Abstract
Observations of the supernova remnant Cassiopeia A offer an unprecedented look back at the centre of this explosion, and support the hypothesis that spatial asymmetry is key to explaining the event. See Letter p.339 Most simulations of stellar core collapse events indicate that the explosions are asymmetric, but the resulting shapes differ in the various models. Brian Grefenstette et al. analysed the distribution of radioactive titanium-44 in Cassiopeia A, a young core-collapse remnant, as a proxy for explosion asymmetry. They report a degree of non-uniform distribution in the unshocked interior of Cas A greater than that expected from a spherical explosion, yet not as pronounced as would follow a highly bipolar explosion. On the basis of these findings, the authors conclude that the type of explosion for the Cas A core-collapse explosion was part-way between the two extremes of asymmetry.
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