Publication

The nongravitational interactions of dark matter in colliding galaxy clusters

David Richard Harvey, Richard Massey
2015
Journal Articles

Abstract

Collisions between galaxy clusters provide a test of the nongravitational forces acting on dark matter. Dark matter's lack of deceleration in the "bullet cluster" collision constrained its self-interaction cross section sigma(DM)/m

Official source

https://infoscience.epfl.ch/entities/publication/463d333c-66b3-4211-965d-4aafcec1907a

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David Richard Harvey, Richard Massey
2015
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/463d333c-66b3-4211-965d-4aafcec1907a

About this result

Related concepts (30)

Bullet Cluster

The Bullet Cluster (1E 0657-56) consists of two colliding clusters of galaxies. Strictly speaking, the name Bullet Cluster refers to the smaller subcluster, moving away from the larger one. It is at a comoving radial distance of . Gravitational lensing studies of the Bullet Cluster are claimed to provide the best evidence to date for the existence of dark matter. Observations of other galaxy cluster collisions, such as MACS J0025.4-1222, similarly support the existence of dark matter.

Dark matter

Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect. Various astrophysical observations - including gravitational effects which cannot be explained by currently accepted theories of gravity unless more matter is present than can be seen - imply dark matter's presence.

Dark matter halo

According to modern models of physical cosmology, a dark matter halo is a basic unit of cosmological structure. It is a hypothetical region that has decoupled from cosmic expansion and contains gravitationally bound matter. A single dark matter halo may contain multiple virialized clumps of dark matter bound together by gravity, known as subhalos. Modern cosmological models, such as ΛCDM, propose that dark matter halos and subhalos may contain galaxies.

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CURLING - I. The influence of point-like image approximation on the outcomes of cluster strong lens modelling

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