Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem
文献类型：期刊论文
| 作者 | Chen, Da-Ming1 ; McGaugh, Stacy2
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2010-12-01 |
| 卷号 | 10期号:12页码:1215-1222 |
| 关键词 | cosmology theory dark matter galaxies halos gravitational lensing strong |
| 英文摘要 | Standard cosmology has many successes on large scales, but faces some fundamental difficulties on small, galactic scales One such difficulty is the cusp/core problem High resolution observations of the rotation curves for dark matter dominated low surface brightness (LSB) galaxies imply that galactic dark matter halos have a density profile with a flat central core, whereas N-body structure formation simulations predict a divergent (cuspy) density profile at the center It has been proposed that this problem can be resolved by stellar feedback driving turbulent gas motion that erases the initial cusp However, strong gravitational lensing prefers a cuspy density profile for galactic halos In this paper, we use the most recent high resolution observations of the rotation curves of LSB galaxies to fit the core size as a function of halo mass, and compare the resultant lensing probability to the observational results for the well defined combined sample of the Cosmic Lens All-Sky Survey (CLASS) and Jodrell Bank/Very Large Array Astrometric Survey (JVAS) The lensing probabilities based on such density profiles are too low to match the observed lensing in CLASS/JVAS High baryon densities in the galaxies that dominate the lensing statistics can reconcile this discrepancy, but only if they steepen the mass profile rather than making it more shallow This places contradictory demands upon the effects of baryons on the central mass profiles of galaxies |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000285676800003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7742]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Maryland, Dept Astron, College Pk, MD 20742 USA |
| 推荐引用方式 GB/T 7714 | Chen, Da-Ming,McGaugh, Stacy. Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(12):1215-1222. |
| APA | Chen, Da-Ming,&McGaugh, Stacy.(2010).Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(12),1215-1222. |
| MLA | Chen, Da-Ming,et al."Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.12(2010):1215-1222. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。