The Abundance of High-Redshift Objects as a Probe of Non-Gaussian Initial Conditions
The Abundance of High-Redshift Objects as a Probe of Non-Gaussian Initial Conditions
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DOI：
10.1086/309412
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发表时间：
2000-01
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影响因子：
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通讯作者：
S. Matarrese;L. Verde;R. Jimenez
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文献类型：
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作者：
S. Matarrese;L. Verde;R. Jimenez
观测到的大量高红移星系和星系团包含了关于初始扰动性质的宝贵信息。我们提出了一种方法来计算分析的数量密度的对象作为一个功能的质量和红移的范围内的物理动机的非高斯模型。在这些模型中，非高斯性可以从零开始拨号，并且假设很小。我们计算的概率密度函数平滑的暗物质密度场，我们扩展的Press-Schechter方法轻度非高斯密度场。大量的高红移天体可能与非高斯参数直接相关，因此与产生高斯行为偏差的物理过程直接相关。即使是0.1阶的偏度参数也意味着预测的z ≥ 1天体丰度会发生巨大变化。下一代太空望远镜（NGST）和X射线卫星（XMM）的观测可以用来精确测量原始密度场中的非高斯性。
The observed abundance of high-redshift galaxies and clusters contains precious information about the properties of the initial perturbations. We present a method to compute analytically the number density of objects as a function of mass and redshift for a range of physically motivated non-Gaussian models. In these models the non-Gaussianity can be dialed from zero and is assumed to be small. We compute the probability density function for the smoothed dark matter density field, and we extend the Press-Schechter approach to mildly non-Gaussian density fields. The abundance of high-redshift objects can be directly related to the non-Gaussianity parameter and thus to the physical processes that generated deviations from the Gaussian behavior. Even a skewness parameter of order 0.1 implies a dramatic change in the predicted abundance of z ≳ 1 objects. Observations from the Next Generation Space Telescope (NGST) and X-ray satellites (XMM) can be used to accurately measure the amount of non-Gaussianity in the primordial density field.