Sentences with phrase «active black holes in»

As galaxies with active black holes in their cores provide a means of observing huge quantities of radiation being generated and its impact on galaxies, AGN have been used as a laboratory to study star formation in these tumultuous places.

But Alastair Edge at Durham University, UK, isn't convinced there are active black holes in the galaxies examined.

Not exact matches

There are other possible sources for the particles — for one, IceCube has already traced an especially high - energy neutrino to a single active black hole that may not be in a cluster (SN Online: 4/7/16).

In a recent paper published in The Astrophysical Journal, Boorman (and colleagues from the NuSTAR active galaxies science team) described how data from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) has been used to study the intrinsic behaviour of a «hidden» supermassive black hole in a galaxy nearby to our own — IC 3639 — some 175 million light years from Earth, relatively close by in cosmic termIn a recent paper published in The Astrophysical Journal, Boorman (and colleagues from the NuSTAR active galaxies science team) described how data from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) has been used to study the intrinsic behaviour of a «hidden» supermassive black hole in a galaxy nearby to our own — IC 3639 — some 175 million light years from Earth, relatively close by in cosmic termin The Astrophysical Journal, Boorman (and colleagues from the NuSTAR active galaxies science team) described how data from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) has been used to study the intrinsic behaviour of a «hidden» supermassive black hole in a galaxy nearby to our own — IC 3639 — some 175 million light years from Earth, relatively close by in cosmic termin a galaxy nearby to our own — IC 3639 — some 175 million light years from Earth, relatively close by in cosmic termin cosmic terms.

It's not understood what is causing the black holes to become newly active, because in most cases there is no evidence of collisions or mergers.

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.

Astronomer Fabrizio Nicastro of the Harvard - Smithsonian Center for Astrophysics in Cambridge, Massachusetts, and his colleagues monitored the galaxy Markarian 421, which contains a «blazar» — an active black hole that aims powerful jets of energy toward Earth.

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.

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.

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.

On Friday at a meeting of the Royal Astronomical Society in Glasgow, U. K., Bluck will report that the most active supermassive black holes release staggering amounts of radiation during their most energetic periods, which can last hundreds of millions of years — enough, he says, «to strip apart every massive galaxy in the universe at least 25 times over.»

Astronomers have observed tornadolike winds powered by a central active supermassive black hole, such as the one in this image, pervading a galaxy.

Bright spots in the map include the Crab Nebula, which hosts a radiation - spewing stellar corpse called a pulsar, and several blazars, violent active galaxies where colossal black holes accelerate particles to more than 99 % the speed of light.

In some active galactic nuclei, you have a black hole and accretion disk and the majority of the power is associated with these outflowing jets, far more than is associated with the radiant energy that is emitted by the accretion disk and the hot gas surrounding it.

«Black holes with ravenous appetites define Type I active galaxies: New research suggests that the central black holes in Type I and Type II active galaxies consume matter at different rates, upending popular theory.&rBlack holes with ravenous appetites define Type I active galaxies: New research suggests that the central black holes in Type I and Type II active galaxies consume matter at different rates, upending popular theory.&rblack holes in Type I and Type II active galaxies consume matter at different rates, upending popular theory.»

«The best part of this project for me was learning about active galactic nuclei and supermassive black holes on a level I never could have in either undergraduate or graduate classroom settings.»

In other words, according to Morris's theory, a temporarily active black hole would help create stars, and the stars would repay the favor by sending the black hole new dust before explosively burning themselves out.

Blazars periodically flare when the supermassive black holes in some active galaxies» cores fill with dust and gas, releasing massive amounts of energy.

We don't have a theory for it, but we know this happens in galaxies that have active centers, and most people believe these active centers involve black holes.

Quasars are believed to be powered by accretion of material onto supermassive black holes in the nuclei of distant galaxies, making these luminous versions of the general class of objects known as active galaxies.

Either way, there is little doubt that the future will have many more exciting discoveries in store on the subjects of black holes and active galaxies!

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.

Maunakea, Hawaii — Using the W. M. Keck Observatory in Hawaii, a group of astronomers led by Joseph Hennawi of the Max Planck Institute for Astronomy have discovered the first quadruple quasar: four rare active black holes situated in close proximity to one another.

The top candidates, the astronomers suggested, are a neutron star, possibly a highly - magnetic magnetar, surrounded by either material ejected by a supernova explosion or material ejected by a resulting pulsar, or an active nucleus in the galaxy, with radio emission coming from jets of material emitted from the region surrounding a supermassive black hole.

Hence, a normal galaxy may have had an active phase in the past, and if so would still have a massive black hole lurking in its center.

In these galaxies, stars continue to develop along the jets of active black holes, albeit at a moderate rate.

In some «active galaxies,» gas trapped by the black hole's gravity forms a hot accretion disk as it spirals down.

Most galaxies in the observable universe contain a supermassive black hole at their center, one that is either active and surrounded by an accretion disk of dust, gas and other debris, or is dormant — lurking at the center, patiently awaiting its next meal.

In active galaxies, material drawn toward the black hole is thought to form a disk of material that tightly orbits the black hole.

The GBT has joined Spektr - R in several observations of active galactic nuclei, the supermassive black holes lurking inside galaxies that are bright in radio waves.

«This cloud, about 25 light - years away from the black hole, represents a «missing link» that will help us understand the complex regions around the central black holes in active galaxies,» said Jose - Luis Gomez, the team leader.

Although the data is limited only to a small number of target objects, Figure 3 shows the ratio of HCN / HCO + and HCN / CS increases in galaxies that have a supermassive black hole in a more active state.

A number of similar black hole exploration methods have also been proposed in optical / infrared spectra so far, but one crucial problem is that emissions at these wavelengths are absorbed by interstellar dust particles although the more active black holes contain more dust particles.

The observation demonstrates a direct connection between a supermassive black hole and activity in the nucleus of an active galaxy.

This means conventional exploration methods have difficulty in finding a black hole during the most active stage of its evolution process.

«We want to understand why only a small fraction of supermassive black holes are active,» said Benedetta Vulcani, an astronomer from the University of Melbourne, in a statement.

«This strong link between ram pressure stripping and active black holes was not predicted and has never been reported before,» said team leader Bianca Poggianti from the INAF - Astronomical Observatory of Padova in Italy.

Indeed, GRBs appear to emit produce even more energy than supernovae or even quasars (which are energetically bright accretion disks and bi-polar jets around supermassive black holes that are most commonly found in the active nuclei of some distant galaxies and possibly even in the pre-galaxy period after the Big Bang).

Microquasars In far - distant quasars and active galaxies, millions or even billions of light - years away, the gravitational and magnetic energy of supermassive black holes is capable of accelerating «jets» of subatomic particles to speeds approaching that of light.

The mechanisms behind black hole accretion are poorly understood, but the researchers suggest that this example may just have been an «early bloomer» that had an extremely active youth, only to settle down as a «regular» supermassive black hole in a large elliptical galaxy.

The halos around quasars — the brightest and the most active objects in the universe, they are galaxies formed less than 2 billion years after the Big Bang; they have supermassive black holes in their centers and consume stars, gas, interstellar dust and other material at a very fast rate — are made of gas known as the intergalactic medium and extend for up to 300,000 light - years from the centers of the quasars.

The «active» part of the galaxy is the supermassive black hole in its core, which spews out strong jets of energetic particles that produce enormous lobes of radio emission.

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.

SDSS studies have probed the dark matter environments of quasars through clustering measurements, revealed populations of quasars whose central engines are hidden by obscuring dust, captured changes in quasar spectra that show clouds moving in the gravitational grip of the central black hole, and allowed a comprehensive census of the much fainter accreting black holes (active galactic nuclei, or AGN) in present - day galaxies.