Cold dark matter. 1: The Formation of dark halos
Cold dark matter. 1: The Formation of dark halos
复制标题
冷暗物质。
DOI：
10.1086/174922
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
E. Bertschinger
中科院分区：
文献类型：
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作者：
J. Gelb;E. Bertschinger
我们使用临界封闭冷暗物质（CDM）模型的数值模拟，研究数值分辨率对可观测量的影响。我们研究模拟多达256（实验3）粒子使用粒子网格（PM）方法和多达144（实验3）粒子使用自适应粒子粒子网格（P3 M）方法。比较了各种模拟结果的星系晕分布。我们还将分布与观测结果进行了比较，并探索了识别晕的方法，包括一种新的算法，该算法可以在围绕峰值的平滑密度场的闭合轮廓内找到所有粒子。模拟的晕显示更多的子结构比预测的Press-Schechter理论。我们能够排除所有ω = 1 CDM模型的线性振幅σ（子8）大于或约= 0.5，因为模拟产生太多的大规模晕与观测相比。模拟也产生了太多的低质量晕。P3 M模拟的晕分布以其圆周速度为特征，与150 km/s小于或= V（sub circ）小于或= 350 km/s的观测结果相当一致。
We use numerical simulations of critically closed cold dark matter (CDM) models to study the effects of numerical resolution on observable quantities. We study simulations with up to 256(exp 3) particles using the particle-mesh (PM) method and with up to 144(exp 3) particles using the adaptive particle-particle-mesh (P3M) method. Comparisons of galaxy halo distributions are made among the various simulations. We also compare distributions with observations, and we explore methods for identifying halos, including a new algorithm that finds all particles within closed contours of the smoothed density field surrounding a peak. The simulated halos show more substructure than predicted by the Press-Schechter theory. We are able to rule out all omega = 1 CDM models for linear amplitude sigma(sub 8) greater than or approximately = 0.5 because the simulations produce too many massive halos compared with the observations. The simulations also produce too many low-mass halos. The distribution of halos characterized by their circular velocities for the P3M simulations is in reasonable agreement with the observations for 150 km/s less than or = V(sub circ) less than or = 350 km/s.