microquasar

(redirected from Microquasars)

microquasar

[¦mī·krō ′kwā‚zär]
(astronomy)
An object in the Milky Way Galaxy that contains a black hole or neutron star and emits jets of material that exhibit superluminal motion and resemble those emitted from quasars.
References in periodicals archive ?
By studying microquasars such as MQ1, we get a glimpse of how the early universe evolved, how fast quasars grew and how much energy black holes provided to their environment.
The combination of its superior location and experimental capabilities led to a long list of exciting discoveries of several very high energy (VHE) gamma ray sources over the past few years, including supernova remnants, the source at the Galactic Centre, compact binary systems, microquasars, pulsar wind nebulae, gamma rays from cosmic-ray interactions with dense molecular clouds, a starburst galaxy, stellar and galaxy clusters, active galactic nuclei, and "dark sources" with no obvious counterparts, in addition to conducting the first VHE survey of the sky, measuring the local cosmic-ray electron and iron nuclei spectra, constraining the level of extragalactic background light, and providing upper limits to dark mater annihilation.
This object, also known as a microquasar, blows a huge bubble of hot gas, 1000 light-years across, twice as large and tens of times more powerful than other known microquasars.
Very powerful jets have been seen from supermassive black holes, but are thought to be less frequent in the smaller microquasar variety.
Because the emissions from microquasars vary on time scales of days to weeks, rather than decades like quasar emissions, systems such as Cygnus X-3 "are the test bed of choice" for probing quasar activity, he says.
Two teams have now made the first definitive detection of high-energy gamma rays from this system, a microquasar known as Cygnus X-3.
Other topics include microquasars, massive star formation, red giant stars, geodesy, and new equipment and techniques.
Papers are presented in sections on compact binaries in globular clusters, millisecond binary pulsars, supernovae from massive binary systems and GRBs, accretion on black holes and microquasars, accretion on white dwarfs and novae, rapid variability and secular evolution of LMX-Ray binaries, and secular evolution of high-mass x-ray binaries.
Each of the 3,000 entries gives current information about a topic such as comets, asteroids, meteorites, moons, planets, constellations, nebulae, galaxies, microquasars, brown dwarfs, and dark energy but also tells a bit of the history of astronomy.
Washington, November 27 (ANI): NASA's Fermi Gamma-ray Space Telescope has made the first unambiguous detection of high-energy gamma-rays from an enigmatic microquasar.
The microquasar is a binary system known as Cygnus X-3.