Stellar Explosion has Many Layers

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Stellar Explosion has Many Layers
Oct. 26 , 2006 http//www.universetoday.com

• Department of Physics
• National Tsing Hua University
• G.T. Chen
• 2006/11/06

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Cassiopeia A

• R.A. 23h 23m 26.7s
• Dec. 58º 49' 03.00"
• Distance 11000 light years
• It is known as a supernova remnant
• ? SNR 111.7-2.1
• Apparent Dimension 5 arc min
• 10 light years

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Cassiopeia A

• It is the youngest known supernova remnant in our
  Milky Way, and the strongest extrasolar radio
  source in the sky.
• Calculating its expansion back, astronomers have
  found that the supernova must have blown up
  around 1667
• The original star is about 15 to 20 times solar
  mass and was made up of concentric shells of
  elements

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News

• From Spitzers observations, They have found new
  bits of the onion layers that had not been seen
  before
• This tells us that the stars explosion was not
  chaotic enough
• Its possible that the star exploded in a uniform
  fashion, blowing its layers out in successive
  order. Then those layers should be preserved in
  the expanding debris

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News

• Spitzers infrared detectors were able to
  observed gases and dusts consisting of the
  middle-layer elements neon, oxygen and aluminum
• It seems that most of the stars original layers
  flew outward in successive order, but at
  different average speeds depending on where they
  started

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This artist's concept illustrates that massive
star before and after it blew up
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News

• Cassiopeia A is the ideal target for studying the
  anatomy of a supernova explosion

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References

• http//www.universetoday.com
• Oct. 26 , 2006
• http//www.spitzer.caltech.edu/spitzer
• http//chandra.harvard.edu/photo/0237

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gtgtThank youltlt
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• Infrared data from the Spitzer Space Telescope
  are colored red optical data from the Hubble
  Space Telescope are yellow and X-ray data from
  the Chandra X-ray Observatory are green and blue

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• Spitzer reveals warm dust in the outer shell with
  temperatures of about 10 0C , and Hubble sees the
  filamentary structures of warmer gases about
  10,000 0C . Chandra shows hot gases at about 10
  million 0C

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radio

• X-ray

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• optical

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Reference

• Infrared

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