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GX 339-4 is a moderately strong variable galactic 
During the outbursts GX 339-4 shows evolution of quasi-periodic oscillations (QPOs). In the rising phase the QPO frequency monotonically increase as the
modeled by the propagating and oscillating shock
in the sub-Keplerian flow. The entire spectrum also fits very well usin
two component advective flow solution
A strong, variable
low-mass X-ray binary
X-ray binaries are a class of binary stars that are luminous in X-rays.
The X-rays are produced by matter falling from one component, called the ''donor'' (usually a relatively normal star), to the other component, called the ''accretor'', which ...
(LMXB) source and black hole
A black hole is a region of spacetime where gravitation, gravity is so strong that nothing, including light or other Electromagnetic radiation, electromagnetic waves, has enough energy to escape it. The theory of general relativity predicts t ...
candidate that flares from time to time. From spectroscopic measurements, the mass of the black-hole was found to be at least of 5.8 solar masses.
During the outbursts GX 339-4 shows evolution of quasi-periodic oscillations (QPOs). In the rising phase the QPO frequency monotonically increase as the CENBOL
In astronomy, CENBOL (derived from "CENtrifugal pressure supported BOundary Layer) is a model developed by the astrophysicist Sandip Chakrabarti and collaborators to explain the region of an accretion disk, accretion flow around a black hole.
Cent ...
propagates closer to the black hole and in the declining phase the QPO frequency monotonically decreases since the CENBOL recedes away from the black hole after viscosity is decreased. The frequency variation is thus welmodeled by the propagating and oscillating shock
in the sub-Keplerian flow. The entire spectrum also fits very well usin
two component advective flow solution
A strong, variable
relativistic jet
An astrophysical jet is an astronomical phenomenon where outflows of ionised matter are emitted as an extended beam along the axis of rotation. When this greatly accelerated matter in the beam approaches the speed of light, astrophysical jets bec ...
, emitting from radio to infrared wavelengths was observed by several studies.
References
External links
* http://iopscience.iop.org/1538-3881/123/3/1741: Optical Observations of the black hole candidate GX 339-4 Cowely et al. * http://www.universetoday.com/89102/big-ol-black-hole-jets/: Big Ol’ Black Hole Jets X-ray binaries Ara (constellation) Arae, V821 {{Multi-star-stub