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Brightest Explosion Ever Observed Overwhelms Telescopes
Southampton, UK (SPX) Feb 18, 2005 Scientists have detected a flash of light from across the Galaxy so powerful that it bounced off the Moon and lit up the Earth's upper atmosphere. This "giant flare" was the brightest explosion ever detected from beyond the Solar System. For over a tenth of a second the remarkable flare was actually brighter than a full moon. NASA and European satellites and ground-based telescopes around the world detected the giant flare on 27 December 2004. Scientists from twenty institutes joined the observations. Two science teams report about this unprecedented event in a forthcoming issue of Nature. The light detected from the giant flare was far brighter in gamma rays than visible light or X-rays. It was probably created by an unprecedented eruption on the surface of an exotic neutron star which is classed both as an ultra-magnetic magnetar and as a soft gamma repeater (SGR). The designation of the neutron star that erupted is SGR 1806-20, about 50,000 light years from Earth in the constellation Sagittarius. A number of important questions arise from this discovery:
British astronomers have focused on studying the radio emission from the event, which was produced as the explosion ploughed into the surrounding matter at about 100,000 km per second, heating particles to extraordinary energies. Dr. Rob Fender of Southampton University is a co-author on a Nature paper describing the radio observations. "This is a once-in-a-lifetime event. We have observed an object only 20 kilometres across, on the other side of our Galaxy, releasing more energy in a tenth of a second than the Sun emits in 100,000 years," said Fender. "The next biggest flare ever seen from any soft gamma repeater was peanuts compared to this incredible December 27 event," said Dr. Bryan Gaensler of the Harvard-Smithsonian Center for Astrophysics, lead author on the Nature paper. "Had this happened within 10 light years of us, it would have severely damaged our atmosphere and possibly have triggered a mass extinction. Fortunately there are no magnetars anywhere near us." "These neutron stars have magnetic fields hundreds of times more powerful than any other objects in the universe. We may be seeing a massive release of magnetic energy during a 'starquake' on the surface of the object," added Dr.Maura McLaughlin of the University of Manchester, also a co-author on the Nature paper. Radio observations of the neutron star continue around the world, including the UK's Multi-Element Radio-Linked Interferometer Network (MERLIN) and the Joint Institute for VLBI in Europe.
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Sloan Survey Identifies New Dwarf Galaxy Inside Milky Way
Washington DC (SPX) Jan 10, 2006Astronomers using the Sloan Digital Sky Survey have discovered a previously unknown cluster of stars within the Milky Way that appears to be a separate dwarf galaxy being consumed by its much larger neighbor.
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