Astrophysics (index)

Intergalactic Medium

(matter between galaxies)

The Intergalactic Medium (IGM) is matter such as Cosmic Dust and gas between galaxies. Similar matter between stars within a galaxy is called the Interstellar Medium (ISM). Between galaxies it is often Plasma in filaments, mostly ionized Hydrogen (H).

The IGM can heat to 10*5 to 10*7 K, called the warm-hot intergalactic medium (WHIM), observed in Ultraviolet (UV) and low-energy X-ray radiation.

The Intracluster Medium (ICM) has a similar meaning, but more specifically means the medium within a Galaxy Cluster (CL).


Referenced by:
Cold Gas
Fast Radio Burst (FRB)
Galaxy Cluster (CL)
Gunn-Peterson Trough
Interplanetary Medium (IPM)
Interstellar Medium (ISM)
Lyman-Alpha Forest
Ram Pressure