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virialization viriayleš Fr.: virialisation The process whereby a system of gravitationally interacting particles
attains stability. The comparable mass components interact with each other, but the
whole system does not expand or collapse. Virialization occurs when
the → K
(→ _{vir}virial theorem).
In the case of a → galaxy cluster,
when the cluster is virialized the merging process and the collapse of
matter have finished and the formation process of the galaxy cluster
is considered to be done. A cluster has formed by
→ hierarchical clustering.
Virialized
clusters, in other words finished clusters, can be found by looking at
their radius and density. A cluster is virialized when it satisfies the
condition:
R ~ _{vir}R/2,
where _{max}R is the radius when the cluster is virialized and
_{vir}R is the radius when the collapse starts.
From this
condition it follows that the object is 8 times denser at
virialization than when the collapse started._{max}Verbal noun of → |