Slika eksplozija supernove jedna do druge

Slika eksplozija supernove jedna do druge

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  • Pridružio: 18 Dec 2003
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Two supernovas in one galaxy explode one by one


Two supernovae (circled) on either side of galaxy NGC 1316's bright core resemble eyes and a nose in this visible-light image from NASA's Swift satellite. Another bright spot at far left is a star in our own galaxy (NASA photo)

BEIJING, Nov. 21 (Xinhuanet) -- A rare portrait that shows two supernovas exploded just five months apart in the same galaxy, called NGC 1316, has been made by NASA's Swift telescope, according to an article published on the website of New Scientist Space.

Large galaxies typically play host to three supernovas per century. Galaxy NGC 1316 has had two supernovas in less than five months, and a total of four supernovas in 26 years, as far back as the records go. This makes NGC 1316 the most prodigious known producer of supernovas.

The first supernova that is still visible on the "right" in the image was detected on June 19, 2006, and was named SN 2006dd. The second supernova, on the immediate "left" in the image, was detected on Nov. 5 and has been named SN 2006mr.

NGC 1316, a massive elliptical galaxy about 80 million light years way, has recently merged with a spiral galaxy. Mergers do indeed spawn supernovas by forcing the creation of new, massive stars, which quickly die and explode.

Yet all four supernovas in NGC 1316 appear to be Type Ia, a variety previously not associated with galaxy mergers and massive star formation. Scientists are intrigued and are investigating whether the high supernova rate is a coincidence or a result of the merger.

Swift was launched in November 2004 and was fully operational by January 2005. It carries three main instruments: the Burst Alert Telescope, the X-ray Telescope, and the Ultraviolet/Optical Telescope.

Swift's gamma-ray detector, the Burst Alert Telescope, provides the rapid initial location and was built primarily by the NASA Goddard Space Flight Center in Greenbelt and Los Alamos National Laboratory and constructed at GSFC.

Swift's X-Ray Telescope and UV/Optical Telescope were developed and built by international teams led by Penn State and drew heavily on each institution's experience with previous space missions. The X-ray Telescope resulted from Penn State's collaboration with the University of Leicester in England and the Brera Astronomical Observatory in Italy.

The Ultraviolet/Optical Telescope resulted from Penn State's collaboration with the Mullard Space Science Laboratory of the University College-London.

These three telescopes give Swift the ability to do almost immediate follow-up observations of most gamma-ray bursts because Swift can rotate so quickly to point toward the source of the gamma-ray signal. The spacecraft was built by General Dynamics.

http://news.xinhuanet.com/english/2006-11/21/content_5359090.htm



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