Astrophysics (Index)About


(polar jet)
(stream of matter from an astronomical body)

A jet (or polar jet) is a stream of matter (e.g., plasma) sent with apparent force from an astronomical body such as a black hole. Their mechanism is not agreed upon, but some theories incorporate magnetism. Bodies with accretion disks such as protostars as well as active galaxies often show jets called "polar jets" sent in one or both directions along the axis of rotation. In such cases, they may be referred to as disk wind. They are called relativistic jets when the matter is emitted at speeds approaching light speed.

In the case of stars, high stellar rotation makes them oblate, and the surface at the poles is nearer the core, thus hotter, and jets can form.

The word jet is also in the phrase jet stream, which is sometimes shortened to jet (see zonal flow).

(physics,accretion disk,black holes,relativistic jet,object type)
Further reading:

Referenced by pages:
active galaxy
active galactic nucleus (AGN)
bipolar outflow
Blandford-Znajek mechanism (BZ process)
Blandford-Payne mechanism (BP process)
Cygnus A (3C 405)
star formation feedback
gravitational lensing
Herbig-Haro object (HH)
jet current
Messier 84 (M84)
Mach number
mass loading
Meier paradox
Poynting vector (S)
radio relics
relativistic beaming
radio source (RS)
shock wave
spectral line
SS 433
superluminal motion
superrotating wind
symbiotic binary (SS)
tidal disruption event (TDE)
telegrapher's equations
3C 273
3C 303
3C 9
three dimensional model
young stellar object (YSO)
zonal flow