Fermi


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Fermi

A unit of length equivalent to one-one quadrillionth of one meter.
References in periodicals archive ?
Those from Centaurus A, for example, may stretch 10 times longer than the Fermi bubbles, with strong evidence for shock waves and photons being kicked up to high energies by speedy particles.
In 1949, the Fermi telescope's namesake, physicist Enrico Fermi, suggested the highest-energy cosmic rays were accelerated in the magnetic fields of interstellar gas clouds.
The spacecraft began its mission known as GLAST (Gamma-ray Large Area Space Telescope) when it was launched in June 2008 and was later renamed in honor of famed physicist Enrico Fermi.
With these results, Fermi has excluded more candidates, has shown that dark matter can contribute to only a small part of the gamma-ray background beyond our galaxy, the Milky Way, and has produced strong limits for dark matter particles in the second-largest galaxy orbiting it," she added.
With this new batch of pulsars, Fermi now has detected more than 100, which is an exciting milestone when you consider that, before Fermi's launch in 2008, only seven of them were known to emit gamma rays," said Pablo Saz Parkinson, an astrophysicist at the Santa Cruz Institute for Particle Physics at the University of California Santa Cruz, and a co-author on two papers detailing the findings.
Had Fermi and VERITAS not found gammaray emissions from starburst galaxies, he notes, "it would have been back to the drawing board" for understanding the origin of cosmic rays.
Key words: band structure; dopants; electron density; Fermi energy; gallium antinomide; Raman measurements.
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Remarkably, LMC P3 is the most luminous such system known in gamma rays, X-rays, radio waves and visible light, and it's only the second one discovered with Fermi.
Now we have conclusive proof supernova remnants, long the prime suspects, really do accelerate cosmic rays to incredible speeds," said Elizabeth Hays, a member of the research team and Fermi deputy project scientist at NASA's Goddard Space Flight Center in Greenbelt, Md.
The bubbles seem to have sharp edges, perhaps marking expanding shock fronts from such an event, but the gamma-ray spectrum recorded by Fermi is again too "hard" (dominated by especially high-energy emission).
During two recent lightning storms, Fermi recorded gamma-ray emissions with an energy that could have been produced only by energetic positrons, the antimatter equivalent of electrons.