Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of Fe-Ni Bubbles in Young Supernova Remnants   Observations of core-collapse supernovae (SNe) have revealed the presence of
extensive mixing of radioactive material in SN ejecta. The mixing of
radioactive material, mostly freshly synthesized Ni, is not complete, which
leads to a two-phase SN ejecta structure. The low-density phase consists of Fe
bubbles, created by the energy input from radioactive Co and Ni, surrounded by
compressed high-density metal-rich ejecta. We report on the theoretical
investigation of supernova remnant (SNR) dynamics with the two-phase SN ejecta.
We first present 3-dimensional hydrodynamic simulations of a single Fe bubble
immersed in an outer ejecta envelope, and compare the results with previous
work on shock-cloud interactions. We then consider randomly distributed Fe
bubbles with an average volume filling fraction of 1/2. We find that the
presence of Fe bubbles leads to vigorous turbulence and mixing of Fe with other
heavy elements and with the ambient normal-abundance gas. The turbulent energy
can be an order of magnitude larger than in the case of smooth ejecta. A
significant fraction of the shocked ejecta is found in narrow filaments and
clumps moving with radial velocities larger than the velocity of the forward
shock. Observational consequences of the two-phase ejecta on SNR X-ray spectra
and images are briefly mentioned.

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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: math-ph