quasar - определение. Что такое quasar
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Что (кто) такое quasar - определение

ACTIVE GALACTIC NUCLEI CONTAINING A MASSIVE BLACK HOLE
Quasars; Quazar; Double Quasar; Double quasar; Iron quasar; Quasistellar object; Quasi-stellar object; Quasistellar Object; Iron Quasar; Quaser; Double-quasar; MiniQSO; Mini qso; Triple quasar; Multiply imaged quasar; Quasi-Stellar Objects; Triple quasars; Multiple quasar; Quasi-Stellar Radio Source
  • Animation shows the alignments between the spin axes of quasars and the large-scale structures that they inhabit.
  • newspaper=ESO Science Release}}</ref>
  • access-date=26 October 2016}}</ref>
  • Spectrum from quasar HE&nbsp;0940-1050 after it has travelled through [[intergalactic medium]]
  • access-date=20 November 2017}}</ref>
  • Dec]] −14° 49' 27" in Crater. Observation date: May 28, 2000. Instrument: ACIS
  • starburst]] ever seen in such a combination.
  • newspaper=ESO Press Release}}</ref>
  • newspaper=ESA/Hubble Press Release}}</ref>
  • Hubble]] images of quasar [[3C 273]]. At right, a [[coronagraph]] is used to block the quasar's light, making it easier to detect the surrounding host galaxy.
  • access-date=19 June 2015}}</ref>
  • [[Sloan Digital Sky Survey]] image of quasar [[3C 273]], illustrating the object's star-like appearance. The quasar's jet can be seen extending downward and to the right from the quasar.
  • A cosmic mirage known as the [[Einstein Cross]]. Four apparent images are actually from the same quasar.

quasar         
['kwe?z?:, -s?:]
¦ noun Astronomy a massive and extremely remote celestial object which emits large amounts of energy and typically shows a starlike image.
Origin
1960s: contr. of quasi-stellar.
quasar         
(quasars)
A quasar is an object far away in space that produces bright light and radio waves.
N-COUNT
Quasar         
A quasar ( ; also known as a quasi-stellar object, abbreviated QSO) is an extremely luminous active galactic nucleus (AGN), powered by a supermassive black hole, with mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc. Gas in the disc falling towards the black hole heats up because of friction and releases energy in the form of electromagnetic radiation.

Википедия

Quasar

A quasar is an extremely luminous active galactic nucleus (AGN). It is pronounced KWAY-zar, and sometimes known as a quasi-stellar object, abbreviated QSO. This emission from an AGN is powered by a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc. Gas in the disc falling towards the black hole heats up because of friction and releases energy in the form of electromagnetic radiation. The radiant energy of quasars is enormous; the most powerful quasars have luminosities thousands of times greater than that of a galaxy such as the Milky Way. Usually, quasars are categorized as a subclass of the more general category of AGN. The redshifts of quasars are of cosmological origin.

The term quasar originated as a contraction of "quasi-stellar [star-like] radio source"—because quasars were first identified during the 1950s as sources of radio-wave emission of unknown physical origin—and when identified in photographic images at visible wavelengths, they resembled faint, star-like points of light. High-resolution images of quasars, particularly from the Hubble Space Telescope, have demonstrated that quasars occur in the centers of galaxies, and that some host galaxies are strongly interacting or merging galaxies. As with other categories of AGN, the observed properties of a quasar depend on many factors, including the mass of the black hole, the rate of gas accretion, the orientation of the accretion disc relative to the observer, the presence or absence of a jet, and the degree of obscuration by gas and dust within the host galaxy.

More than a million quasars have been found, with the nearest known being about 600 million light-years away from Earth. The record for the most distant known quasar continues to change. In 2017, the quasar ULAS J1342+0928 was detected at redshift z = 7.54. Light observed from this 800-million-solar-mass quasar was emitted when the universe was only 690 million years old. In 2020, the quasar Pōniuāʻena was detected from a time only 700 million years after the Big Bang, and with an estimated mass of 1.5 billion times the mass of the Sun. In early 2021, the quasar J0313–1806, with a 1.6-billion-solar-mass black hole, was reported at z = 7.64, 670 million years after the Big Bang.

Quasar discovery surveys have demonstrated that quasar activity was more common in the distant past; the peak epoch was approximately 10 billion years ago. Concentrations of multiple, gravitationally attracted quasars are known as large quasar groups and constitute some of the largest known structures in the universe.

Примеры употребления для quasar
1. Only one quasar has been discovered at a greater distance.
2. An illustration shows dusty grains blowing in the winds of a quasar, or active black hole.
3. The most distant quasar known is at a redshift of 6.4.
4. Gas molecules collide in the searing heat of the quasar, which is thousands of degrees Fahrenheit, and form clusters.
5. Astronomers used the telescope to break down the wavelengths of light in the quasar to figure out what was in the space dust.