism and use a decomposition technique of electron DFs into Fourier series. Using multi-frequency measurements of the SZ effect, we find the solution of a linear system of equations that is used to derive the Fourier coefficients; we further analyze different frequency samples to decrease uncertainties in Fourier coefficient estimations.ResultsWe propose a method to derive DFs of electrons using SZ multi-frequency observations of massive galaxy clusters. We found that the best frequency sample to derive an electron DF includes high frequenciesν= 375, 600, 700, 857 GHz. We show that it is possible to distinguish a Juttner DF from a Maxwell-Bolzman DF as well as from a Juttner DF with the second electron population by means of SZ observations for the best frequency sample if the precision of SZ intensity measurements is less than 0.1%. We demonstrate by means of 3D hydrodynamic numerical simulations of a hot merging galaxy cluster that the morphologies of SZ intensity maps are different for frequenciesν= 375, 600, 700, 857 GHz. We stress that measurements of SZ intensities at these frequencies are a promising tool for studying electron distribution functions in galaxy clusters.