Jet (astrophysical)
See also: Jet
In Astrophysical, a jet is a collimated flow of Matière ejected by a Celestial object.
Mechanism
The jets are often associated with the discs of accretion in magnetic structures of accretion-ejection whose properties and operation are still the controversy object. The jets require a “engine” which ejects the matter and a collimating process ; the majority of the authors agree on the big role of the Magnetic field. , , ,
Objects concerned
In galactic physics one finds the jets among a certain number of young stars like around stellar black holes. Into extragalactic are concerned the active cores of galaxies (NAG) and the Microquasar S; in these two cases a black hole is the compact object at the origin of the ejection.When they are associated with the presence of a central Black hole they are often Relativiste S. By effect of prospect they can then give the illusion to move more quickly than the light (as opposed to what predicted the restricted Relativité, which stipulates that the matter cannot exceed the Speed of light in the vacuum), but it is acted in fact of a simple optical illusion. These jets are however described as supraluminic .
The jets can cause shock S in the interstellar Milieu because they generally have a supersonic speed. , the majority of the objects Herbig-Haro is structures associated with the jets coming from young stars and is interpreted like shocks.
See too
Related articles
- Black hole
- Object Herbig-Haro
- active Core of galaxy
- Microquasar
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