Soft Gamma Repeaters
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Home > Art, Film & Photography > Soft Gamma Repeaters: Soft Gamma Repeater, Sgr 1806-20, Sgr 1900+14, Sgr 1627-41, Sgr J1550-5418, Sgr 0501+4516
Soft Gamma Repeaters: Soft Gamma Repeater, Sgr 1806-20, Sgr 1900+14, Sgr 1627-41, Sgr J1550-5418, Sgr 0501+4516

Soft Gamma Repeaters: Soft Gamma Repeater, Sgr 1806-20, Sgr 1900+14, Sgr 1627-41, Sgr J1550-5418, Sgr 0501+4516


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About the Book

Chapters: Soft Gamma Repeater, Sgr 1806-20, Sgr 1900+14, Sgr 1627-41, Sgr J1550-5418, Sgr 0501+4516. Source: Wikipedia. Pages: 24. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: SGR 1806-20 is a magnetar, a particular type of neutron star. It has been identified as a soft gamma repeater. SGR 1806-20 is located about 14.5 kiloparsecs (50,000 light-years) from Earth on the far side of our Milky Way galaxy in the constellation of Sagittarius. It has a diameter of no more than 20 kilometres (12 miles) and rotates on its axis every 7.5 seconds (30,000 km/h rotation speed at the surface). As of 2007, SGR 1806-20 is the most magnetic object ever perceived by humankind, with a magnetic field over 10 gauss (10 teslas) in intensity (compared to the Sun's 1-5 gauss). SGR 1806-20 has a magnetic field that is a quadrillion times stronger than that of the Earth. On December 27, 2004, the radiation from an explosion on the surface of SGR 1806-20 reached Earth. In terms of gamma rays the burst was brighter than a full moon and had an absolute magnitude of around 29. It was the brightest event known to have been sighted on this planet from an origin outside our solar system. The gamma rays struck the ionosphere and created more ionization which briefly expanded the ionosphere. The magnetar released more energy in one-tenth of a second (1.3x10 J) than our sun has released in 100,000 years (4x10 W x 3.2x10 s = 1.3x10 J). Such a burst is thought to be the largest explosion observed by humans in the galaxy since the SN 1604 supernova observed by Johannes Kepler in 1604. A similar blast within 3 parsecs (10 light years) of earth would destroy the ozone layer and would be similar to a 12 kt of TNT (50 TJ) nuclear blast at 7.5 km. The nearest known magnetar to earth is 1E 2259+586, 4 kiloparsecs (13,000 light y...More: http: //booksllc.net/?id=152552


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Product Details
  • ISBN-13: 9781158481330
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Soft Gamma Repeater, Sgr 1806-20, Sgr 1900+14, Sgr 1627-41, Sgr J1550-5418, Sgr 0501+4516
  • Width: 229 mm
  • ISBN-10: 1158481330
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 50 gr


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