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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
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume10Issue:12Pages:1215-1222
AbstractStandard 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
KeywordCosmology Theory Dark Matter Galaxies Halos Gravitational Lensing Strong
Indexed BySCI
Language英语
WOS IDWOS:000285676800003
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7742
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Maryland, Dept Astron, College Pk, MD 20742 USA
Recommended Citation
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.
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