space forensics: death of a star sara mitchell jim lochner nasa goddard space flight center...
Post on 19-Dec-2015
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SPACE FORENSICS:Death of a Star
Sara MitchellJim Lochner
NASA Goddard Space Flight Center
Greenbelt, Maryland
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What’s a supernova?
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Can you spot the supernova?
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Supernova Timeline
• Earliest recorded supernova — 185 A.D. in China
• Famous historic supernovae in 1006, 1572, and 1604 A.D.
• First telescope built in 1608 by Hans Lippershey
• Multiwavelength observations of supernova remnants began in 1937
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Beginning the Investigation
What do we want to know ?
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Case File: Cassiopeia A
•Host Galaxy: Milky Way•Constellation: Cassiopeia•Galactic Coordinates: G111.7-2.1
•Distance: ~10,000 light years
•Discovery: 1947
Interesting facts:•Discovered by radio observation
•Strongest radio source in the sky beyond our solar system
Image: Chandra X-Ray Observatory August 19, 1999
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Crime Scene Photographs
VisibleX-Ray RadioInfrared
Hot gas
(50 million degrees)
Clumps of matter
(10,000 degrees)
Dust grains
(several hundred degrees)
Spiraling high energy
electrons
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Why Multiwavelength?
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Supernova “DNA”
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“Signature” Spectroscopy
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Looking for Signatures
All X-RayEnergies
Calcium
Silicon
Iron
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Case Closed?
•Have we answered all of our questions?
•Have we found new questions?•Where else can we find
answers?•What could we learn from
seeing a “live” supernova?
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Is Cas A a “cold case”?
Image: SN2005cs© 2005-2007 by R. Jay GaBanyhttp://www.cosmotography.com
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Is Cas A a “cold case”?
Image: SN2005apSloan Digital Sky Survey
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Larger Body of Evidence
Crab Nebula(from SN 1054)
Tycho’s SN(SN 1572)
Kepler’s SN(SN 1604)
SN 1987A
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Space Forensics: The Big Picture