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Latest Fermi Gamma-ray Space Telescope Stories

INTEGRAL Deciphers Diffuse Signature Of Cosmic-ray Electrons
2011-12-22 04:22:00

Astronomers exploiting six years worth of data from ESA's INTEGRAL mission have pinned down the individual processes contributing to the high-energy Galactic interstellar emission produced by cosmic-ray electrons. Deciphering each of the different physical mechanisms at play at hard X-ray and soft gamma-ray wavelengths represents a crucial step towards an increasingly detailed picture of the population of high-energy particles permeating the Milky Way. Cosmic rays are highly-energetic...

Image 1 - Fermi Shows That Tycho's Star Shines In Gamma Rays
2011-12-13 11:56:08

[ Watch the Video ] In early November 1572, observers on Earth witnessed the appearance of a "new star" in the constellation Cassiopeia, an event now recognized as the brightest naked-eye supernova in more than 400 years. It's often called "Tycho's supernova" after the great Danish astronomer Tycho Brahe, who gained renown for his extensive study of the object. Now, years of data collected by NASA's Fermi Gamma-Ray Space Telescope reveal that the shattered star's remains shine in...

Image 1 - Fermi Finds Cosmic-ray Cocoon In The Heart Of Cygnus
2011-11-29 12:32:33

[ Watch the Video ] The constellation Cygnus, now visible in the western sky as twilight deepens after sunset, hosts one of our galaxy's richest-known stellar construction zones. Astronomers viewing the region at visible wavelengths see only hints of this spectacular activity thanks to a veil of nearby dust clouds forming the Great Rift, a dark lane that splits the Milky Way, a faint band of light marking our galaxy's central plane. Located in the vicinity of the second-magnitude star...

Physicists Set Strongest Limit On Mass Of Dark Matter
2011-11-25 04:21:29

Brown University physicists have set the strongest limit for the mass of dark matter, the mysterious particles believed to make up nearly a quarter of the universe. The researchers report in Physical Review Letters that dark matter must have a mass greater than 40 giga-electron volts. The distinction is important because it casts doubt on recent results from underground experiments that have reported detecting dark matter. If dark matter exists in the universe, scientists now have set the...

2011-11-03 13:21:00

WASHINGTON, Nov. 3, 2011 /PRNewswire-USNewswire/ -- An international team of scientists using NASA's Fermi Gamma-ray Space Telescope has discovered a surprisingly powerful millisecond pulsar that challenges existing theories about how these objects form. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) At the same time, another team has located nine new gamma-ray pulsars in Fermi data, using improved analytical techniques. A pulsar is a type of neutron star that emits...

Image 1 - Scientists Discover Powerful Millisecond Pulsar
2011-11-03 14:24:14

[ Video 1 ] | [ Video 2 ] | [ Video 3 ] NASA said on Thursday that its scientists have discovered a surprisingly powerful millisecond pulsar that challenges existing theories. The international team of scientists used NASA's Fermi Gamma-ray Space Telescope to find that the object is the most luminous pulsar detected in the galaxy cluster to date, spinning at 11,000 rotations per minute. The researchers wrote in the November 3 issue of the journal Science that the pulsar is only 25...

Image 1 - Gamma-ray Burst Reveals Surprising Ingredients Of Early Galaxies
2011-11-02 05:50:51

An international team of astronomers has used the brief but brilliant light of a distant gamma-ray burst as a probe to study the make-up of very distant galaxies. Surprisingly the new observations, made with ESO´s Very Large Telescope, have revealed two galaxies in the young Universe that are richer in the heavier chemical elements than the Sun. The two galaxies may be in the process of merging. Such events in the early Universe will drive the formation of many new stars and may be the...

2011-11-01 03:39:55

NASA will hold a media teleconference at 2 p.m. EDT on Thursday, Nov. 3, to discuss new discoveries about pulsars by the Fermi Gamma-ray Space Telescope. A pulsar is the closest thing to a black hole astronomers can observe directly. Pulsars are capable of crushing half a million times more mass than Earth into a sphere no larger than a city. Some of these objects spin tens of thousands of revolutions per minute, faster than the blades of a kitchen blender. Participants are: - Paulo...

spacepress-101811-005
2011-10-18 09:45:39

[ Watch the Video ] NASA's Fermi team recently released the second catalog of gamma-ray sources detected by their satellite's Large Area Telescope (LAT). Of the 1873 sources found, nearly 600 are complete mysteries. No one knows what they are. "Fermi sees gamma rays coming from directions in the sky where there are no obvious objects likely to produce gamma rays," says David Thompson, Fermi Deputy Project Scientist from Goddard Space Flight Center. Gamma rays are by their very nature...

Image 1 - Fermi Census Highlights Cosmic Mysteries
2011-09-11 04:32:43

  Every three hours, NASA's Fermi Gamma-ray Space Telescope scans the entire sky and deepens its portrait of the high-energy universe. Every year, the satellite's scientists reanalyze all of the data it has collected, exploiting updated analysis methods to tease out new sources. These relatively steady sources are in addition to the numerous transient events Fermi detects, such as gamma-ray bursts in the distant universe and flares from the sun. Earlier this year, the Fermi team...