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An analytic halo approach to the bispectrum of galaxies in redshift space

机译:红移中星系双谱的解析晕方法   空间

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摘要

We present an analytic formula for the galaxy bispectrum in redshift space onthe basis of the halo approach description with the halo occupationdistribution of central galaxies and satellite galaxies. This work is anextension of a previous work on the galaxy power spectrum, which illuminatedthe significant contribution of satellite galaxies to the higher multipolespectrum through the non-linear redshift space distortions of their randommotions. Behaviors of the multipoles of the bispectrum are compared withresults of numerical simulations assuming a halo occupation distribution of theLOWZ sample of the SDSS-III BOSS survey. Also presented are analyticapproximate formulas for the multipoles of the bispectrum, which is useful tounderstanding their characteristic properties. We demonstrate that the Fingersof God effect is quite important for the higher multipoles of the bispectrum inredshift space, depending on the halo occupation distribution parameters.
机译:我们基于中心方法与中心星系和卫星星系的晕职业分布的晕法描述,提出了红移空间中双星系的一个解析公式。这项工作是先前关于银河系功率谱的工作的扩展,它阐明了卫星星系通过其随机运动的非线性红移空间畸变对更高的多极谱的重大贡献。假设SDSS-III BOSS测量的LOWZ样本的光晕占用分布,将双谱多极的行为与数值模拟的结果进行了比较。还提出了双谱多极的解析近似公式,有助于理解它们的特性。我们证明,取决于光环职业分布参数,上帝的手指效应对于双谱不移空间的较高多极非常重要。

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