Astrophysics (index)about

interstellar medium

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

The interstellar medium (ISM) is matter such as gas and dust between stars. (Matter between entire galaxies is called the intergalactic medium.) Depending upon circumstance, 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 (compared to about 2.5×1019 per cm3 for dry air at sea level). The ISM's existence was first deduced through observed absorption lines.

There is a nesting of types of ISM:

A diffuse interstellar band (DIB) is an absorption spectral band affecting observations of stars and other objects. Such bands are attributed to polycyclic aromatic hydrocarbons in the ISM.


(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
bow shock
methylidyne (CH)
CHIPSat
infrared cirrus
Cloudy
cold gas
cosmic dust
dark matter (DM)
dark matter halo
dense core mass function (DCMF)
diffuse interstellar bands (DIBs)
diffractive interstellar scintillation (DISS)
extragalactic background light (EBL)
EMPIRE Survey
extreme ultraviolet (EUV)
extinction
star formation feedback
galactic electron density
glycine (Gly)
helium 1083nm line
heliopause
heliosheath
heliosphere
Herbig-Haro object (HH)
homologous collapse
hydrogen (H)
ionization correction factor (ICF)
intergalactic medium (IGM)
Interstellar Medium Absorption Profile Spectrograph (IMAPS)
interstellar holography
ionizing radiation
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)
supernova remnant (SNR)
solar wind

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