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Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem
Chen, Da-Ming1; McGaugh, Stacy2
2010-12-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号10期号:12页码:1215-1222
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
关键词Cosmology Theory Dark Matter Galaxies Halos Gravitational Lensing Strong
收录类别SCI
语种英语
WOS记录号WOS:000285676800003
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7742
专题星系宇宙学研究部
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
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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.
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