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Latest Gamma-ray astronomy Stories

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2010-02-11 07:20:00

Instruments scanning outer space for cataclysmic explosions called gamma-ray bursts are detecting intense flashes of gamma-ray energy right here in the friendly skies of Earth. These terrestrial gamma-ray flashes, or TGFs, blast through thunderstorms close to the altitude where commercial airliners fly. In fact, they could be too close for comfort. In a recent study,* scientists estimated that airline passengers could be exposed to 400 chest X-rays worth of radiation by being near the origin...

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2009-11-02 14:05:00

Nearby galaxies undergoing a furious pace of star formation also emit lots of gamma rays, say astronomers using NASA's Fermi Gamma-ray Space Telescope. Two so-called "starburst" galaxies, plus a satellite of our own Milky Way galaxy, represent a new category of gamma-ray-emitting objects detected both by Fermi and ground-based observatories. "Starburst galaxies have not been accessible in gamma rays before," said Fermi team member Seth Digel, a physicist at SLAC National Accelerator...

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2009-10-28 13:25:00

During its first year of operations, NASA's Fermi Gamma Ray Space Telescope mapped the extreme sky with unprecedented resolution and sensitivity. It captured more than 1,000 discrete sources of gamma rays -- the highest-energy form of light. Capping these achievements was a measurement that provided rare experimental evidence about the very structure of space and time, unified as space-time in Einstein's theories. "Physicists would like to replace Einstein's vision of gravity -- as expressed...

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2009-10-03 11:13:58

Quite a few distant galaxies turn out to be cosmic delivery rooms. Large numbers of massive stars are born in the hearts of these starburst galaxies, and later explode as supernovae. In the remnants they leave behind, particles are accelerated to very high energies. Astrophysicists have now used the H.E.S.S. telescopes to make detailed measurements of the gamma rays from the NGC 253 galaxy. As predicted, these high-energy rays originate from the region of maximum supernova activity close to...

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2009-09-09 11:45:00

Scientists at the Naval Research Laboratory (NRL) Space Science Division and a team of international researchers have positively identified cosmic sources of gamma-ray emissions through the discovery of 16 pulsating neutron stars. Using the Large Area Telescope (LAT), the primary instrument on NASA's Fermi Gamma-ray Space Telescope satellite, the discoveries were made by conducting blind frequency searches on the sparse photon data provided by the LAT. The photons had energies between 20...

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2009-04-24 13:35:00

The largest-ever gamma-ray telescope is set to collect its "first light" at an opening ceremony on Saturday. Located on the island of Palma, the Major Atmospheric Gamma-ray Imaging Cerenkov Magic II will replace its predecessor, the Magic telescope. When it was built, the first Magic telescope was the largest gamma-ray telescope in the world, until 2003, when the four-telescope High-energy Stereoscopic System (Hess) was unveiled. Now, Magic's successor will reclaim the title once more, but...

2009-04-23 13:07:10

An international team of astronomers has used a U.S. radio telescope to study the brightest galaxies that the Fermi Gamma-ray Space Telescope can see. Yuri Kovalev at the Max Planck Institute for Radio Astronomy in Germany said the study solidifies the link between an active galaxy's gamma-ray emissions and its powerful radio-emitting jets. Kovalev and colleagues used the world's largest radio telescope -- the National Science Foundation's Very Long Baseline Array -- a set of 10 radio...

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2009-03-19 09:50:00

An international team of astrophysicists using telescopes on the ground and in space have uncovered surprising changes in radiation emitted by an active galaxy. The picture that emerges from these first-ever simultaneous observations with optical, X-ray and new-generation gamma-ray telescopes is much more complex than scientists expected and challenges current theories of how the radiation is generated. The galaxy in question is PKS 2155-304, a type of object known as a "blazar." Like many...

2009-02-19 13:00:00

WASHINGTON, Feb. 19 /PRNewswire-USNewswire/ -- The first gamma-ray burst to be seen in high-resolution from NASA's Fermi Gamma-ray Space Telescope is one for the record books. The blast had the greatest total energy, the fastest motions and the highest-energy initial emissions ever seen. (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) "We were waiting for this one," said Peter Michelson, the principal investigator on Fermi's Large Area Telescope at Stanford University....

2009-02-02 09:36:00

GREENBELT, Md., Feb. 2 /PRNewswire-USNewswire/ -- Astrophysicist Dr. Neil Gehrels of NASA's Goddard Space Flight Center in Greenbelt, Md., has been awarded the Henry Draper Medal by the National Academy of Sciences, Washington. (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) The National Academy of Sciences (NAS) will honor 18 individuals in 2009 with awards recognizing extraordinary scientific achievements in the areas of biology, chemistry, geology, astronomy, social...


Latest Gamma-ray astronomy Reference Libraries

7_7ab115b117284658644e345b89f5ba712
2004-10-19 04:45:43

Gamma-Ray Astronomy -- Gamma-ray astronomy is the astronomical study of gamma rays. Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Feenberg and Primakoff in 1948, Hayakawa and Hutchinson in 1952, and, especially, Morrison in 1958 had led scientists to believe that a number of different processes which were occurring in the universe would result in gamma-ray emission. These...

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Word of the Day
mundungus
  • A stinking tobacco.
  • Offal; waste animal product; organic matter unfit for consumption.
This word comes from the Spanish 'mondongo,' tripe, entrails.