Astrophysics (index)

Interstellar Medium

(ISM)
(matter in a galaxy between star systems)

The Interstellar Medium (ISM) is matter such as Cosmic Dust and gas between stars. (Matter between entire galaxies is called the Intergalactic Medium (IGM).) The gas may be ionized, neutral, or molecular. Density varies from as little as 1 per 10,000 cm3 to 1,000,000 per cm3. The interstellar medium was first deduced through observed Absorption Lines.

Types of ISM regions that have been detected:

  • Molecular Clouds, 10-20K
  • cold neutral medium (CNM), 50-100K
  • warm neutral medium (WNM), 6000-10000K
  • warm ionized medium (WIM), 8000K
  • HII Regions (HII), 8000K
  • Coronal gas/Hot Ionized Medium (HIM), 1000-3000k

(gas,dust)
http://en.wikipedia.org/wiki/Interstellar_medium
http://www.astronomy.ohio-state.edu/~pogge/Ast871/Notes/Intro.pdf

Referenced by:
Abundances
Bipolar Outflow
Methylidyne (CH)
Cold Gas
Cosmic Dust
Dense Core Mass Function (DCMF)
Diffractive Interstellar Scintillation (DISS)
EMPIRE Survey
Extreme Ultraviolet (EUV)
Extinction
Glycine (Gly)
Heliopause
Heliosheath
Hydrogen (H)
Intergalactic Medium (IGM)
Interstellar Holography
Interplanetary Medium (IPM)
Magnetohydrodynamics (MHD)
Plasma Frequency
Refractive Interstellar Scintillation (RISS)
RT Instability
Scintillometry
Shock Wave
Submillimeter Galaxy (SMG)
Solar Wind

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