Roche lobe shapes for testing MOND-like modified gravities
文献类型：期刊论文
| 作者 | Zhao, H; Tian, L |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2006-05-01 |
| 卷号 | 450期号:3页码:1005-1012 |
| 关键词 | dark matter galaxy : kinematics and dynamics gravitation galaxies : dwarf globular clusters : general galaxies : halos |
| ISSN号 | 0004-6361 |
| 英文摘要 | Dark Matter (DM) theories and mass-tracing-light theories like MOND are by construction nearly degenerate on galactic scales, but not when it comes to the predicted shapes of Roche Lobes of a two-body system (e.g., a globular cluster orbiting a host galaxy). We show that the flattening of the Roche lobe is sensitive to the function mu(g) in modification of the law of gravity. We generalise the analytical results obtained in the deep-MOND limit by Zhao (2005), and consider a binary in the framework of a MOND-like gravity modification function mu(g) or a general non-Keplerian gravity g proportional to R-zeta. We give analytical expressions for the inner Lagrange point and Robe lobe axis ratios. The Roche lobe volume is proven to scale linearly with the true mass ratio, which applies to any mu(g), hence mass-tracing light models would overpredict the Roche lobe of a DM-poor globular cluster in a DM-rich host galaxy, and underpredict the size of a DM-richer dwarf satellite. The lobes are squashed with the flattening similar to 0.4 in the strong gravity and similar to 0.6 in the weak gravity; a precise measurement of the flattening could be used to verify the anisotropic dilation effect which is generic to MOND-like gravity. We generalise these results for extended mass distribution, and compare predicted Roche radii with limiting radii of observed globular clusters and dwarf galaxy satellites. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MODIFIED NEWTONIAN DYNAMICS ; GALACTIC GLOBULAR-CLUSTERS ; MILKY-WAY ; DARK-MATTER ; TIDAL RADII ; MASS ; GALAXIES ; CONSTRAINTS ; PARAMETERS ; HALO |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000236797400014 |
| 公开日期 | 2012-02-07 |
| 源URL | [http://159.226.72.40/handle/332002/3644]  |
| 专题 | 紫金山天文台_期刊（老文献） |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada |
| 推荐引用方式 GB/T 7714 | Zhao, H,Tian, L. Roche lobe shapes for testing MOND-like modified gravities[J]. ASTRONOMY & ASTROPHYSICS,2006,450(3):1005-1012. |
| APA | Zhao, H,&Tian, L.(2006).Roche lobe shapes for testing MOND-like modified gravities.ASTRONOMY & ASTROPHYSICS,450(3),1005-1012. |
| MLA | Zhao, H,et al."Roche lobe shapes for testing MOND-like modified gravities".ASTRONOMY & ASTROPHYSICS 450.3(2006):1005-1012. |
入库方式： OAI收割
来源：紫金山天文台
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