Sentences with phrase «galactic nuclei»

They are proposed to be the primary cause of active galactic nuclei found at the core of some galaxies.

Originally, Shaya and colleagues were looking for active galactic nuclei in their Kepler data.

There have been a number of mechanisms proposed for quenching, for example «feedback» from supernovae or active galactic nuclei which breaks up the star forming clouds and reduces the star formation rate, but the measurement and verification of yet other possible processes is of great importance.

If gas falls into the object, it can heat up and glow, turning the region just outside the black hole into a quasar — a brilliant galactic nucleus that can outshine the entire Milky Way.

M81's active galactic nucleus contains a supermassive black hole with about 70 million solar masses, or 15 times the mass of the black hole in the Milky Way Galaxy, and has been an object of extensive study.

A far - flung space telescope is peering into galactic nuclei to spot one for the first time

The observations, reported online September 27 in Science, may help explain how some active galactic nuclei launch powerful plasma jets thousands of light - years into space.

He thinks Williams» active galactic nucleus explanation could be right.

«In our model, cosmic rays accelerated by powerful jets of active galactic nuclei escape through the radio lobes that are often found at the end of the jets,» Fang said.

Quasar An active galactic nucleus derives its high energy from gas accreting on the center of a supermassive black hole.

«The active galactic nuclei seemed to make sense, but now it's a lot more up in the air,» says New York University physicist Glennys Farrar, who works with researchers at the Auger Observatory.

The source itself might also be varying as the active galactic nucleus periodically gulps a little more matter and flares in brightness.

However, new research suggests that two of the most common types of active galactic nuclei do, in fact, exhibit fundamental physical differences in the way they consume matter and spit out energy.

«A detailed picture of the physical processes that influence this extraordinary region is key to understanding all other galactic nuclei in the universe,» Andreas Eckart of the University of Cologne in Germany writes in an accompanying commentary.

Nobody is sure, but attention will now shift to active galactic nuclei powered by supermassive black holes.

Science Interests Formation of galaxies and black holes in the early universe and their growth over cosmic time; large surveys with Hubble and other telescopes to discover new populations of distant galaxies and black holes; physical properties of active galactic nuclei using observations from radio, infrared, optical, ultraviolet through to X-ray energies.

Just a few days ago, the ESA released this Hubble image of a pair of barred spiral galaxies some 350 million light years away in the process of merging, their two galactic nuclei still separated by a massive distance but throwing out clouds of hot gas and mid-formation stars.

«Just as we can't see the sun on a cloudy day, we can't directly see how bright these active galactic nuclei really are because of all of the gas and dust surrounding the central engine,» Peter Boorman, a graduate student at the University of Southampton in the U. K. who led the IC 3639 study, said in the statement.

While other objects in the universe generate cosmic rays, most probably active galactic nuclei located far beyond our own Milky Way galaxy, supernovae in our own galactic neighborhood are thought to produce a large fraction of the cosmic rays that impact Earth.

IC 3639, a galaxy with an active galactic nucleus which has an obscured supermassive black hole, is seen in this image combining data from the Hubble Space Telescope and the European Southern Observatory.

There's just one problem: Astronomers have found quasarlike centers — called active galactic nuclei (AGN)-- in some relatively nearby galaxies, which should be far too old to generate such energies.

Another culprit might be active galactic nuclei (AGN), which are blazingly strong light sources powered by black holes.

Astronomers refer to this type of black - hole powered system as an active galactic nucleus (AGN).

It started taking data in 2004, and in 2007 Auger researchers announced that cosmic rays with energies above about 60 exa - electron volts (EeV) appeared to come from the fiery hearts of galaxies thought to contain supermassive black holes feeding on in - falling debris, so - called «active galactic nuclei.»

He notes that the model was originally developed for active galactic nuclei — outbursts powered by supermassive black holes — so there is no reason to think it must also apply to gamma - ray bursts.

One possibility was that they are spat out by «active galactic nuclei» (AGNs)-- energetic galaxies powered by matter swirling onto a supermassive black hole.

The galaxy probably contains what is known as an active galactic nucleus — a central region that glows brightly and variably in a number of wavelengths, including radio.

Rodrigo Contreras Ramos elaborates: «This discovery of RR Lyrae Stars in the centre of the Milky Way has important implications for the formation of galactic nuclei.

The leading suspects in the half - century old mystery of the origin of the highest - energy cosmic particles in the universe were in galaxies called «active galactic nuclei,» which have a super-radiating core region around the central supermassive black hole.

Also, the associated gamma - ray emission coming from the galaxy clusters and intergalactic space matches the unexplained part of the diffuse high - energy gamma - ray background that is not associated with one particular type of active galactic nucleus.»

Some active galactic nuclei are accompanied by powerful relativistic jets.

«Our work demonstrates that the ultrahigh - energy cosmic rays escaping from active galactic nuclei and their environments such as galaxy clusters and groups can explain the ultrahigh - energy cosmic - ray spectrum and composition.

It may be the result of an active galactic nucleus, where energy is gushing from a supermassive black hole.

Possible culprits include the lingering remains of supernovae, the explosions that occur when massive stars run out of fuel and die; and active galactic nuclei, superheated galaxies with supermassive black holes at their centers that spew out energy at prodigious rates.

In addition to the bright and chaotic features, each merging galaxy of NGC 5256 contains an active galactic nucleus, where gas and other debris are fed into a hungry supermassive black hole.

NGC 6240 is an important object to investigate in order to understand the physical and evolutional relationship among the processes of galaxy merger, the action of a starburst, and the phenomenon of an active galactic nucleus.

In 2007 astronomers working at Auger traced some of the ultrahigh - energy cosmic rays to nearby active galactic nuclei, the turbulent centers of violent galaxies.

Although the origin of the gamma rays is still being investigated, their discovery suggests the flaring behaviour of Cygnus X-3 is an even better analogue to that of quasars and other types of flaring galaxies known as «active galactic nuclei» (AGN) than previously thought.

Observations by the NSF's Jansky Very Large Array, pictured here, show that a suspected fast radio burst afterglow is actually radio emission from an active galactic nucleus.

The emission instead originates from an active galactic nucleus that is powered by a supermassive black hole.

«There's a general consensus that the very brightest active galactic nuclei are the result of major mergers,» he says, «but for the run - of - the - mill AGNs, other processes might be more important.»

He is a specialist on active galactic nuclei, superbright galactic cores thought to be caused by giant black holes sucking in and heating up quantities of gas and dust.

Such an «active galactic nucleus» (AGN) presumably arises when ultrahot gas falls into a galaxy's central black hole, and common wisdom held that the matter is tipped into the black hole when galaxies collide.

Among the most luminous things in the universe are active galactic nuclei (AGN): gigantic black holes that can emit as much energy as 10 billion suns.

The central region of M77 is an «active galactic nucleus,» or AGN, which means that matter is vigorously falling toward the central supermassive black hole and emitting intense light.

Most of these so - called active galactic nuclei (AGN) have been found using ground - based optical telescopes, which are cheaper than space - borne x-ray instruments.

However, at high redshifts we require active, continuous accretion to infer the presence of the SMBHs, which often comes in the form of long - term accretion in active galactic nuclei.

ASTRO - H will also allow scientists to resolve questions about ultrafast outflows of gas from active galactic nuclei and whether mysterious emissions from certain galaxy clusters are evidence of dark matter annihilation.

The origin and cause of astrophysical neutrinos are unknown, though gamma ray bursts, active galactic nuclei and black holes are potential sources.