Jets
Jets are collimated beams of matter ejected from some astronomical objects like water from a hose. They occur in a number of astrophysical situations, but can be broadly divided into two main types: ...
Definition: jets: Beams of particles, usually coming from an active galactic nucleus or a pulsar. Unlike a jet airplane, when the stream of gas is in one direction, astrophysical jets come in pairs with each jet aiming in opposite directions.
Jets, Superluminal Motion, and Gamma-Ray Bursts
Radio synthesis maps have shown jets in hundreds of AGN, on scales from subparsec to megaparsecs.
Jets of particles are already known to be associated with black holes, neutron stars that are feeding off companion stars, and young stars that are still growing.
Accretion disks around a variety of objects seem to be able to produce jets (protostars certainly do, in addition to accreting black holes). It is just that the ones from an accreting black hole tend to be the fastest and the most spectacular.
Jets
A gas jet, fluid jet, or hydro jet is a nozzle
Nozzle ...
Jets: A pair of beams of particles, usually coming from an active galactic nucleus or a pulsar.
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JETS
Jets are blasts of particles that are emitted by an active galactic nucleus or a pulsar. Jets only occur in pairs, going in opposite directions.
[edit] Jets
As accreted matter falls toward the compact object, it loses gravitational potential energy.
Jumbled Jets
Can you put the airplanes in the correct order for takeoff?
STELLAR JETS - Linear streams of matter arising from a number of different sources (T Tauri stars, planetary nebulae, and compact objects). Stellar jets from T Tauri stars are common in star forming regions.
Jets of this sort are apparently quite common in astronomical systems in which an accretion disk surrounds a compact object (such as a neutron star or a black hole).
Jets on comet Borrelly
This very long exposure was taken by NASA's Deep Space 1 to show detailed structures in the faint parts of comet Borrelly's inner coma. As a result, the nucleus has been greatly over-exposed and its shape appears distorted.
Jets
Narrow, high-energy streams of gas and other particles generally ejected in two opposite directions from some central source.
Jets form in Kerr black holes that have an accretion disk. The matter is funneled into a disk-shaped torus by the hole's spin and magnetic fields, but in the very narrow regions over the black hole's poles, ...
Jets up to 16,000 kilometers in diameter, in the Sun's atmosphere.
Stratosphere
Level of the Earths atmosphere from about 11-64 kilometers above sea level.
Jets, Radio: Narrow, collimated beams of plasma that are producing radio (synchrotron) emission. These jets emerge from the cores of radio galaxies and can extend outward across regions of space larger than the size of the galaxy itself.
The jets are the result of some really twisted physics, according to a new computer model. And to unravel the mystery, a researcher invokes some imaginary string, a corkscrew and a certain child's plaything - the Slinky.
Some jets are associated to binary systems. A good example is the pulsar in the Crab Nebula (M1) In that case the fundamental mechanism of forming and accelerating of these jets is to be linked to what is supposed to be with the solar wind and the ...
These jets would explain several puzzling features along the periphery of the gas lobes.
Giant jets of superfast particles are powered by supermassive black holes at the cores of galaxies. Both elliptical and spiral galaxies harbor such black holes, but only Speca and one other spiral galaxy have been seen to produce large jets.
Three jets that spew molecules from the comet's surface when it becomes heated up by the sun form the most visible part of the tail.
More than 30 "jets" of liquid water spray into space from the region around the south pole of Enceladus, a moon of Saturn, in this recent image from the Cassini spacecraft.
radio jets (astronomy) (NASA Thesaurus) Jets of energetic particles occurring in radio galaxies and quasars usually emitted from the nuclear (active) region of the extragalactic radio source.
GRB Jets: collimated emission
Narrow jet emissions are widely believed to be the case, as of 2007.
Dassault Combat Jets:
The Dassault Ouragan, Mystere, & Super Mystere
The Dassault Mirage III/5/50 Series
The Dassault Mirage IV
The Dassault Etendard & Super Etendard
The Dassault Mirage F1 ...
Opposite directed jets of gas ejected by some protostellar objects.
BL Lac Object
Objects resemble quasars; thought to highly luminous cores of distant galaxies.
The shock wave and jets of neutrinos continue to propel the material away from the dying star, off into interstellar space.
A jet engine, as, an airplane with jets slung in pods. jetavator A control surface that may be moved into or against a rocket's jetstream, used to change the direction of the jet flow for thrust vector control. Compare jet vane. jet engine 1.
Using the radio astronomical very long baseline interferometry (VLBI) technique, by the end of the 1970s three QSRs and one Seyfert type 1 galaxy had been found to display superluminal velocities in their nuclear radio jets.
Large sunward jets of dust originate from the vents; they are clearly dragged away by the gases vaporizing from the nucleus. This vaporization has to be a sublimation of the ices that cools them down to no more than 200 K in the open vents.
after the tenuous gas of the Solar nebula began collapsing into the proto-Sun within its host molecular cloud, a strong magnetic field developed that was instrumental in transporting rotational energy away from its core region in bi-polar jets of gas ...
The high energy accretion disk can cause the formation of jets perpendicular to the disk. This is due to the strong magnetic field that arises from the hot material in the disk.
It was found that many such sources possess radio jets that point from the nuclei of the parent galaxies to the radio lobes.
The disks, made of gas and dust, that we see around many newly born stars also soon disappear; partly in jets of material that stretch up to a light year above and below the disk and partly into planets, ...
Radio-loud AGN always produce jets in which the material may be flowing at close to the speed of light.
The original model was later withdrawn because of structural faults, but by 1958 the French Caravelle and the larger Boeing 707 jets enter service. Gradually jets begin dominating air transport, while travel by ocean liners declines sharply.
The bright white jets on the left side of the nucleus are pointed in the direction of the Sun.
Images from the spacecraft's camera revealed the comet nucleus to be a dark peanut-shaped body with two bright jets spewing material out. Passing by the comet at a velocity of 68 km/second, the spacecraft suffered some damage.
Pulsars are spinning neutron stars that have jets of particles moving almost at the speed of light streaming out their two magnetic poles . These jets produce very powerful beams of light .
His only guideline was Gene Roddenberry's firm list of what he did not want to see: any rockets, jets, or fire-streams.
It is widely speculated that these jets or beams transport energy away from the galactic nucleus to the radio-emitting plasma and that the source of energy lies in a massive object, possibly a black hole located at the galactic center.
As Comet Hyakutake approached the Sun, jets of dust erupted from the Sun-facing side of its nucleus. Paul Boltwood took this unusually close-in image of the inner coma of the comet using a 7-inch refractor and a homemade CCD camera.
Black Holes also form jets of matter that shoot out from the center of the galaxy. These jets can shoot out for Millions of Light-Years. Quasars are special Active Galactic Nuclei that have their jets lined up with our line of sight.
Models of protostar also show that they will have accretion disks and jets. The jets are not long-lived and last only about 100,000 years.
It reappeared in 1835 when it was carefully recorded by visual observers, and in 1910, when its long tail and outbursts of dust jets were observed photographically.
The comet has gaseous jets, probably from fissures or vents in the comet's surface where ice could be vaporizing and rushing off of the tiny body into space. That vapor leaving the nucleus would become part of the comet's tail.
Besides being brilliant, active galactic nuclei can drive jets of material far into extragalactic space. These jets of matter, which move at close to the speed of light, are seen through the radio waves they radiate.
Short-lived (lifetime from rising to falling is about 15 minutes) jets vertical to the solar surface that are several thousand kilometers long and about 1 kilometer thick.
Solar plumes Long, feathery jets that expel a high-speed stream of electrified gas from the corona. They extend from near the solar poles to more than 13 million miles into space.
More about solar plumes...
The right figure shows a more recent image with at least five jets emanating from the nucleus. (Here is an enhanced photograph of at least 7 jets from Hale-Bopp taken at the European Southern Observatory.) ...
blazars a class of active galaxies that exhibit rapidly variable emission from the radio through gamma-ray band. The radiation is predominantly from jets moving near the speed of light.
bipolar flow: Oppositely directed jets of gas ejected by some protostellar objects.
birth line: In the H-R diagram, the line above the main sequence where protostars first become visible.
The fan-shaped set of streamers extending toward the sun from the coma is composed of dust jets being blown off the comet's nucleus by the sublimation of its ices.
Sentman, D. D. and Wescott, E. M. "Red Sprites and Blue Jets: High-Altitude Optical Emissions Linked to Lightning." EOS, Trans. Amer. Geophys. Union 77, 1-4, 1996.
HH 32, about 1,000 light-years from Earth, is an excellent example of a "Herbig-Haro object," which is formed when young stars eject jets of material back into interstellar space.
As stars condense gravitationally from their cold cloudy birthplaces, some of the infalling matter spins out into a disk, from which emerge opposing jets.
A composite image from the Stardust spacecraft shows dust and gas jets erupting off the nucleus of comet Wild 2.
BLAZAR
A blazar is a type of extreme . These extremely energetic objects emit jets of gamma rays and other electromagnetic radiation.
Two lobes of radio emission are fed by jets of energetic particles from the galaxy core. (I thank Philip Blanco for this description. Philip has a web page devoted to Cygnus A. Those interested just set their search engine to 'Cygnus A'.) ...
 See also: Light, Earth, Energy, Time, Sun
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