Fr.: polarisation interstellaire
interstellar radiation field
meydân-e tâbeš andaraxtari
Fr.: champ de rayonnement interstellaire
A global ionizing radiation in the → interstellar medium provided by various sources all together.
Fr.: rougissement interstellaire
The dimming of light during its travel in the → interstellar medium due to absorption by → intervening → dust grains. Since shorter wavelengths are particularly affected, the spectrum of the light is increasingly dominated by the long wavelength end of the spectrum. As a result, the light is "reddened" as it travels through space. Robert J. Trumpler (1886-1956), a Swiss-American astronomer, was the first to produce a definite evidence of the existence of → interstellar extinction and to estimate its magnitude (1930).
interstellar reddening curve
xam-e sorxeš-e andaraxtari
Fr.: courbe de rougissement interstellaire
A graph showing the relation between → interstellar absorption (in magnitudes) and wavelength.
Fr.: scintillation interstellaire
An apparent twinkling of the signals from distant point-like radio sources (pulsars). It is due to turbulence, i.e. fluctuations in the electron density of the interstellar ionized gas, through which the signals have passed on their way to Earth.
local interstellar cloud
abr-e andar-axtari-ye mahali
Fr.: nuage interstellaire local
violent interstellar environment
pargir-e andar-axtari-ye surâ
Fr.: environnement interstellaire violent
A description of the interstellar medium justified by the presence of supersonic shock waves, massive star winds, turbulence, supernova explosions, etc.