interstellar medium
(ISM)
(matter in a galaxy between star systems)
The interstellar medium (ISM) is
matter such as dust and gas between stars.
(Matter between entire galaxies is called the intergalactic medium.)
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, generally 10-20K temperature.
- cold neutral medium (CNM), 50-100K.
- warm neutral medium (WNM), 6000-10000K.
- warm ionized medium (WIM), 8000K.
- HII regions, 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)
infrared cirrus
Cloudy
cold gas
cosmic dust
dark matter
dark matter halo
dense core mass function (DCMF)
diffractive interstellar scintillation (DISS)
EMPIRE Survey
extreme ultraviolet (EUV)
extinction
star formation feedback
galactic electron density
glycine (Gly)
heliopause
heliosheath
hydrogen (H)
ionization correction factor (ICF)
intergalactic medium (IGM)
Interstellar Medium Absorption Profile Spectrograph (IMAPS)
interstellar holography
interplanetary medium (IPM)
lithium (Li)
mass density
magnetohydrodynamics (MHD)
plasma frequency
pulsar (PSR)
refractive interstellar scintillation (RISS)
RT instability
scintillometry
shock wave
submillimeter galaxy (SMG)
solar wind
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