Comparisons between isothermal and NFW mass profiles for strong-lensing galaxy clusters

	Comparisons between isothermal and NFW mass profiles for strong-lensing galaxy clusters
	Shu, Chenggang 1,2,3; Zhou, Binglu 1,2; Bartelmann, Matthias 2; Comerford, Julia M.4; Huang, J. -S.5; Mellier, Yannick 6
刊名	ASTROPHYSICAL JOURNAL
	2008-09-20
卷号	685 期号:1 页码:70-82
关键词	dark matter galaxies : clusters : individual (MS 2137 gravitational lensing A370)
英文摘要	While both isothermal and NFW-based mass models for galaxy clusters are widely adopted in strong-lensing studies, they cannot easily be distinguished based solely on observed positions of arcs and arclets. We compare the magnifications predicted for giant arcs obtained from isothermal and NFW profiles, taking axially symmetric and asymmetric mass distributions into account. We find that arc magnifications can differ strongly between the two types of density profile even if the image morphology is well reproduced. Magnifications by lenses with NFW density profiles are usually larger than those for lenses with singular or nearly singular isothermal density profiles, unless the latter have large cores. Asymmetries play an important role. We illustrate our results with the two well-studied clusters, MS 2137 and A370. We confirm earlier results showing that both isothermal and NFW mass models can very well reproduce the observed arcs, radial arcs, and other arclets. While the mass model for MS 2137 is not very well constrained, the two types of mass models produce strongly differing critical curves and caustics for A370. We find that the NFW mass profile is preferred for A370. We identify new arclet candidates in the field of A370. Redshift estimates allowed by the lens model are consistent with results in the literature, where available. Three newly found counterimages are suggested to arise from an active, dust-enshrouded star-forming galaxy at z approximate to 1.1.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	HUBBLE-SPACE-TELESCOPE ; GIANT LUMINOUS ARCS ; DARK-MATTER ; GRAVITATIONAL ARCS ; DISTANT CLUSTER ; ADVANCED CAMERA ; ABELL-1689 ; STATISTICS ; ABELL-370 ; CONSTRAINTS
收录类别	SCI
语种	英语
WOS记录号	WOS:000259314200006
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19522]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Normal Univ, Shanghai 200234, Peoples R China 2.Univ Heidelberg, ITA, Zentrum Astron, D-69120 Heidelberg, Germany 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA 5.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 6.Inst Astrophys, UMR 7095, F-75014 Paris, France
推荐引用方式 GB/T 7714	Shu, Chenggang,Zhou, Binglu,Bartelmann, Matthias,et al. Comparisons between isothermal and NFW mass profiles for strong-lensing galaxy clusters[J]. ASTROPHYSICAL JOURNAL,2008,685(1):70-82.
APA	Shu, Chenggang,Zhou, Binglu,Bartelmann, Matthias,Comerford, Julia M.,Huang, J. -S.,&Mellier, Yannick.(2008).Comparisons between isothermal and NFW mass profiles for strong-lensing galaxy clusters.ASTROPHYSICAL JOURNAL,685(1),70-82.
MLA	Shu, Chenggang,et al."Comparisons between isothermal and NFW mass profiles for strong-lensing galaxy clusters".ASTROPHYSICAL JOURNAL 685.1(2008):70-82.