Gamma ray

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Gamma ray

A high-energy photon, emitted by radioactive substances.
References in periodicals archive ?
So far, it's unclear if they do: The Fermi Collaboration has reported zero gamma-ray detections from 25 nearby dwarfs, but other studies using Fermi data have reported tentative detections from two dwarf galaxies, Reticulum II and Tucana III.
The observations showed the team "the initial 'prompt' phase of gamma-ray bursts and the evolution of the large jets of matter and energy that form as a result of the burst," according to a statement released Wednesday by the University of Maryland.
Gamma-ray binaries are prized because the gamma-ray output changes significantly during each orbit and sometimes over longer time scales.
One day 3C 279 was just one of many active galaxies we see, and the next day it was the brightest thing in the gamma-ray sky," said Sara Cutini, a Fermi Large Area Telescope scientist at the Italian Space Agency's Science Data Center in Rome.
For the first time a connection between dramatic outbursts of high energy gamma-ray emission and their counterparts at many radio frequencies has been established for a large sample of galaxies.
Data from NASA's Fermi Gamma-ray Space Telescope indicate that most of the gamma rays emitted by a pulsar arise from far above the pulsar's surface.
If theorists re jigger equations describing the cosmic objects, gamma-ray bursts could still be in the lineup, scientists report in the April 19 Nature.
Gamma-ray spectra are well characterized for each isotope.
On September 15, 2008, a gamma-ray burst in the constellation Carina (which is best seen from the Southern Hemisphere) was recorded.
Topics of the 22 invited talks include high-energy neutrino astronomy, the origin of galactic cosmic rays, the highest-energy cosmic rays, cosmic rays and gamma radiation from clusters of galaxies, gamma-ray blazars, non-thermal x-ray emission from supernova remnants, gamma-ray line astronomy, and neutrino telescopes.
As measured by the American satellite, the burst's gamma-ray brightness appeared fairly typical of gamma-ray bursts in general.
As a gamma-ray astronomer, what I have found most interesting is that nearly every object discovered in gamma rays has been unexpected.