Angular momentum evolution in dark matter haloes: a study of the Bolshoi and Millennium simulations
Angular momentum evolution in dark matter haloes: a study of the Bolshoi and Millennium simulations
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暗物质晕中的角动量演化：莫斯科大剧院和千年模拟的研究
DOI：
10.1093/mnras/stx2410
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发表时间：
2017
影响因子：
4.8
通讯作者：
Contreras S
中科院分区：
文献类型：
--
作者：
Contreras S
我们使用三种不同的宇宙学暗物质模拟来研究暗物质晕中角动量（AM）矢量的方向如何随时间演变。我们发现这种模拟中的光晕不断受到质量的虚假变化的影响，这会转化为 AM 方向的人为变化。去除受人工质量变化影响的光晕后，我们发现AM矢量方向的变化与时间相关。影响AM矢量的角度和方向的变化（即AM矢量在两个连续时间步长中所对的角度）取决于影响光晕的质量变化、质量发生变化所经过的时间以及光晕质量。我们创建了一个蒙特卡罗模拟来重现 AM 矢量的角度和方向的变化。我们再现了从 8.5 Gyr 的回溯时间到今天 (α) 的 AM 矢量的角距，cos(α) 的精度约为 0.05。我们将随本出版物一起发布蒙特卡罗模拟。我们还创建了一个蒙特卡罗模拟来重现 AM 模量的变化。我们发现，在较密集的环境中，光晕在 AM 方向上表现出最剧烈的演化，并且光晕的特定 AM 模量也较低。这些关系可用于改进我们在低分辨率模拟中跟踪 AM 矢量的方式。
We use three different cosmological dark matter simulations to study how the orientation of the angular momentum (AM) vector in dark matter haloes evolve with time. We find that haloes in this kind of simulations are constantly affected by a spurious change of mass, which translates into an artificial change in the orientation of the AM. After removing the haloes affected by artificial mass change, we found that the change in the orientation of the AM vector is correlated with time. The change in its angle and direction (i.e. the angle subtended by the AM vector in two consecutive time-steps) that affect the AM vector has a dependence on the change of mass that affects a halo, the time elapsed in which the change of mass occurs and the halo mass. We create a Monte Carlo simulation that reproduces the change of angle and direction of the AM vector. We reproduce the angular separation of the AM vector since a lookback time of 8.5 Gyr to today (α) with an accuracy of approximately 0.05 in cos(α). We are releasing this Monte Carlo simulation together with this publication. We also create a Monte Carlo simulation that reproduces the change of the AM modulus. We find that haloes in denser environments display the most dramatic evolution in their AM direction, as well as haloes with a lower specific AM modulus. These relations could be used to improve the way we follow the AM vector in low-resolution simulations.
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DOI：
10.1111/j.1365-2966.2012.21553.x
发表时间：
2012-01
影响因子：
4.8
作者：
Y. Hoffman;Ofer Metuki;G. Yepes;S. Gottlober;J. Forero-Romero;N. Libeskind;A. Knebe
通讯作者：
Y. Hoffman;Ofer Metuki;G. Yepes;S. Gottlober;J. Forero-Romero;N. Libeskind;A. Knebe
影响因子：
4.8
作者：
N. Padilla;Salvador Salazar-Albornoz;S. Contreras;S. Cora;A. Ruiz
通讯作者：
N. Padilla;Salvador Salazar-Albornoz;S. Contreras;S. Cora;A. Ruiz
影响因子：
4.8
作者：
A. Rodríguez-Puebla;P. Behroozi;J. Primack;A. Klypin;Christoph T. Lee;Doug Hellinger University of California;Santa Cruz;U. California;Berkeley;N. University;L. Cruces
通讯作者：
A. Rodríguez-Puebla;P. Behroozi;J. Primack;A. Klypin;Christoph T. Lee;Doug Hellinger University of California;Santa Cruz;U. California;Berkeley;N. University;L. Cruces
影响因子：
64.8
作者：
Springel, V;White, SDM;Pearce, F
通讯作者：
Pearce, F
暗物质晕中的角动量演化
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
L. Book;A. Brooks;A. Peter;A. Benson;Fabio Governato California Institute of Technology;A. Department;U. Washington
通讯作者：
U. Washington