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Autopsy of the Supernova Remnant Cassiopeia A

Published online by Cambridge University Press:  29 January 2014

Dan Milisavljevic  and
Robert A. Fesen
Dan Milisavljevic
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, 02138 email: [email protected]
Robert A. Fesen
Affiliation:
6127 Wilder Lab, Dept. of Physics & Astronomy, Dartmouth College, Hanover, NH 03755 email: [email protected]
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Abstract

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Three-dimensional kinematic reconstructions of optically emitting ejecta in the young Galactic supernova remnant Cassiopeia A (Cas A) are discussed. The reconstructions encompass the remnant's faint outlying ejecta knots, including the exceptionally high-velocity NE and SW streams of debris often referred to as ‘jets’. The bulk of Cas A's ejecta are arranged in several circular rings with diameters between approximately 30″ (0.5 pc) and 2′ (2 pc). We suggest that similar large-scale ejecta rings may be a common phenomenon of young core-collapse remnants and may explain lumpy emission line profile substructure sometimes observed in spectra of extragalactic core-collapse supernovae years after explosion. A likely origin for these large ejecta rings is post-explosion input of energy from plumes of radioactive 56Ni-rich ejecta that rise, expand, and compress non-radioactive material to form bubble-like structures.

Keywords

supernova remnant
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 155 - 159
Copyright
Copyright © International Astronomical Union 2014 

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