Sentences with phrase «from blazars»

Thus, measuring how much gamma rays of different energies are attenuated or weakened from blazars at different distances from Earth indirectly gives a measurement of how many EBL photons of different wavelengths exist along the line of sight from blazar to Earth over those different distances.

«It was unexpected — we have only seen that kind of gamma ray emission from blazars,» said Dieter Hartmann, a professor of physics and astronomy and co-author of the study.

When a high - energy gamma ray from a blazar strikes air molecules in the upper regions of Earth's atmosphere, it produces a cascade of charged subatomic particles.

This sequence shows plasma moving away from the blazar's core.

Not exact matches

In the second half of last year the blazar CTA 102, which is 7,600 million light years from Earth, brightened considerably, drawing the attention of all the astronomers who specialise in this kind of objects.

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.

Gamma rays emanate from the most powerful and mysterious phenomena in the universe — quasars, supernovae, and the black hole - powered infernos called blazars.

Partially dimmed x-rays (dips in graph) from a flaring blazar (right) reveal two filaments of hot, diffuse matter in the vast spaces between galaxies.

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.

Astronomers had already recorded intensity flare ups in the radio region which originated from events in the blazar.

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.

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.

The attached figure illustrates how energetic gamma rays (dashed lines) from a distant blazar strike photons of extragalactic background light (wavy lines) and produce pairs of electrons and positrons.

From these measurements, Dominguez et al. were able to calculate the blazars» original emitted, unattenuated gamma - ray brightnesses at different energies.

So, astrophysicists developed an ingenious work - around method: measuring the EBL indirectly through measuring the attenuation of — that is, the absorption of — very high energy gamma rays from distant blazars.

Taking advantage of the extremely sharp radio «vision» of the continent - wide VLBA, the scientists tracked individual features in the jets of three blazars at distances from Earth ranging from 7.3 to 9 billion light - years.

The discovery of five blazars from the universe's youth means there must be hundreds more similar objects, said astronomer Roopesh Ojha, with NASA's Goddard Space Flight Center in Greenbelt, Md..

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.