Sentences with phrase «blazars by»

Observations of blazars by NASA's Fermi Gamma Ray Telescope spacecraft for the first time detected that gamma rays from distant blazars are indeed attenuated more than gamma rays from nearby blazars, a result announced on November 30, 2012, in a paper published in Science, as theoretically predicted.

«We found that when we plotted Fermi blazars by their WISE colors in a particular way, they occupied a distinctly different part of the plot than other extragalactic gamma - ray sources.»

Not exact matches

A blazar, a galaxy that kicks out fluctuating X-rays, might also have been responsible, but blazars are easily identified by their strong radio emissions, something not apparent in this source (Nature, DOI: 10.1038 / nature08083).

Black - hole - powered galaxies called blazars are the most common sources detected by NASA's Fermi Gamma - ray Space Telescope.

At the heart of a blazar lies a supersized black hole with millions of times the sun's mass surrounded by a disk of hot gas and dust.

The discovery, which was accomplished by comparing data from NASA's Wide - field Infrared Survey Explorer (WISE) and Fermi Gamma - ray Space Telescope, has enabled the researchers to uncover dozens of new blazar candidates.

They could have emerged from gamma - ray bursts, mysterious and short - lived cataclysms that briefly rank as the brightest objects in the universe; shock waves from exploding stars; or so - called blazars, jets of energy powered by supermassive black holes.

Fermi has shown that much of this light arises from unresolved gamma - ray sources, particularly galaxies called blazars, which are powered by material falling toward gigantic black holes.

Looking at a distant galaxy: the radio chart (left) shows the image of the blazar PKS 1830 - 211 distorted by the gravitational lens effect.

This behaviour and further findings from observations can be best explained with an interesting assumption: Although the brightness variations in the gamma ray region also originate from the flare ups in the blazar, they are amplified to different degrees by the gravitational lens effect of individual stars in the foreground galaxy.

Now, Readhead and his colleagues argue that they're seeing the blazar's black hole emit tiny burps of plasma, magnified hundreds of times by a new kind of gravitational lens.

Instead of streaming out of a metal casing and turbine, a blazar's jets «are confined and focused by coiled magnetic fields originating near the [supermassive] black hole.»

Not all the high - energy gamma rays emitted by a blazar, however, make it all the way across billions of light - years to Earth; some strike a hapless EBL photon along the way.

«Now, based on independent confirmation by two groups of astronomers, we see these three blazars with apparent speeds greater than 25 times that of light,» Piner added.

A Boston University team led by Svetlana Jorstad earlier had identified the three blazars as having potentially very high jet speeds based on VLBA observations in the mid-1990s.

Scientists think that Big Bird could have been produced by an ancient, super powerful galactic center called a «blazar» from 9.5 billion light - years away.