标题： 孤立晕以及群和团内部晕在LCDM模型中的演化 显示英文标题

标题： Evolution of isolated halos and halos inside of groups and clusters in a LCDM model

摘要： 宇宙中大量物质被认为以暗物质（DM）的形式存在。 由于引力不稳定性，DM会分层地坍缩成暗物质晕。 在本研究中，我们使用高分辨率的N体模拟，在COBE归一化的空间平坦LCDM模型（Omega_0=1-Omega_L=0.3；h=0.7）中研究这种暗物质晕的形成和演化。 本研究的新颖之处在于使用新开发的晕查找算法来研究孤立晕和卫星晕（位于更大群体和簇尺寸系统的有效半径内）的演化。 为了使模拟的晕在典型群体和簇的高密度环境中存活，所需的力和质量分辨率很高：分别为~1-3 kpc和\~10^9 M_sun。 我们使用高分辨率自适应细化树（ART）N体代码来跟踪256^3个暗物质粒子的演化，在一个60/h Mpc的盒子中具有32,000的空间分辨率范围。 我们显示这些晕的相关函数相对于暗物质相关函数是反偏差的，并且比孤立的已退耦物体的相关函数更高且更陡峭。 从z=3到z=1，相关函数仅轻微演化。 从模拟中确定的孤立已退耦物体的质量演化与半解析模型的预测良好一致。 然而，如果我们将在晕目录中包括卫星晕，则存在差异。 显示英文摘要

摘要： A significant fraction of mass in the universe is believed to be in the form of dark matter (DM). Due to gravitational instability, the DM collapses hierarchically into DM halos. In this contribution we present a study of the formation and evolution of such DM halos in a COBE-normalized spatially flat LCDM model (Omega_0=1-Omega_L=0.3; h=0.7) using high-resolution N-body simulations. The novelty of this study is use of the newly developed halo-finding algorithms to study the evolution of both isolated and satellite (located inside virial radii of larger group- and cluster-size systems) halos. The force and mass resolution required for a simulated halo to survive in the high-density environments typical of groups and clusters is high: ~1-3 kpc and \~10^9 M_sun, respectively. We use the high-resolution Adaptive Refinement Tree (ART) N-body code to follow the evolution of 256^3 dark matter particles with dynamic range in spatial resolution of 32,000 in a box of 60/h Mpc. We show that the correlation function of these halos is anti-biased with respect to the dark matter correlation function and is high and steeper than the correlation function of the isolated virialized objects. The correlation function evolves only mildly between z=3 and z=1. The mass evolution of isolated virialized objects determined from the simulation is in good agreement with prediction of semi-analytical models. The differences exist, however, if we include satellite halos in the halo catalogs.