Quasar
Related Category: Astronomy: General
(kw´sär), one of a class of blue celestial objects having the appearance of stars when viewed through a telescope and currently believed to be the most distant and most luminous objects in the ...
Quasars, Redshifts and Controversies
Quasars, Redshifts and Controversies is a 1987 book by Halton Arp, an astronomer famous for his work on anomalous redshifts.
Quasar
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The quasar-like Murasaki 312 in 2267 A Quasar is a specific type of astronomical object formed by matter falling into a super-massive black hole. The resulting energy is released as X-rays in all directions.
Quasar
With the exception of the short-lived, powerful explosions responsible for supernovae and gamma-ray bursts, quasars (or QSOs) are the brightest objects in the Universe.
quasar
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Quasar
A radio-loud . Infrared observations reveal quasars to be associated with active host galaxies (McLeod and Rieke 1994, 1995), despite initial claims by J.
Quasars were first detected as unresolved sources in surveys conducted during the 1950s by radio astronomers in Cambridge, Eng.
Quasar Host Galaxies
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Hubble Space Telescope image courtesy of STScI
Quasars, or quasi stellar objects, are so named because they are point-like objects just like stars.
A quasar is a high energy object in the center of a galaxy that typically emits a gamma ray signature that is greater than the rest of the galaxy. They are the counterpart of blazars.
Definition: quasar: An enormously bright object at the edge of our universe which emits massive amounts of energy. In an optical telescope, they appear point-like, similar to stars, from which they derive their name (quasar = quasi-stellar).
I am encountering an increasing number of individuals who claim that large red-shifts do not occur in the spectra of quasars (though a few maintain that small red-shifts (z galaxies with higher redshifts are fainter and subtend smaller angular sizes ...
Quasar
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A quasar (contraction of QUASi-stellAR radio source) is an extremely bright and distant active galactic nucleus.
Quasars
Wow!
Quasars give off more energy than 100 normal galaxies combined.
Quasars are the most luminous objects known in the Universe, and reside in the centre of so-called active galaxies.
Quasars
One of the most remarkable trends in gamma-ray astronomy in recent years has been the emergence of high-energy gamma-ray quasars as an important component of the gamma-ray sky.
quasars turning on in a finite time
dust envelopes around quasars dispersing
galaxies forming
an effect of opacity in the IGM or intervening galaxies ...
QUASAR
QUASAR, acronym for quasi-stellar radio source, any of the blue, starlike objects that are strong radio emitters and the spectra of which exhibit a strong red shift.
Quasars
Quasars comprise the most luminous subclass of AGNs, with nuclear magnitudes MB h0. A small minority (5-10%) of these sources are the strong radio sources that originally defined the quasar class.
Quasar Animation
The following year saw a breakthrough, when astronomers realized that the strongest unknown lines in 3C 273's spectrum were simply familiar spectral lines of hydrogen redshifted by a very unfamiliar amount"about 16 percent! ...
Quasars as Probes of the Distant Universe
Absorption of their light by intervening objects ...
quasar
the highly energetic core of a young galaxy thought to be powered by a supermassive black hole; short for quasi-stellar object
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Quasar
(a) The brightest objects in the Universe, quasars can generate over a trillion times as much light as the Sun from a region little larger than the Solar System. Most are extremely distant, which means that they existed long ago.
Quasar: Objects of small angular size and immense power output. Some quasars (quasi-stellar objects, or QSOs) are strong radio sources. Radio-emitting quasars were the first to be discovered.
Quasar- the brilliant core of a distant young active galaxy with outer regions that are often too faint to be visible
Quark- a (charged) elementary particle that feels the strong force; protons and neutrons are composed of three quarks each ...
Quasars - Even the brightest star, at a luminosity of 40 million suns, it is still not the brightest object in the universe. This honor belongs to the Quasars, of which several hundred are currently known.
quasar
An incredibly luminous object in the distant universe which releases an enormous amount of energy. Because of their immense distances, quasars appear as star-like points of light in the largest telescopes, and they are not fully understood.
Quasar -- Quasi-stellar object observed mainly in radio waves. Quasars are extragalactic objects believed to be the very distant centers of active galaxies.
RA -- Right Ascension.
Quasar
Small powerful source of energy believed to be the active core of very distant galaxies.
Quasi-Periodic Object (QPO) ...
Quasar
An unusually bright object found in the remote areas of the universe. Quasars release incredible amounts of energy and are among the oldest and farthest objects in the known universe. They may be the nuclei of ancient, active galaxies.
R ...
Quasar. A very remote, highly luminous body. They are now known to be the cores of very energetic galaxies although precisely what makes them so luminous is uncertain.
R ...
Quasar - A distant galaxy, seen as it was in the remote past, with a very small, luminous nucleus ...
Quasar, Quasar, Burning Bright is the thirteenth collection of essays by Isaac Asimov reprinted from The Magazine of Fantasy & Science Fiction....
(1977)
Road to Infinity (1979)
The Sun Shines Bright ...
quasar short for ``quasi-stellar radio source''. Quasars are the most luminous of active galaxies---they are the extremely active nuclei of otherwise normal galaxies. Quasars generate a huge amount of energy within very tiny volumes.
Quasar Spectra
Quasars exhibit very bright emission features relative to a low intensity continuum in their spectra. Indeed it was only through careful analysis of the spectra of quasars that astronomers realised they were not just faint stars.
Quasars
Quasars were originally thought to be stars with very strange spectra. If you look at a quasar you usually see a point of light - just like what you see when you look at a normal star in our galaxy.
3C273 Quasar in Virgo
(RA 12h 29.1m , Dec. +2°03', variable / 13 mag.) ...
[edit] Quasars
In the 1950s, some strong radio sources were found to be associated with very dim objects that seemed to be very blue. These were named Quasi-stellar radio sources, or quasars.
Quasar
The brightest type of active galactic nucleus, believed to be powered by a supermassive black hole. The word "quasar" is derived from quasi-stellar radio source, because this type of object was first identified as a kind of radio source.
QUASAR
A quasar (more recently known as a QSO, Quasi-Stellar Object) is a distant star-sized energy source in space with excess of ultraviolet.
Quasars
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quasars Originally, a distant, highly luminous object that looks like a star. Strong evidence now exists that a quasar is produced by gas falling into a supermassive black hole in the center of a galaxy. [More Info: Field Guide] ...
Quasar
Quasi-stellar Radio Source - A very luminous but distant galaxy, formed very early on in the history of the Universe.
quasar
Short for 'quasi-stellar object'; mysterious distant objects in the universe, which are powerful sources of radio waves and light
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Quasars are perhaps the most luminous object known; some (including 3 C 273) are known to have absolute magnitudes as great as -27.
Burnham (p. 2101) gives an identification chart, as well as a detailed discussion on the phenomenon of quasars.
Quasars are predicted to only be possible in the early stages of a dynamic cosmos by the Big Bang theory, and observational evidence supports this, as quasar populations become denser the further away one looks. (more needed)
Olbers' Paradox ...
Quasar: From quasi-stellar object, a star-like (i.e. unresolved) object that has a very large luminosity and is located at very large distances from us (as indicated by their high cosmological redshifts).
A quasar (more recently known as a QSO, ) is a distant star-sized energy source in space with an excess of ultraviolet radiation. Some of these QSO's gives off large amounts of radiation, including radio waves and X-rays (but some are radio-quiet).
[8.4] QUASARS
[9.0] Cosmology & The Big Bang
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Distance to quasars ( Here is one of the most famous quasars, 3C273. Courtesy NOAO/NSF.)
1024
Size of a typical cluster of galaxies ( One example of galaxy cluster, near 3C324. Courtesy STScI.) ...
Quasar SDSS
J1030+0524
Early Galaxies
Note: These objects tend to be extremely distant from Sol, in space and even time. Many are also extremely large, massive, dense, energetic, ancient, or young.
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RADIO STAR
Quasars were called "radio stars" in the early 1960's when they were first detected, because they emit large amounts of radiation, including radio waves.
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AGN are found at the heart of active galaxies, including quasars, Seyfert galaxies, blazars, and radio galaxies. In addition to their great energy output, they can be highly variable.
The most powerful active galaxies are quasars. They are among the brightest and most distant objects in the universe. A quasar may emit more energy than an entire galaxy of stars from a region no bigger than our own solar system.
For many years there was only indirect evidence of supermassive black holes: the existence of quasars.
Young objects such as quasars were only observed at the very edges of the universe, indicating that such objects only existed in times long past, whereas the Steady State predicted that young galaxies should be scattered all over the universe, ...
QSO - Quasi Stellar Object, also Quasar: QSOs are objects that, at first glance, appear as normal stars. Upon closer inspection, however, QSOs have very large redshifts (i.e.
Quasars and other active galaxies were also found to be strong infrared emitters. All of this new information came from near-infrared observations which could be made from the ground.
Thirdly, quasars, particularly the Lensed Quasar in Ursa Major near NGC3079. Then, planetary nebulae. They come in an endless variety. Finally, globulars. M15 is my favorite, particularly as one of its zillion stars has burst into tiny 15th mag.
An example was the early belief that all quasars are radio sources, when the principal method used to discover quasars was to look for radio sources and then to find out whether they had other properties associated with quasars.
 See also: Quasars, Galaxies, Light, Universe, Galaxy
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