仙后座A超新星遗迹中的钛和铁
Titanium and Iron in the Cassiopeia A Supernova Remnant
摘要：
原始中子星上方的混合被认为在超新星引擎中起着重要作用，这种混合导致了超新星爆炸的不对称性。在最里面的喷出物中产生的元素，例如，${}^{56}$ Ni和${}^{44}$ Ti提供了该发动机的清洁探头。${}^{44}$ Ti的产生对确切的产生途径特别敏感，通过了解可用的途径，我们可以使用${}^{44}$ Ti来探测超新星发动机。从一个三维超新星爆炸模型的热力学轨迹，我们审查这些元素的生产和结构预计形成的“对流引擎”的范式背后的超新星。我们比较我们的结果，最近的X射线和$γ$射线观测仙后座A超新星遗迹。
英文摘要：
Mixing above the proto-neutron star is believed to play an important role in the supernova engine, and this mixing results in a supernova explosion with asymmetries. Elements produced in the innermost ejecta, e.g., ${}^{56}$Ni and ${}^{44}$Ti, provide a clean probe of this engine. The production of ${}^{44}$Ti is particularly sensitive to the exact production pathway and, by understanding the available pathways, we can use ${}^{44}$Ti to probe the supernova engine. Using thermodynamic trajectories from a three-dimensional supernova explosion model, we review the production of these elements and the structures expected to form under the "convective-engine" paradigm behind supernovae. We compare our results to recent X-ray and $γ$-ray observations of the Cassiopeia A supernova remnant.
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