Journal article

Asymmetries of Heavy Elements in the Young Supernova Remnant Cassiopeia A

Tyler Holland-Ashford, Laura A Lopez, Katie Auchettl



Supernova remnants (SNRs) offer the means to study supernovae (SNe) long after the original explosion and can provide a unique insight into the mechanism that governs these energetic events. In this work, we examine the morphologies of X-ray emission from different elements found in the youngest known core-collapse SNR in the Milky Way, Cassiopeia A. The heaviest elements exhibit the highest levels of asymmetry, which we relate to the burning process that created the elements and their proximity to the center of explosion. Our findings support recent model predictions that the material closest to the source of explosion will reflect the asymmetries inherent to the SN mechanism. Additionally,..

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University of Melbourne Researchers


Awarded by NSF Astronomy AMP; Astrophysics Grant

Awarded by National Aeronautics and Space Administration by the Chandra X-ray Center

Awarded by National Aeronautics Space Administration

Awarded by Danish National Research Foundation

Funding Acknowledgements

We thank the members of the supernova group in the astronomy department at The Ohio State University, especially Dr. Tuguldur Sukhbold, for their helpful discussions and feedback. We also thank Dr. Brian Grefenstette for sharing the NuSTAR data and for useful discussions. L.A.L. acknowledges support from the Sophie and Tycho Brahe Visiting Professorship at the Niels Bohr Institute. This work was supported through NSF Astronomy & Astrophysics Grant AST-1517021 and by the National Aeronautics and Space Administration through Chandra Award Number GRT00057814 issued by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. Katie Auchettl is supported by the Danish National Research Foundation (DNRF132).