.png){kind=icon}
返回
A universal temperature profile for galaxy clusters
.png){kind=icon}
OA
AI
DOI：10.1086/342825.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
We investigate the predicted present-day temperature profiles of the hot, X-ray-emitting gas in galaxy clusters for two cosmological models a current best-guess LambdaCDM model and a standard cold dark matter (SCDM) model. Our numerically simulated catalogs of clusters are derived from high-resolution (15 h(-1) kpc) simulations which make use of a sophisticated, Eulerian-based, adaptive mesh-refinement code that faithfully captures the shocks that are essential for correctly modeling cluster temperatures. We show that the temperature structure on Mpc scales is highly complex and non-isothermal. However, the temperature profiles of the simulated LambdaCDM and SCDM clusters are remarkably similar and drop off as T proportional to (1+r/a(x))(-delta), where a(x)similar tor(vir)/1.5 and deltasimilar to1.6. This decrease is in good agreement with the observational results of Markevitch et al. but diverges, primarily in the innermost regions, from their fit which assumes a polytropic equation of state. Our result is also in good agreement with a recent sample of clusters observed by BeppoSAX, though there is some indication of missing physics at small radii (r<0.2 r(vir)). We discuss the interpretation of our results and make predictions for new X-ray observations that will extend to larger radii than previously possible. Finally, we show that for r>0.2 r(vir), our universal temperature pro le is consistent with our most recent simulations, which include both radiative cooling and supernovae feedback.
Keyword:
cosmology : theory
galaxies : clusters : general
hydrodynamics
intergalactic medium
X-rays : galaxies
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
机构
暂无机构信息
引用论文
分享收藏Facile and Convenient One-Pot Process for the Synthesis of Spirooxindole Derivatives in High Optical Purity Using (−)-(S)-Brevicolline as an Organocatalyst.png)
SymmetryOAAI
SymmetryIF0
OAAI分享收藏Introduction of O-sulfonated poly(4-vinylpyrrolidonium) chloride as a polymeric and reusable catalyst for the synthesis of xanthene derivativesRSC Advances
RSC AdvancesIF0
PREAI
分享收藏The Santa Barbara cluster comparison project: A comparison of cosmological hydrodynamics solutionsOAAI
OAAI分享收藏
查看更多内容