Sentences with phrase «blazars at»
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.
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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.
Not exact matches
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.
Francesco Massaro at the University of Turin in Italy and Raffaele D'Abrusco at the Harvard - Smithsonian Center for Astrophysics in Cambridge, Massachusetts, show for the first time that the mid-infrared colors of blazars in WISE data correlate to an equivalent measurement of their gamma - ray output.
Looking at a distant galaxy: the radio chart (left) shows the image of the blazar PKS 1830 - 211 distorted by the gravitational lens effect.
J1415 +1320 is what's known as a blazar, a bright galaxy with a gluttonous supermassive black hole at its center (SN: 3/4/17, p. 13).
«How do blazars behave at, say, radio frequencies?
From these measurements, Dominguez et al. were able to calculate the blazars» original emitted, unattenuated gamma - ray brightnesses at different energies.
«We can think of one blazar class as a gas - guzzling car and the other as an energy - efficient electric vehicle,» study lead researcher Marco Ajello, an astrophysicist at Clemson University in South Carolina, said in a statement.
Blazars are active galactic nuclei — energetic regions surrounding massive black holes at the centers of galaxies.
«This tells us that the physical processes at the cores of these galaxies, called blazars, are extremely energetic and are capable of propelling matter very close to the absolute cosmic speed limit,» said Glenn Piner of Whittier College in Whittier, California.