Astrophysics (Index)About


(polar jet, astrophysical 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 magnetism (e.g., magnetic field under rotation) is presumed to be a component. Bodies with accretion disks such as protostars, neutron stars often show jets as well as active galaxies often show jets sent in one or both directions along the axis of rotation, polar jets or disk wind. A relativistic jet is one in which matter is emitted at speeds approaching light speed.

For active galaxies, they are termed AGN jets or galactic jets. In the case of stars (stellar jets), high stellar rotation makes them oblate, and the surface at the poles is nearer the core, thus hotter, contributing to jet formation.

The word jet is also sometimes short for jet stream, a type of wind on a planet (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 astrophysics
relativistic beaming
radio galaxy (RG)
radio source (RS)
shock wave
spectral line
SS 433
Sun surface features
superluminal motion
superrotating wind
symbiotic binary (SS)
tidal disruption event (TDE)
telegrapher's equations
3C 273
3C 279
3C 303
3C 348
3C 9
three dimensional model
young stellar object (YSO)
zonal flow