Astrophysics (index)about

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, 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 Stellar Clusters such as Open Clusters, sometimes confusingly called Galactic Clusters (meaning clusters within a galaxy).

Shock Waves from matter striking a galaxy cluster's Intracluster Medium 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 2.5.

Example galaxy clusters: Virgo Cluster, 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:
Abell Catalog
Atacama Cosmology Telescope (ACT)
Alcock-Paczyński Effect
Astronomical Quantities
Brightest Cluster Galaxy (BCG)
Bullet Cluster
Cold Dark Matter (CDM)
Catalog Of Galaxies And Clusters Of Galaxies (CGCG)
Cosmic Infrared Background (CIB)
Cluster Radius
CMB Lensing
Comoving Units
Compton Scattering
Computational Astrophysics
Cosmic Distance Ladder
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
Gravitational Instability Model
Gravitational Lensing
Gravitational Redshift
Hydra-Centaurus Supercluster
Intracluster Medium (ICM)
Intergalactic Medium (IGM)
Lambda-CDM model (ΛCDM)
Laniakea Supercluster
Large Scale Structure (LSS)
Luminosity Function (LF)
Massive Cluster Survey (MACS)
Metallicity (Z)
Mock Catalog
Non Gaussian (NG)
Perseus-Pisces Supercluster
Planetary Nebula Luminosity Function (PNLF)
Radio Relics
Redshift Survey
Scott Effect
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
Virgo Cluster
Virial Theorem
Weak Lensing