Sentences with phrase «by black hole x-rays»

Not exact matches

Using 12 years of archival data from NASA's Chandra X-Ray Observatory, a team led by Columbia University astrophysicist Chuck Hailey has found a dozen potential black holes within a few light - years of the Milky Way's center, well within the gravitational reach of our galaxy's supermassive black hole.

Taken with the orbiting Chandra Observatory, it shows the hottest, most violent objects in the galaxy: black holes gobbling down matter, gas heated to millions of degrees by dense, whirling neutron stars, and the high - energy radiation from stars that have exploded, sending out vast amounts of material that slam into surrounding gas, creating shock waves that heat the gas tremendously, generating X-rays.

As early as 2021 it will be joined by the Einstein Probe, a wide - field x-ray sentinel for transient phenomena such as gamma ray bursts and the titanic collisions of neutron stars or black holes that generate gravitational waves.

THE black hole family has a middle child, if an otherwise unexplained source of fluctuating X-rays is anything to go by.

Observations made by NASA's Chandra X-ray Observatory reveal gas diving into four small black holes within a few light - years of the galaxy's core, where thousands of other hidden holes may also orbit.

The only way to explain the X-ray shortfall, says Narayan, is if the energy is being swallowed up by a black hole.

While no one can see a black hole by definition, an X-ray telescope can see the orbiting material around that black hole, which is so hot it emits high - energy radiation.

The X-ray source containing this force - fed black hole, known by its abbreviated name of XJ1500 +0154, is located in a small galaxy about 1.8 billion light years from Earth.

The X-ray data also indicates that radiation from material surrounding this black hole has consistently surpassed the so - called Eddington limit, defined by a balance between the outward pressure of radiation from the hot gas and the inward pull of the gravity of the black hole.

The skew toward high - energy x-rays indicates that the black holes were heavily shrouded by dust and gas, through which only the most energetic radiation could pass.

Star stuff shed by HDE226868 spirals inexorably into the black hole at such high speeds that it emits final X-ray yelps as if in protest.

An interdisciplinary team of UvA physicists and astronomers proposed to search for primordial black holes in our galaxy by studying the X-ray and radio emission that these objects would produce as they wander through the galaxy and accrete gas from the interstellar medium.

Launched in July by the space shuttle Columbia, Chandra can view X-rays from very hot objects such as quasars and the gas falling into black holes.

QPOs were first discovered near black holes (as X-rays) in 1985 by Michiel van der Klis (University of Amsterdam), who is a co-author of the new article.

A possible answer comes from a new model of the black hole's feeding behavior, presented by a team led by Roman Shcherbakov, an x-ray astronomer at Harvard University.

The star got too close to its galaxy's central black hole about 290 million years ago, and collisions among its torn - apart pieces caused an eruption of optical, ultraviolet and X-ray light that was first spotted by scientists in 2014.

Based on data taken by NASA's Chandra X-ray Observatory, the model takes into account how energy flows between two regions around the black hole — an inner core close to the boundary beyond which light can not escape (the event horizon) and an outer ring that extends far out and includes the massive young stars lurking near the black hole.

By gathering energetic X-rays, it will study the physics of black holes, the evolution of galaxy clusters, and the formation of heavy elements — crucial for life — in exploding stars.

A disk of gas and dust drawn in by the black hole pours x-rays and ultraviolet radiation outward, where they strike a cooler layer of material, the torus, making it glow in the infrared.

If the X-ray source was caused by a GRB triggered by the merger of neutron star with a black hole or another neutron star, then gravitational waves would also have been produced..

The idea that neutron stars can produce x-ray jets as powerful as those created by black holes is «a pretty big deal» that challenges some of the current models of the phenomena, says astrophysicist Rob Fender of the University of Southampton in the U.K..

If a star seems to disappear, the team will try to confirm the formation of a black hole by looking for X-rays emitted by stray bits of matter falling into the black hole, Kochanek says.

X-rays from hot gas in a cluster of galaxies (left) outline two «supercavities» cleared out by an eruption from a central black hole (artist's view, right).

By comparing differences in the X-ray spectra between Type I and Type II galaxies, the researchers concluded that, regardless of which way the galaxy faces Earth, the central black holes in Type I galaxies consume matter and emit energy much faster compared with the black holes at the center of Type II galaxies.

Portegies Zwart hopes to test his simulations by predicting which of the four YODECs in our galaxy is likely to host a midsize black hole, which could be detectable via a bright X-ray signal.

By contrast, such features have not been observed from «normal» black hole X-ray binaries in the Milky Way where sub-critical accretion takes place.

To avoid those problems, critics have noted that small black holes could appear very bright in x-rays by channeling all of their energy into narrow beams.

The patterns of x-rays recorded by XMM - Newton show that the radiation oscillates every 18 seconds, suggestive of a pulsating disk of matter around a large black hole.

Because it takes time for the X-rays to reach the cloud, some of them were still arriving and making it glow when it emitted the light Van Arkel saw, even though the black hole was by then quiet.

At the center of our galaxy, in the immediate vicinity of its supermassive black hole, is a region wracked by powerful tidal forces and bathed in intense ultraviolet light and X-ray radiation.

In the new study, Charles Hailey, an astrophysicist at Columbia University, and his colleagues scrutinized the past dozen years of data gathered by the Chandra X-ray Observatory, an orbiting craft whose instruments are designed to detect high - energy radiation emitted by the immensely hot material surrounding exploded stars and near black holes.

The new x-ray observations, presented by Yale University astronomer Kevin Schawinski, reveal that the quasar is no longer active, probably because the black hole ran out of food.

It is a Seyfert galaxy that is dominated by something known as an Active Galactic Nucleus — its core is thought to contain a supermassive black hole that is emitting huge amounts of radiation, pouring energetic X-rays out into the universe.

Instead, the X-ray data show the gas near the black hole likely originates from winds produced by a disk - shaped distribution of young massive stars.

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.

In most cases, a black hole is found by looking for X-rays coming from a hot disk of material swirling around it.

This was revealed through a key aspect of the simulation called radiative feedback, which accounted for the way X-rays emitted by the black hole affected distant gas.

Captured by the Chandra X-ray Observatory in 2013 an outburst 400X brighter is the highest energy event observed so far from our galaxy's central black hole.

Typically stellar mass black holes in the Milky Way have been found by detection of X-ray radiation from their accretion disks.

These studies which are based on spectral line observations of molecular gas suggest a new method of potentially discovering inactive isolated black holes that are undetected by traditional method such as X-ray observations.

«While X-rays from matter falling onto the first black holes hindered their further growth, that very same radiation may have later cleared the way for direct formation of supermassive black holes by suppressing star formation,» said Alvarez.

Figure 1 Composite image showing how powerful radio jets from the supermassive black hole at the center of a galaxy in the Phoenix Cluster inflated huge «bubbles» in the hot, ionized gas surrounding the galaxy (the cavities inside the blue region imaged by NASA's Chandra X-ray observatory).

By detecting gamma - and X-rays, astronomers can observe the most powerful phenomena in the Universe, such as black holes devouring matter and supernova explosions.

In 2005, astronomers announced that GRB 050709 and GRB 050509B may be have created by collisions involving two neutron stars (more from Chandra X-Ray Observatory) and ESO), but that the presence of a second flare by GRB 050724 was more likely to have been produced by a neutron star's merger with a black hole (ESO).

Recent gravitational - wave discoveries by LIGO, as well as recent progress in X-ray, gamma ray and radio observations, have opened an unprecedented observational window into black holes and neutron stars.

The astronomers also noticed that one side of the donor star was always brighter than the other because it was illuminated by X-rays coming from near the black hole.

According to the researchers, this pattern is the result of stellar debris colliding with itself (which produces bursts of optical and UV light), and heating up just before being swallowed by the black hole (which gives off X-ray flares).

Most X-rays are emitted by pockets of hot gases found between galaxies and near black holes.

Putting this all together, the results show that the X-ray flare from this black hole was caused by the ejected corona.

Using data from three of NASA's Great Observatories (the Hubble Space Telescope, Chandra X-ray Observatory, and Spitzer Space Telescope), scientists have found the best evidence to date that supermassive black holes in the early universe were produced by the direct collapse of a gas cloud.