Astrophysics (index)

Galaxy Cluster

(CL, Cluster)
(large group of galaxies gravitationally-bound to the group)

A Galaxy Cluster (CL) is on the order of hundreds of galaxies bound to the group by Gravity. A smaller group of galaxies is known as a Galaxy Group. Often has an Intergalactic Medium (IGM), i.e., Plasma. Typical mass is on the order of 1015 solar masses. It can be part of a Supercluster.

Cluster can also refer to star clusters such as Open Clusters, sometimes confusingly called Galactic Clusters (i.e., clusters within a galaxy).

Shock Waves from matter striking a galaxy cluster's Intracluster Medium (ICM) produces X-rays, which are a sign to observers of the presence of a galaxy cluster. X-ray signals can reveal very distant clusters, the furthest currently known (CL J1001+0220) at Redshift (z) 2.5.

Example galaxy clusters: Virgo, Fornax, Hercules, Coma.

The abbreviation CL is often included in designators for galaxy clusters, e.g., for CL J1001+0220.

(galaxies,object type)
CLCL J1001+0220Galaxy Clustergeneral prefix for clusters

Referenced by:
Atacama Cosmology Telescope (ACT)
Alcock-Paczyński Effect
Astronomical Quantities
Brightest Cluster Galaxy (BCG)
Bullet Cluster
Cold Dark Matter (CDM)
Cosmic Infrared Background (CIB)
Cluster Radius
CMB Lensing
Comoving Units
Compton Scattering
Computational Astrophysics
Cosmological Principle
Dark Flow
Dark Matter
Dark Matter Halo
Dark Energy Survey (DES)
Velocity Dispersion (σ)
Elliptical Galaxy
Galaxy Bias
Galaxy Filament
Galaxy Group
Gas Fraction
Hydra-Centaurus Supercluster
Intracluster Medium (ICM)
Intergalactic Medium (IGM)
Lambda-CDM model (ΛCDM)
Laniakea Supercluster
Large Scale Structure (LSS)
Luminosity Function (LF)
Metallicity (Z)
Mock Catalog
Non Gaussian (NG)
Perseus-Pisces Supercluster
Star Formation History (SFH)
South Pole Telescope (SPT)
Supergalactic Coordinate System
Sachs-Wolfe Effect (SWE)
Sunyaev-Zel'dovich Effect (SZ Effect)
Three Dimensional Model
21cm Experiment
21cm Line
Virial Theorem
Weak Lensing