|
List Of Microquasars ...
This is a list of all known microquasars: 1 * 1E 1740,7-2942 4 * 4U1630-47 C *Cygnus X-1 * Cygnus X-3 (V1521) * CI Cam G *GRS 1915+105 *GRO J1655-40 * GX339-4 K * KS1731-260 L *LS I +61 303 * LS 5039 S *Scorpius X-1 *SS 433 V * V4641 Sgr * V691 CrA X * XMMU J004243.6+412519 * XTE J1118+480 * XTE J1550-564 See also * List of quasars References {{black holes * microquasars A microquasar, the smaller version of a quasar, is a compact region surrounding a stellar black hole with a mass several times that of its companion star. The matter being pulled from the companion star forms an accretion disk around the blac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microquasar
A microquasar, the smaller version of a quasar, is a compact region surrounding a stellar black hole with a mass several times that of its companion star. The matter being pulled from the companion star forms an accretion disk around the black hole. This accretion disk may become so hot, due to friction, that it begins to emit X-rays. The disk also projects narrow streams or " jets" of subatomic particles at near-light speed, generating a strong radio wave emission. Overview In 1979, SS 433 became the first microquasar to be discovered. It was thought to be the most exotic case until similar objects such as GRS 1915+105 were discovered in 1994. In some cases, blobs or "knots" of brighter plasma within the jets appear to be traveling faster than the speed of light, an optical illusion called superluminal motion which is caused by sub-light-speed particles being projected at a small angle relative to the observer. The 1996 Bruno Rossi Prize of the American Astronomical Society wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LS 5039
LS 5039 is a binary system in the constellation of Scutum. It has an apparent magnitude of 11.27, and it is about 8,200 light-years away. LS 5039 consists of a massive O-type main-sequence star, and a compact object (likely a black hole) that emits HE (high energy) and VHE ( very high energy) gamma rays. It is one of the only three known star systems of this kind, together with LS I +61 303 and PSR B1259-63. The two objects orbit each other every 3.9 days, along a moderately eccentric orbit. Additionally, it is one of the few massive X-ray binaries known to be associated with radio emission. References External linksDiscovery of Very High Energy Gamma Rays Associated with an X-ray Binary(Science Express) July 7, 2005(ScienceDaily) May 19, 2006 See also *LS I +61 303 LS I +61 303 is a microquasar, a binary system containing a massive star and a compact object. The compact object is a pulsar and the system is around 7,000 light-years away. Discovery LS I + ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Quasars
This article contains lists of quasars. More than a million quasars have been observed, so any list on Wikipedia is necessarily a selection of them. Proper naming of quasars are by Catalogue Entry, Qxxxx±yy using B1950 coordinates, or QSO Jxxxx±yyyy using J2000 coordinates. They may also use the prefix QSR. There are currently no quasars that are visible to the naked eye. List of quasars This is a list of exceptional quasars for characteristics otherwise not separately listed List of named quasars This is a list of quasars, with a common name, instead of a designation from a survey, catalogue or list. List of multiply imaged quasars This is a list of quasars that as a result of gravitational lensing appear as multiple images on Earth. List of visual quasar associations This is a list of double quasars, triple quasars, and the like, where quasars are close together in line-of-sight, but not physically related. List of physical quasar groups This is a list of b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
XTE J1118+480
XTE J1118+480 is a low-mass X-ray binary in the constellation Ursa Major. It is a soft X-ray transient that most likely contains a black hole and is probably a microquasar. Discovery XTE J1118+480 was discovered using the All-Sky Monitor on the Rossi X-Ray Timing Explorer satellite after it detected an outburst from the system on March 29, 2000. XTE is the standard designation for objects discovered by this satellite. It is also catalogued as 2MASS J11181079+4802126 in the Two-Micron All Sky Survey catalogue of infrared objects, and has been given the variable star designation KV Ursae Majoris. April–June outburst Much of what is known about XTE J1118+480 comes from data collected during the outburst in March 2000. The Rossi X-Ray Timing Explorer and the Advanced Research and Global Observation Satellite observed a quasi-periodic oscillation (QPO) from XTE J1118+480 as it evolved. The QPO is comparable to QPOs of other black-hole candidates. Properties The compact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V691 CrA
X1822–371, associated with the optically visible star V691 Coronae Australis (abbreviated V691 CrA), is a neutron-star X-ray binary system at a distance of approximately 2-2.5 kiloparsecs. It is known to have a high inclination of i = 82.5°± 1.5°. This source displays relatively high brightness in the optical wavelengths when compared to the X-ray, making it a prototypical Accretion Disk Coronae (ADC) source, i.e. a source with a corona extending above and below its accretion disk. The only-partial eclipses in its light curve, even at such a high inclination, support this hypothesis. Estimates of the mass of its neutron star lies between 1.14–2.32 solar masses. The optical spectrum of X1822–371 displays strong Hα, Hβ, He I, He II and Bowen Blend features. These features have been extensively studied using the technique of Doppler tomography An inverse problem in science is the process of calculating from a set of observations the causal factors that produce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V4641 Sgr
V4641 Sagittarii is a variable X-ray binary star system in the constellation Sagittarius (constellation), Sagittarius. It is the source of one of the fastest superluminal jets in the Milky Way galaxy. In 1999 a violent X-ray outburst revealed it to contain a black hole. At the time, it was considered to be the closest known black hole to Earth, at a distance of approximately . Later observations showed it to be much farther away, reported in 2001 to be between 7.4 and , in 2014, and around according to its Gaia Data Release 2 parallax. The star in the binary system is a late B class giant star, giant with a mass about three times that of the Sun. It orbits a black hole about twice as massive every 2.8 days. The star is distorted, which causes variations in its brightness as it orbits and rotates. It is also slightly eclipsed by an accretion disc around the black hole. The system usually does not produce a significant amount of x-rays, but undergoes outbursts when th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SS 433
SS 433 is one of the most exotic star systems observed. It is located in the Milky Way galaxy, and is an eclipsing X-ray binary system, with the primary being a stellar-mass black hole. The spectrum of the secondary companion star suggests that it is a late A-type star. SS 433 is the first discovered microquasar. It is at the centre of the supernova remnant W50. SS 433's designation comes from the initials of two astronomers at Case Western Reserve University: Nicholas Sanduleak and Charles Bruce Stephenson. It was the 433rd entry in their 1977 catalog of stars with strong emission lines.SS 433 David Darling, entry in ''The Internet Encyclopedia of Science'', accessed on line September 14, 2007. Its emission lines were studied by |
Scorpius X-1
Scorpius X-1 is an X-ray source located roughly 9000 light years away in the constellation Scorpius. Scorpius X-1 was the first extrasolar X-ray source discovered, and, aside from the Sun, it is the strongest apparent source of X-rays in the sky. The X-ray flux varies day-to-day, and is associated with an optically visible star, V818 Scorpii, that has an apparent magnitude which fluctuates between 12-13. Discovery and early study The possible existence of cosmic soft X-rays was first proposed by Bruno Rossi, MIT Professor and Board Chairman of American Science and Engineering in Cambridge, Massachusetts to Martin Annis, President of AS&E. Following his urging, the company obtained a contract from the United States Air Force to explore the lunar surface prior to the launch of astronauts to the Moon, and incidentally to perhaps see galactic sources of X-rays. Subsequently, Scorpius X-1 was discovered in 1962 by a team, under Riccardo Giacconi, who launched an Aerobee 150 sounding r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LS I +61 303
LS I +61 303 is a microquasar, a binary system containing a massive star and a compact object. The compact object is a pulsar and the system is around 7,000 light-years away. Discovery LS I +61 303 is an 11th-magnitude star that was recognised as a luminous object and catalogued as an OB star in 1959. It was included in the Hipparcos survey as HIP 12469 and had its parallax measured at milliarcseconds (mas), revised to − mas in the new reduction. The first ''Gaia'' data release gave a parallax of mas. The galactic radio source GT 0236+610 was found at the same position as LS I +61 303. A gamma-ray source 2CG 135+01 was found within a degree of its position, and the MAGIC telescope confirmed that LS I +61 303 was the source of the gamma rays. Periodic X-ray outbursts also occur. Binary system LS I +61 303 shows the spectrum of a Be star, a B0 main sequence star with disk that produces emission lines in its spectrum. Variations in its radial velocity show that it is i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1E 1740,7-2942
1E is a Privately held company, privately owned Information Technology, IT software and services company based in the United Kingdom. 1E is headquartered in London, with offices in New York City, Dublin, and Noida. History 1E was founded in 1997 by three former Microsoft contractors, Sumir Karayi, Phil Wilcock, and Mark Blackburn, who each contributed £500 to start the company. Karayi is now the CEO, Blackburn is the CIO, whilst Wilcock has left the company. The company has more than 30 million licenses deployed worldwide, across 1,700 organizations from public and private sectors in 42 countries.[citation needed'] The company's name is derived from a computer error. When some Microsoft Windows computers crash, a blue screen containing "STOP 0x0000001E" appears. This name was chosen because the founders had the ambition that 1E could prevent this from happening to big companies. Research In 2009 1E and the Alliance to Save Energy commissioned independent research into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
