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The gamma-ray and X-ray source GRS 1124-683, discovered by the
It is one of several likely black hole systems that are classified as X-ray novae. Such a nova periodically produces bright outbursts of X-rays, along with visible light and other forms of energy.
In such a system, a black hole pulls gas from the surface of a companion star. The gas forms a thin disk around the black hole, known as an accretion disk. In an X-ray nova, the flow of gas is fairly thin and slow, so the accretion disk remains relatively cool, and little gas falls into the black hole.
In the case of GU Muscae, the black hole is about seven times as massive as the Sun, while the companion is three-quarters as massive as the Sun. The companion is also cooler than the Sun, so its surface is redder, and the star's total luminosity is only one-third that of the Sun's. Its outer layers probably were blown away by the supernova explosion that gave birth to the black hole. The two stars orbit each other every 10.4 hours at a distance of roughly 2 million miles (3.2 million km).
Harvard website written by Orosz, Jerome A.; Bailyn, Charles D.; McClintock, Jeffrey E.; Remillard, Ronald A.
{{DEFAULTSORT:GRS 1124-683 X-ray astronomy Astronomical X-ray sources Stellar black holes Muscae, GU Musca (constellation) K-type main-sequence stars
Granat
The International Astrophysical Observatory "GRANAT" (usually known as Granat; russian: Гранат, lit. ''pomegranate''), was a Soviet (later Russian) space observatory developed in collaboration with France, Denmark and Bulgaria. It was launc ...
mission and Ginga Ginga may refer to:
Japanese Other
* "Ginga" (single), a 2005 single from Japanese rock band Fujifabric
* Yokosuka P1Y ''Ginga'', a Japanese bomber aircraft
TV
* Ginga (middleware), a Japanese-Brazilian digital TV middleware
Series
* Ginga N ...
, is a system containing a 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. The system also goes by the name X-ray Nova Muscae 1991 or GU Muscae. These two orbiting X-ray telescopes discovered the system when the system produced an outburst of X-rays on January 9, 1991.
Black hole system
It is one of several likely black hole systems that are classified as X-ray novae. Such a nova periodically produces bright outbursts of X-rays, along with visible light and other forms of energy.
In such a system, a black hole pulls gas from the surface of a companion star. The gas forms a thin disk around the black hole, known as an accretion disk. In an X-ray nova, the flow of gas is fairly thin and slow, so the accretion disk remains relatively cool, and little gas falls into the black hole.
In the case of GU Muscae, the black hole is about seven times as massive as the Sun, while the companion is three-quarters as massive as the Sun. The companion is also cooler than the Sun, so its surface is redder, and the star's total luminosity is only one-third that of the Sun's. Its outer layers probably were blown away by the supernova explosion that gave birth to the black hole. The two stars orbit each other every 10.4 hours at a distance of roughly 2 million miles (3.2 million km).
Spectral radiance
During the January 20–21, 1991, outburst which led to its discovery, radiation was produced by positron annihilation. The SIGMA telescope aboardGRANAT
The International Astrophysical Observatory "GRANAT" (usually known as Granat; russian: Гранат, lit. ''pomegranate''), was a Soviet (later Russian) space observatory developed in collaboration with France, Denmark and Bulgaria. It was launc ...
detected a relatively narrow variable emission line near 500 keV in the spectrum. From January 9-August 14, 1991, the spectrum had a strong hard component extending up to ~300 keV.
References
Harvard website written by Orosz, Jerome A.; Bailyn, Charles D.; McClintock, Jeffrey E.; Remillard, Ronald A.
{{DEFAULTSORT:GRS 1124-683 X-ray astronomy Astronomical X-ray sources Stellar black holes Muscae, GU Musca (constellation) K-type main-sequence stars