SHAPES OF GAS, GRAVITATIONAL POTENTIAL, AND DARK MATTER IN Lambda CDM CLUSTERS
文献类型：期刊论文
| 作者 | Lau, Erwin T.1,2; Nagai, Daisuke3,4; Kravtsov, Andrey V.1,5,6; Zentner, Andrew R.7 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-06-20 |
| 卷号 | 734期号:2 |
| 关键词 | cosmology: theory galaxies: clusters: general methods: numerical X-rays: galaxies: clusters |
| 英文摘要 | We present analysis of the three-dimensional shape of intracluster gas in clusters formed in cosmological simulations of the Lambda CDM cosmology and compare it to the shape of dark matter distribution and the shape of the overall isopotential surfaces. We find that in simulations with radiative cooling, star formation, and stellar feedback (CSF), intracluster gas outside the cluster core (r >= 0.1r(500)) is more spherical compared to non-radiative (NR) simulations, while in the core the gas in the CSF runs is moretriaxial and has a distinctly oblate shape. The latter reflects the ongoing cooling of gas, which settles into a thick oblate ellipsoid as it loses thermal energy. The shape of the gas in the inner regions of clusters can therefore be a useful diagnostic of gas cooling. We find that gas traces the shape of the underlying potential rather well outside the core, as expected in hydrostatic equilibrium. At smaller radii, however, the gas and potential shapes differ significantly. In the CSF runs, the difference reflects the fact that gas is partly rotationally supported. Interestingly, we find that in NR simulations the difference between gas and potential shape at small radii is due to random gas motions, which make the gas distribution more spherical than the equipotential surfaces. Finally, we use mock Chandra X-ray maps to show that the differences in shapes observed in a three-dimensional distribution of gas are discernible in the ellipticity of X-ray isophotes. Contrasting the ellipticities measured in simulated clusters against observations can therefore constrain the amount of cooling in the intracluster medium and the presence of random gas motions in cluster cores. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | X-RAY MEASUREMENTS ; GALAXY FORMATION ; INTRACLUSTER MEDIUM ; ANGULAR-MOMENTUM ; HALOS ; SIMULATIONS ; UNIVERSE ; CONSTRAINTS ; ALIGNMENTS ; COSMOLOGY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000291386500021 |
| 源URL | [http://119.78.226.72/handle/331011/28110]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA 2.Partner Grp MPA, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Yale Univ, Dept Phys, New Haven, CT 06520 USA 4.Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA 5.Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA 6.Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA 7.Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA |
| 推荐引用方式 GB/T 7714 | Lau, Erwin T.,Nagai, Daisuke,Kravtsov, Andrey V.,et al. SHAPES OF GAS, GRAVITATIONAL POTENTIAL, AND DARK MATTER IN Lambda CDM CLUSTERS[J]. ASTROPHYSICAL JOURNAL,2011,734(2). |
| APA | Lau, Erwin T.,Nagai, Daisuke,Kravtsov, Andrey V.,&Zentner, Andrew R..(2011).SHAPES OF GAS, GRAVITATIONAL POTENTIAL, AND DARK MATTER IN Lambda CDM CLUSTERS.ASTROPHYSICAL JOURNAL,734(2). |
| MLA | Lau, Erwin T.,et al."SHAPES OF GAS, GRAVITATIONAL POTENTIAL, AND DARK MATTER IN Lambda CDM CLUSTERS".ASTROPHYSICAL JOURNAL 734.2(2011). |
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来源：上海天文台
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