(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.
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:
Fornax, Hercules, Coma.
The abbreviation CL is often included in designators for
galaxy clusters, e.g., for CL J1001+0220.
The term cluster can also refer to stellar clusters
such as open clusters, sometimes confusingly
called galactic clusters (meaning clusters within a galaxy).
|CL||CL J1001+0220||galaxy cluster||general prefix for clusters|
Atacama Cosmology Telescope (ACT)
brightest cluster galaxy (BCG)
cold dark matter (CDM)
Catalog of Galaxies and Clusters of Galaxies (CGCG)
cosmic infrared background (CIB)
cosmic distance ladder
dark matter halo
Dark Energy Survey (DES)
velocity dispersion (σ)
gravitational instability (GI)
gravitational instability model
intracluster medium (ICM)
intergalactic medium (IGM)
Lambda-CDM model (ΛCDM)
large scale structure (LSS)
luminosity function (LF)
Massive Cluster Survey (MACS)
planetary nebula luminosity function (PNLF)
star formation history (SFH)
South Pole Telescope (SPT)
supergalactic coordinate system
Sachs-Wolfe effect (SWE)
Sunyaev-Zel'dovich effect (SZ Effect)
three dimensional model