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The Santa Barbara cluster comparison project: a comparison of cosmological hydrodynamics solutions

ColdThunder 添加于 2010-8-3 14:34 | 2021 次阅读 | 0 个评论

作者
Frenk CS, White SDM, Bode P, Bond JR, Bryan GL, Cen R, Couchman HMP, Evrard AE, Gnedin N, Jenkins A, Khokhlov AM, Klypin A, Navarro JF, Norman ML, Ostriker JP, Owen JM, Pearce FR, Pen U-L, Steinmetz M, Thomas PA, Villumsen JV, Wadsley JW, Warren MS, Xu G, Yepes G
摘要
We have simulated the formation of an X-ray cluster in a cold dark matter universe using 12 different codes. The codes span the range of numerical techniques and implementations currently in use, including SPH and grid methods with fixed, deformable or multilevel meshes. The goal of this comparison is to assess the reliability of cosmological gas dynamical simulations of clusters in the simplest astrophysically relevant case, that in which the gas is assumed to be non-radiative. We compare images of the cluster at different epochs, global properties such as mass, temperature and X-ray luminosity, and radial profiles of various dynamical and thermodynamical quantities. On the whole, the agreement among the various simulations is gratifying although a number of discrepancies exist. Agreement is best for properties of the dark matter and worst for the total X-ray luminosity. Even in this case, simulations that adequately resolve the core radius of the gas distribution predict total X-ray luminosities that agree to within a factor of two. Other quantities are reproduced to much higher accuracy. For example, the temperature and gas mass fraction within the virial radius agree to about 10%, and the ratio of specific kinetic to thermal energies of the gas agree to about 5%. Various factors contribute to the spread in calculated cluster properties, including differences in the internal timing of the simulations. Based on the overall consistency of results, we discuss a number of general properties of the cluster we have modelled.
详细资料
- 关键词: astro-ph
- 文献种类:期刊
- 期刊缩写: Astrophys. J.
- 期卷页: 1999年第525卷 554-582页
- 地址: Frenk: Durham; White: MPA, Garching
- 备注:arXiv:astro-ph/9906160v1; 18 pages, 11 figures, 8 additional colour figures available from http://star-www.dur.ac.uk/~csf/SantaBarbara/ Accepted in Astrophysical Journal; Journal Ref: Astrophys.J.525:554-582,1999
标签

hydrodynamic simulation
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