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Publication

CODEX weak lensing: concentration of galaxy clusters at z similar to 0.5

Jean-Paul Richard Kneib, Huanyuan Shan
2017
Journal Articles

Abstract

We present a stacked weak-lensing analysis of 27 richness selected galaxy clusters at 0.40

Official source

https://infoscience.epfl.ch/entities/publication/e2811d3a-28cd-4dce-b513-8b6fc595674f

About this result

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Jean-Paul Richard Kneib, Huanyuan Shan
2017
Journal Articles

Abstract

We present a stacked weak-lensing analysis of 27 richness selected galaxy clusters at 0.40

Official source

https://infoscience.epfl.ch/entities/publication/e2811d3a-28cd-4dce-b513-8b6fc595674f

About this result

Ontological neighbourhood

Astronomy

Astrophysics: Physical cosmology

Related concepts (32)

Galaxy groups and clusters

Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. They form the densest part of the large-scale structure of the Universe. In models for the gravitational formation of structure with cold dark matter, the smallest structures collapse first and eventually build the largest structures, clusters of galaxies. Clusters are then formed relatively recently between 10 billion years ago and now.

Galaxy cluster

A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, with typical masses ranging from 1014 to 1015 solar masses. They are the second-largest known gravitationally bound structures in the universe after galaxy filaments and were believed to be the largest known structures in the universe until the 1980s, when superclusters were discovered. One of the key features of clusters is the intracluster medium (ICM).

Virgo Cluster

The Virgo Cluster is a large cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. Comprising approximately 1,300 (and possibly up to 2,000) member galaxies, the cluster forms the heart of the larger Virgo Supercluster, of which the Local Group (containing our Milky Way galaxy) is a member. The Local Group actually experiences the mass of the Virgo Supercluster as the Virgocentric flow. It is estimated that the Virgo Cluster's mass is 1.

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