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Mar. 27th, 2007 12:34 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
taibaScientists 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. The flash was brighter than anything ever detected from beyond our Solar System and lasted over a tenth of a second. NASA and European satellites and many radio telescopes detected the flash and its aftermath on December 27, 2004. Two science teams report about this event at a special press event today at NASA headquarters. A multitude of papers are planned for publication.
The scientists said the light came from a "giant flare" on the surface of an exotic neutron star, called a magnetar. The apparent magnitude was brighter than a full moon and all historical star explosions. The light was brightest in the gamma-ray energy range, far more energetic than visible light or X-rays and invisible to our eyes.
Such a close and powerful eruption raises the question of whether an even larger influx of gamma rays, disturbing the atmosphere, was responsible for one of the mass extinctions known to have occurred on Earth hundreds of millions of years ago. Also, if giant flares can be this powerful, then some gamma-ray bursts (thought to be very distant black-hole-forming star explosions) could actually be from neutron star eruptions in nearby galaxies.
"The next biggest flare ever seen from any soft gamma repeater was peanuts compared to this incredible December 27 event," said Gaensler. "Had this happened within 10 light years of us, it would have severely damaged our atmosphere. Fortunately, all the magnetars we know of are much farther away than this."
Кино:
http://www.nasa.gov/mpg/108531main_flashcam0001_NASA%20WebV_1.mpg
http://www.nasa.gov/mov/108741main_magnetar_360_270.mov
____________________________________________________________
По-русски: http://lenta.ru/news/2005/02/21/star/
http://www.nasa.gov/vision/universe/watchtheskies/swift_nsu_0205.html
http://hojja-nusreddin.livejournal.com/1254149.html
The scientists said the light came from a "giant flare" on the surface of an exotic neutron star, called a magnetar. The apparent magnitude was brighter than a full moon and all historical star explosions. The light was brightest in the gamma-ray energy range, far more energetic than visible light or X-rays and invisible to our eyes.
Such a close and powerful eruption raises the question of whether an even larger influx of gamma rays, disturbing the atmosphere, was responsible for one of the mass extinctions known to have occurred on Earth hundreds of millions of years ago. Also, if giant flares can be this powerful, then some gamma-ray bursts (thought to be very distant black-hole-forming star explosions) could actually be from neutron star eruptions in nearby galaxies.
"The next biggest flare ever seen from any soft gamma repeater was peanuts compared to this incredible December 27 event," said Gaensler. "Had this happened within 10 light years of us, it would have severely damaged our atmosphere. Fortunately, all the magnetars we know of are much farther away than this."
Кино:
http://www.nasa.gov/mpg/108531main_flashcam0001_NASA%20WebV_1.mpg
http://www.nasa.gov/mov/108741main_magnetar_360_270.mov
____________________________________________________________
По-русски: http://lenta.ru/news/2005/02/21/star/
http://www.nasa.gov/vision/universe/watchtheskies/swift_nsu_0205.html
http://hojja-nusreddin.livejournal.com/1254149.html
