Interstellar environment

In , it interstellar environment is it rarefied which, in one , exists between and their close environment. This gas is usually extremely thin, with typical going from some tenth to some hundredth of a particle per cubic centimeter. Generally this gas is roughly made up of 90% of and of 10% of; others , what the astronomers call of " metals ", are present only in the form of traces. Still more exceptionally, of complete was observed in interstellar space (the largest brought back molecule is glycoaldéhyde, a molecule of 8 atoms, detected in Sagitarrius B2 by radio telescope of 12m of Kitt Peak).

The interstellar environment is usually divided into three phases, according to the temperature of gas: very hot (million ), heat (thousands of Kelvin) and cold (tens of Kelvin). This model in three phases was developed by Chris McKee and Jerry Ostriker in an article published in and which was used as a basis for the studies undertaken during the 25 years which followed. The relative proportions of these phases is still always matter with controversy in the scientific circles.

The principal subjects of study of the interstellar environment are: molecular clouds, them , them remainders of supernova, them as well as other diffuse structures.

Advanced in the study of the instellaire medium

See too


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