Sentences with phrase «of black hole accretion»

The resulting disk has a series of vibrational «modes,» rather like resonances in a tuning fork, that might be excited by small disturbances — think of a planet - forming stellar disk nudged by a passing star or of a black hole accretion disk in which material is falling into the center unevenly.

Not exact matches

The swirls within the wrap remind me greatly of elliptical orbits of planets, the theoretical shape of galaxies, and even the accretion disc of the black hole.

The researchers found that relatively cool accretion discs around young stars, whose inner edges can be several times the size of the Sun, show the same behaviour as the hot, violent accretion discs around planet - sized white dwarfs, city - sized black holes and supermassive black holes as large as the entire Solar system, supporting the universality of accretion physics.

The study, «Accretion - induced variability links young stellar objects, white dwarfs, and black holes», which is published in the journal Science Advances, shows how the «flickering» in the visible brightness of young stellar objects (YSOs)-- very young stars in the final stages of formation — is similar to the flickering seen from black holes or white dwarfs as they violently pull matter from their surroundings in a process known as aAccretion - induced variability links young stellar objects, white dwarfs, and black holes», which is published in the journal Science Advances, shows how the «flickering» in the visible brightness of young stellar objects (YSOs)-- very young stars in the final stages of formation — is similar to the flickering seen from black holes or white dwarfs as they violently pull matter from their surroundings in a process known as accretionaccretion.

Computer simulations suggest that when two black holes spiral towards each other on a collision course, much of the gas and dust in the spinning accretion disc surrounding each of them is ripped away by the gravity of the other.

Such counterparts are dependably seen in the wake of comparably energetic cosmic explosions, including both stellar - scale cataclysms — supernovae, magnetar flares, and gamma - ray bursts — and episodic or continuous accretion activity of the supermassive black holes that commonly lurk in the centers of galaxies.

The researchers modeled the resulting accretion disc — an elliptical disc of stellar debris swirling around the black hole — along with its probable speed, radius, and rate of infall, or speed at which material falls onto the black hole.

«In fact, the energy and timescale of the gamma - ray emission is a better match to some types of supernovae, or to some of the supermassive black hole accretion events that Swift has seen,» Fox said.

In this artist's rendering, a thick accretion disk has formed around a supermassive black hole following the tidal disruption of a star that wandered too close.

Forest thinks the machine is on the verge of mimicking astrophysical phenomena such as accretion disks of gas and dust swirling into a black hole.

He saw the black hole's event horizon, the point beyond which nothing can escape; and an accretion disk, the gathering of matter siphoned from nearby stars.

Maity was an author of the article, «Black hole spin dependence of general relativistic multi-transonic accretion close to the horizon,» which was published online last December in the journal New Astronomy and in print in the journal's May issue.

About half of the disrupted star moves in elliptical orbits around the black hole and forms an accretion disc which eventually shines brightly in optical and X-ray wavelengths.

For comparison, the event horizon of a black hole like this is about 13 times bigger than the sun, and the accretion disk formed by the disrupted star could extend to more than twice Earth's distance from the sun.

The idea that quasars are powered by the accretion of matter onto black holes was proposed within months after the discovery of quasars.

To excite the voorwerp's glow, the black hole and its surrounding accretion disk, the active galactic nucleus, or AGN, should have had the brightness of about 2.5 trillion suns; its radio emission, however, suggested the AGN emitted the equivalent of a relatively paltry 25,000 suns.

«To capture the effects of different black holes we used realistic simulations of accretion disks with near - identical initial setups.

Theorists speculate that so - called quasi-periodic oscillation was caused by bright blobs in the black hole's accretion disk, made up of gas that slowly spirals towards the hole.

«Our results are based on a realistic modelling of the accretion of gas onto the black holes, and of the radiation they emit, which is compatible with current astronomical observations.

Image from a simulation produced using the Blue Waters supercomputer demonstrates that relativistic jets follow along with the precession of the tilted accretion disk around the black hole.

«This includes theorists studying dark matter and the formation of black holes, astrophysicists modelling the subsequent accretion process, and astronomers working on radio and X-ray observations.»

«If there are many axion stars in the centres, we expect that some of them collide with the black hole accretion disc,» says Iwazaki.

To get a better handle on how much energy those photoionized atoms consume, researchers at Osaka University in Japan attempted to recreate conditions in the region of an accretion disk that would be nearest a black hole.

Her research involves the study of accretion flows and emission processes around neutron stars and black holes.

Their tendency would be to cluster near the centre of galaxies, making them more likely to pass near the supermassive black holes that sit there and run into the accretion discs of gas that surround them.

Its specialty will be time - domain spectroscopy — useful for observing accretion by galactic black holes, surveys of distant supernovae and even searches for extrasolar planets.

And if the iron atoms arefluorescing that brightly, it means something is wrong with thestandard model of black - hole accretion disks.

Alternatively, an explanation may lie in some kind of exotic phenomenon involving extreme accretion, or «feeding,» of a black hole.

The orbiting motion of the accretion disk can trace the «death spiral» of its matter as it falls into the darkness of what the astrophysicists measure to be a supermassive black hole.

In addition to accretion disks, black holes also have winds and incredibly bright jets erupting from them along their rotation axis, shooting out matter and radiation at nearly the speed of light.

The black holes that we can observe directly through their radiant emission are mostly in a configuration where gas swirls around the black hole in the form of an accretion disk and that accretion disk — most of the mass is going to be in an ionized form, and then some of that gas gets expelled from the environment around the black hole, while it is still outside the black hole, it gets squirted out in the form of an outflow, a wind like the solar wind and then [a] much faster, collimated outflow called a jet.

So if astronomers can understand the physics of the matter that is flowing into the black hole, they can use it to test the predictions of general relativity as never before — but only if the movement of the matter in the accretion disc can be completely understood.

We now know that «radio loud» quasars occur when a fraction of the matter in the accretion disk avoids the final fate of falling into the black hole and comes blasting back out into space in high - speed jets emitted from the poles of the black hole.

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.

The accretion disks around supermassive black holes (black holes with masses millions of times that of the Sun) are some of the brightest objects in the Universe.

There must be other mechanisms at play in the interactions between the inner and outer parts of the accretion disk surrounding the black hole.

There are two different black hole scenarios proposed to explain these objects: (1) they contain very «big» black holes that could be more than a thousand times more massive than the Sun (Note 1), or (2) they are relatively small black holes, «little monsters» with masses no more than a hundred times that of the Sun, that shine at luminosities exceeding theoretical limits for standard accretion (called «supercritical (or super-Eddington) accretion,» Note 2).

The most popular explanation of how jets form is that the fast - spinning accretion disk, which contains charged particles, will produce a powerful magnetic field that is in contact with the black hole.

After carefully examining several possibilities, the team concluded that huge amounts of gas are rapidly falling onto «little monster» black holes in each of these ULXs, which produces a dense disk wind flowing away from the supercritical accretion disk.

Formation of massive seed black holes via collisions and accretion.

Such «supercritical accretion» is thought to be a possible mechanism in the formation of supermassive black holes at galactic centers in very short time periods (which are observed very early in cosmic time).

The discovery is the first time scientists have been able to see both a disk of material falling into a black hole, known as an accretion disk, and a jet in a system of this kind.

Those would cluster near the centre of galaxies, making them more likely to pass through the accretion discs of supermassive black holes there, causing the bursts we detect.

Kip Thorne worked out the mathematics of what happens to the accretion disc, and found that the intense gravity warps the disc around the black hole, creating the spectacular halo that is one of the movie's visual highlights.

Researchers are keen to understand the feeding habits of black holes because such binges, called accretion events, have an enormous effect on their surroundings, shutting off galaxy growth by heating and expelling the gas needed to form new stars.

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.

The article Accretion - induced variability links young stellar objects, white dwarfs, and black holes has been published in the latest edition of the journal Science Advances.

Meanwhile, a correlation between the rate at which stars form in the central regions of galaxies and the amount of gas that falls into supermassive black holes (mass accretion rate) was known to exist, leading some scientists to suggest that the activity involved in star formation fuels the growth of black holes.

Using NASA's super-sensitive Chandra X-ray space telescope, a team of astronomers led by Q. Daniel Wang at the University of Massachusetts Amherst has solved a long - standing mystery about why most super massive black holes (SMBH) at the centers of galaxies have such a low accretion rate — that is, they swallow very little of the cosmic gases available and instead act as if they are on a severe diet.

Swirling disks of material — called accretion disks — may surround black holes, and jets of matter may arise from their vicinity.