Sentences with phrase «of active galaxies»

Another type of active galaxy is the radio galaxy, which emits huge amounts of radio energy.

A map of the southern sky shows the correlation between sources of incoming cosmic rays (circles) and the locations of active galaxies (red dots).

The ideal background «lights» for such a study are quasars, which are very distant bright cores of active galaxies powered by black holes.

She has demonstrated that accretion disks in the center of active galaxies lie at random angles relative to their host galaxies.

«We're peering right down into the core of the nucleus of this active galaxy,» Readhead says.

Because the gas in the halo is dark, the team measured it by using the light from quasars, the very distant bright cores of active galaxies powered by black holes.

New observations with the National Science Foundation's Very Long Baseline Array (VLBA) indicate that the inner workings of active galaxies may be considerably more complex than astronomers have previously thought.

Still, he says, it's plausible that the team is seeing a real signal, all the more so because Auger has long seen similar clustering in the direction of active galaxy Centaurus A. «We have what you might you might call a warm spot,» he says.

The current model of active galaxies such as M87 posits that each one harbors at its center a black hole many millions or even billions of times more massive than our own sun, all packed into a space about the size of our solar system.

Known as Seyfert galaxies, these are another type of active galaxy with relatively low mass black holes residing at their centers.

In fact, strong X-ray emission is probably the single most unifying characteristic of all active galaxies.

The radio emission of the active galaxies was puzzling because it could not be attributed to a collection of stars and gas under normal conditions.

«We were lucky that we detected the event just 3 - 4 years after the decline started so we could begin monitoring campaigns to study details of the accretion physics of active galaxies that can not be studied otherwise,» Bernd Husemann, project leader at the Close AGN Reference Survey and the lead author of the second study, said in the statement.

With further study, we think we can determine just which way it is moving, and thus help answer the question of just how these gas clouds in the central regions of active galaxies are behaving.»

The particular type of active galaxy seen then simply depends on the angle the accretion disk and dust ring are to the line of sight.

A third type of active galaxy called BL Lacertae objects (BL Lac objects for short) are probably radio galaxies with their jets pointed right at us.

Also, galaxy mergers and collisions will keep the gas and stars in the central part of active galaxies sufficiently stirred up so some of that material will become part of the accretion disk.

The core of the active galaxy M87 is seen to have a disk of hot gas moving very quickly around the center.

There are four classifications of active galaxy, but the type we observe may depend more upon our viewing angle than structural differences.

Supermassive J0100 +2802 sits at the center of an active galaxy, called a quasar, 12.8 billion light - years away.

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

New observations with the National Science Foundation's Very Long Baseline Array indicate that the inner workings of active galaxies may be considerably more complex than astronomers have previously thought.

Likewise, for astronomers interested in the early universe, focusing on just the flashiest quasars — the luminous cores of active galaxies — might lead to skewed results.

For decades, astronomers have tried to pin down why two of the most common types of active galaxies, known as Type I and Type II galaxies, appear different when observed from Earth.

Jets, too, can be seen traveling at close to the speed of light from the center of active galaxies and stretching millions of light - years into space; in fact, the disk - wind theory was developed to explain these extragalactic jets.

Surprisingly, 85 % of the active galaxies were classified as not being strongly distorted, suggesting that they hadn't experienced major collisions or mergers in their recent past.

The effort paid off: Each team obtained good data on a quasar, a type of active galaxy, that was shining when the universe was about a billion years old, just as the fog was beginning to clear.

«Blazars are one type of active galaxy,» said Marco Ajello, a professor of physics and astronomy and Paliya's advisor.

To test this idea, astronomers have used the Hubble telescope not only to study the centers of active galaxies but also of normal galaxies.

Blazars appear to produce more gamma radiation than other types of active galaxies, but this may be because one of their jets is pointed toward Earth.

One type of active galaxy is the Seyfert galaxy, named after Carl Seyfert who was the first to discover the peculiar spectra of these types of galaxies.

Blazars are a type of active galaxy — about 1,000 have been cataloged [source: A Review of the Universe].