The Origin and Evolution of the Nonthermal Emission in Cassiopeia A

Details The Origin and Evolution of the Nonthermal Emission in Cassiopeia A The Origin and Evolution of the Nonthermal Emission in Cassiopeia A

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713005p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #130.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Cassiopeia A is one of only a handful of Galactic supernova remnants to show variations in nonthermal emission on measureable timescales. With 10 years worth of Chandra observations of Cas A, I will show how the nonthermal emission has decreased by 1.5%/yr, or about twice as fast as the decline seen in the radio emission. On smaller scales, I will demonstrate that the nonthermal emission knots and filament are not uniformly distributed across the face of the remnant, with the smallest scale features localized along and interior of the so-called bright ring. This would seem to suggest that the observed short term variations are not occurring at the forward shock, but somewhere in the interior, possibly at the contact discontinuity.

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