Constraints on the Collisional Nature of the Dark Matter from Gravitational Lensing in the Cluster A2218 | Zendy

Priyamvada Natarajan | Zendy; Abraham Loeb | Zendy; JeanPaul Kneib | Zendy; Ian Smail | Zendy

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Constraints on the Collisional Nature of the Dark Matter from Gravitational Lensing in the Cluster A2218

Author(s) -

Priyamvada Natarajan,

Abraham Loeb,

JeanPaul Kneib,

Ian Smail

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/345547

Subject(s) - physics , dark matter , astrophysics , galaxy cluster , gravitational lens , cluster (spacecraft) , mass distribution , weak gravitational lensing , galaxy , dark matter halo , scalar field dark matter , halo , hot dark matter , cosmology , dark energy , redshift , computer science , programming language

The detailed distribution of mass within clusters of galaxies can be used toprobe the nature of dark matter. We show that constraints on the extent of themass distribution around galaxies in the rich cluster Abell 2218 obtained fromcombining strong and weak lensing observations are consistent with thepredictions which assume that the dominant mass component (dark matter) inthese halos is collisionless. A strongly interacting (fluid-like) dark matteris ruled-out at a confidence level of more than 5-sigma.Comment: minor revisions, ApJ Letters in press, matches print versio

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