Astrophysics (Index)About

intergalactic medium

(matter between galaxies)

The intergalactic medium (IGM) is matter such as dust and gas between galaxies. Similar matter between stars within a galaxy is called the interstellar medium. Between galaxies it is often plasma in filaments, mostly ionized hydrogen.

The IGM can heat to 105 to 107 K, called the warm-hot intergalactic medium (WHIM), observed in ultraviolet and low-energy X-ray radiation.

The intracluster medium has a similar meaning, but more specifically means the medium within a galaxy cluster.

Further reading:

Referenced by pages:
cold gas
dispersion measure (DM)
epoch of reionization (EOR)
star formation feedback
fast radio burst (FRB)
galaxy cluster (CL)
Gunn-Peterson trough
interplanetary medium (IPM)
interstellar medium (ISM)
Lyman-alpha forest
mass density
plasma astrophysics
ram pressure
radio galaxy (RG)
spiral galaxy
star formation (SF)
X-ray source