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SUMMARY:How Did Cassiopeia A Explode? - Martin Laming (US Naval Research L
 aboratory)
DTSTART:20240314T160000Z
DTEND:20240314T170000Z
UID:TALK209188@talks.cam.ac.uk
CONTACT:107123
DESCRIPTION:Cassiopeia A is the best-observed core-collapse supernova remn
 ant in our galaxy. Analyses of the 1 Million second Chandra Very Large Pro
 ject X-ray observation and the data from infrared spectroscopy by Spitzer 
 lead to a “complete” (within the limitations of the data quality) asse
 ssment of the elemental composition of the explosion ejecta\, comprising b
 oth the reverse shocked X-ray emitting plasma and the photoionized unshock
 ed ejecta emitting primarily in the infrared. This is the first time such 
 a detailed census of supernova ejecta has ever been accomplished. More rec
 ently\, Cassiopeia A has been observed with the James Webb Space Telescope
 . A first look suggests that these data corroborate and extend our previou
 s analysis.\nHard X-ray observations by NUSTAR reveal the mass and locatio
 n of the radioactive nucleus 44Ti and optical imaging reveals a natal kick
  imparted to the compact central object (presumed to be a neutron star)\, 
 anti-correlated with the 44Ti location\, as expected. However\, X-ray imag
 ing reveals almost “pure” Fe knots on the east limb\, presumably the a
 shes of alpha rich freeze out\, which do not correlate so well. All these 
 observables carry information about processes at the core of the supernova
  and allow us (and others) to speculate about the nature of the explosion\
 , in ways that complement conclusions drawn from the prompt observations o
 f supernovae.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy
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